mirror of https://github.com/python/cpython
679 lines
21 KiB
Python
679 lines
21 KiB
Python
import doctest
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import textwrap
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import types
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import unittest
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doctests = """
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########### Tests borrowed from or inspired by test_genexps.py ############
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Test simple loop with conditional
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>>> sum([i*i for i in range(100) if i&1 == 1])
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166650
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Test simple nesting
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>>> [(i,j) for i in range(3) for j in range(4)]
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[(0, 0), (0, 1), (0, 2), (0, 3), (1, 0), (1, 1), (1, 2), (1, 3), (2, 0), (2, 1), (2, 2), (2, 3)]
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Test nesting with the inner expression dependent on the outer
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>>> [(i,j) for i in range(4) for j in range(i)]
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[(1, 0), (2, 0), (2, 1), (3, 0), (3, 1), (3, 2)]
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Test the idiom for temporary variable assignment in comprehensions.
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>>> [j*j for i in range(4) for j in [i+1]]
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[1, 4, 9, 16]
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>>> [j*k for i in range(4) for j in [i+1] for k in [j+1]]
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[2, 6, 12, 20]
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>>> [j*k for i in range(4) for j, k in [(i+1, i+2)]]
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[2, 6, 12, 20]
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Not assignment
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>>> [i*i for i in [*range(4)]]
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[0, 1, 4, 9]
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>>> [i*i for i in (*range(4),)]
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[0, 1, 4, 9]
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Make sure the induction variable is not exposed
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>>> i = 20
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>>> sum([i*i for i in range(100)])
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328350
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>>> i
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20
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Verify that syntax error's are raised for listcomps used as lvalues
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>>> [y for y in (1,2)] = 10 # doctest: +IGNORE_EXCEPTION_DETAIL
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Traceback (most recent call last):
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...
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SyntaxError: ...
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>>> [y for y in (1,2)] += 10 # doctest: +IGNORE_EXCEPTION_DETAIL
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Traceback (most recent call last):
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...
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SyntaxError: ...
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########### Tests borrowed from or inspired by test_generators.py ############
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Make a nested list comprehension that acts like range()
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>>> def frange(n):
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... return [i for i in range(n)]
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>>> frange(10)
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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Same again, only as a lambda expression instead of a function definition
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>>> lrange = lambda n: [i for i in range(n)]
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>>> lrange(10)
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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Generators can call other generators:
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>>> def grange(n):
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... for x in [i for i in range(n)]:
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... yield x
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>>> list(grange(5))
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[0, 1, 2, 3, 4]
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Make sure that None is a valid return value
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>>> [None for i in range(10)]
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[None, None, None, None, None, None, None, None, None, None]
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"""
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class ListComprehensionTest(unittest.TestCase):
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def _check_in_scopes(self, code, outputs=None, ns=None, scopes=None, raises=(),
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exec_func=exec):
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code = textwrap.dedent(code)
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scopes = scopes or ["module", "class", "function"]
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for scope in scopes:
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with self.subTest(scope=scope):
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if scope == "class":
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newcode = textwrap.dedent("""
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class _C:
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{code}
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""").format(code=textwrap.indent(code, " "))
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def get_output(moddict, name):
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return getattr(moddict["_C"], name)
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elif scope == "function":
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newcode = textwrap.dedent("""
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def _f():
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{code}
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return locals()
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_out = _f()
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""").format(code=textwrap.indent(code, " "))
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def get_output(moddict, name):
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return moddict["_out"][name]
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else:
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newcode = code
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def get_output(moddict, name):
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return moddict[name]
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newns = ns.copy() if ns else {}
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try:
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exec_func(newcode, newns)
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except raises as e:
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# We care about e.g. NameError vs UnboundLocalError
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self.assertIs(type(e), raises)
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else:
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for k, v in (outputs or {}).items():
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self.assertEqual(get_output(newns, k), v, k)
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def test_lambdas_with_iteration_var_as_default(self):
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code = """
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items = [(lambda i=i: i) for i in range(5)]
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y = [x() for x in items]
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"""
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outputs = {"y": [0, 1, 2, 3, 4]}
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self._check_in_scopes(code, outputs)
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def test_lambdas_with_free_var(self):
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code = """
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items = [(lambda: i) for i in range(5)]
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y = [x() for x in items]
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"""
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outputs = {"y": [4, 4, 4, 4, 4]}
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self._check_in_scopes(code, outputs)
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def test_class_scope_free_var_with_class_cell(self):
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class C:
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def method(self):
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super()
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return __class__
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items = [(lambda: i) for i in range(5)]
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y = [x() for x in items]
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self.assertEqual(C.y, [4, 4, 4, 4, 4])
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self.assertIs(C().method(), C)
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def test_references_super(self):
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code = """
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res = [super for x in [1]]
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"""
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self._check_in_scopes(code, outputs={"res": [super]})
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def test_references___class__(self):
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code = """
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res = [__class__ for x in [1]]
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"""
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self._check_in_scopes(code, raises=NameError)
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def test_inner_cell_shadows_outer(self):
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code = """
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items = [(lambda: i) for i in range(5)]
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i = 20
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y = [x() for x in items]
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"""
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outputs = {"y": [4, 4, 4, 4, 4], "i": 20}
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self._check_in_scopes(code, outputs)
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def test_inner_cell_shadows_outer_no_store(self):
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code = """
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def f(x):
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return [lambda: x for x in range(x)], x
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fns, x = f(2)
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y = [fn() for fn in fns]
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"""
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outputs = {"y": [1, 1], "x": 2}
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self._check_in_scopes(code, outputs)
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def test_closure_can_jump_over_comp_scope(self):
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code = """
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items = [(lambda: y) for i in range(5)]
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y = 2
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z = [x() for x in items]
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"""
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outputs = {"z": [2, 2, 2, 2, 2]}
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self._check_in_scopes(code, outputs, scopes=["module", "function"])
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def test_cell_inner_free_outer(self):
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code = """
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def f():
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return [lambda: x for x in (x, [1])[1]]
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x = ...
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y = [fn() for fn in f()]
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"""
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outputs = {"y": [1]}
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self._check_in_scopes(code, outputs, scopes=["module", "function"])
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def test_free_inner_cell_outer(self):
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code = """
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g = 2
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def f():
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return g
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y = [g for x in [1]]
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"""
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outputs = {"y": [2]}
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self._check_in_scopes(code, outputs, scopes=["module", "function"])
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self._check_in_scopes(code, scopes=["class"], raises=NameError)
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def test_inner_cell_shadows_outer_redefined(self):
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code = """
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y = 10
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items = [(lambda: y) for y in range(5)]
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x = y
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y = 20
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out = [z() for z in items]
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"""
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outputs = {"x": 10, "out": [4, 4, 4, 4, 4]}
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self._check_in_scopes(code, outputs)
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def test_shadows_outer_cell(self):
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code = """
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def inner():
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return g
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[g for g in range(5)]
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x = inner()
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"""
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outputs = {"x": -1}
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self._check_in_scopes(code, outputs, ns={"g": -1})
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def test_explicit_global(self):
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code = """
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global g
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x = g
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g = 2
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items = [g for g in [1]]
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y = g
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"""
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outputs = {"x": 1, "y": 2, "items": [1]}
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self._check_in_scopes(code, outputs, ns={"g": 1})
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def test_explicit_global_2(self):
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code = """
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global g
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x = g
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g = 2
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items = [g for x in [1]]
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y = g
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"""
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outputs = {"x": 1, "y": 2, "items": [2]}
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self._check_in_scopes(code, outputs, ns={"g": 1})
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def test_explicit_global_3(self):
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code = """
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global g
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fns = [lambda: g for g in [2]]
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items = [fn() for fn in fns]
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"""
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outputs = {"items": [2]}
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self._check_in_scopes(code, outputs, ns={"g": 1})
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def test_assignment_expression(self):
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code = """
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x = -1
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items = [(x:=y) for y in range(3)]
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"""
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outputs = {"x": 2}
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# assignment expression in comprehension is disallowed in class scope
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self._check_in_scopes(code, outputs, scopes=["module", "function"])
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def test_free_var_in_comp_child(self):
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code = """
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lst = range(3)
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funcs = [lambda: x for x in lst]
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inc = [x + 1 for x in lst]
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[x for x in inc]
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x = funcs[0]()
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"""
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outputs = {"x": 2}
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self._check_in_scopes(code, outputs)
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def test_shadow_with_free_and_local(self):
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code = """
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lst = range(3)
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x = -1
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funcs = [lambda: x for x in lst]
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items = [x + 1 for x in lst]
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"""
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outputs = {"x": -1}
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self._check_in_scopes(code, outputs)
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def test_shadow_comp_iterable_name(self):
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code = """
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x = [1]
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y = [x for x in x]
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"""
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outputs = {"x": [1]}
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self._check_in_scopes(code, outputs)
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def test_nested_free(self):
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code = """
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x = 1
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def g():
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[x for x in range(3)]
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return x
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g()
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"""
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outputs = {"x": 1}
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self._check_in_scopes(code, outputs, scopes=["module", "function"])
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def test_introspecting_frame_locals(self):
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code = """
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import sys
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[i for i in range(2)]
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i = 20
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sys._getframe().f_locals
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"""
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outputs = {"i": 20}
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self._check_in_scopes(code, outputs)
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def test_nested(self):
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code = """
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l = [2, 3]
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y = [[x ** 2 for x in range(x)] for x in l]
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"""
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outputs = {"y": [[0, 1], [0, 1, 4]]}
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self._check_in_scopes(code, outputs)
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def test_nested_2(self):
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code = """
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l = [1, 2, 3]
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x = 3
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y = [x for [x ** x for x in range(x)][x - 1] in l]
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"""
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outputs = {"y": [3, 3, 3]}
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self._check_in_scopes(code, outputs, scopes=["module", "function"])
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self._check_in_scopes(code, scopes=["class"], raises=NameError)
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def test_nested_3(self):
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code = """
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l = [(1, 2), (3, 4), (5, 6)]
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y = [x for (x, [x ** x for x in range(x)][x - 1]) in l]
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"""
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outputs = {"y": [1, 3, 5]}
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self._check_in_scopes(code, outputs)
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def test_nested_4(self):
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code = """
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items = [([lambda: x for x in range(2)], lambda: x) for x in range(3)]
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out = [([fn() for fn in fns], fn()) for fns, fn in items]
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"""
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outputs = {"out": [([1, 1], 2), ([1, 1], 2), ([1, 1], 2)]}
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self._check_in_scopes(code, outputs)
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def test_nameerror(self):
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code = """
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[x for x in [1]]
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x
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"""
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self._check_in_scopes(code, raises=NameError)
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def test_dunder_name(self):
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code = """
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y = [__x for __x in [1]]
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"""
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outputs = {"y": [1]}
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self._check_in_scopes(code, outputs)
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def test_unbound_local_after_comprehension(self):
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def f():
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if False:
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x = 0
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[x for x in [1]]
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return x
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with self.assertRaises(UnboundLocalError):
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f()
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def test_unbound_local_inside_comprehension(self):
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def f():
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l = [None]
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return [1 for (l[0], l) in [[1, 2]]]
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with self.assertRaises(UnboundLocalError):
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f()
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def test_global_outside_cellvar_inside_plus_freevar(self):
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code = """
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a = 1
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def f():
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func, = [(lambda: b) for b in [a]]
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return b, func()
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x = f()
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"""
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self._check_in_scopes(
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code, {"x": (2, 1)}, ns={"b": 2}, scopes=["function", "module"])
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# inside a class, the `a = 1` assignment is not visible
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self._check_in_scopes(code, raises=NameError, scopes=["class"])
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def test_cell_in_nested_comprehension(self):
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code = """
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a = 1
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def f():
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(func, inner_b), = [[lambda: b for b in c] + [b] for c in [[a]]]
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return b, inner_b, func()
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x = f()
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"""
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self._check_in_scopes(
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code, {"x": (2, 2, 1)}, ns={"b": 2}, scopes=["function", "module"])
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# inside a class, the `a = 1` assignment is not visible
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self._check_in_scopes(code, raises=NameError, scopes=["class"])
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def test_name_error_in_class_scope(self):
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code = """
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y = 1
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[x + y for x in range(2)]
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"""
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self._check_in_scopes(code, raises=NameError, scopes=["class"])
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def test_global_in_class_scope(self):
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code = """
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y = 2
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vals = [(x, y) for x in range(2)]
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"""
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outputs = {"vals": [(0, 1), (1, 1)]}
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self._check_in_scopes(code, outputs, ns={"y": 1}, scopes=["class"])
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def test_in_class_scope_inside_function_1(self):
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code = """
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class C:
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y = 2
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vals = [(x, y) for x in range(2)]
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vals = C.vals
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"""
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outputs = {"vals": [(0, 1), (1, 1)]}
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self._check_in_scopes(code, outputs, ns={"y": 1}, scopes=["function"])
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def test_in_class_scope_inside_function_2(self):
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code = """
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y = 1
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class C:
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y = 2
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vals = [(x, y) for x in range(2)]
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vals = C.vals
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"""
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outputs = {"vals": [(0, 1), (1, 1)]}
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self._check_in_scopes(code, outputs, scopes=["function"])
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def test_in_class_scope_with_global(self):
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code = """
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y = 1
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class C:
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global y
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y = 2
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# Ensure the listcomp uses the global, not the value in the
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# class namespace
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locals()['y'] = 3
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vals = [(x, y) for x in range(2)]
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vals = C.vals
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"""
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outputs = {"vals": [(0, 2), (1, 2)]}
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self._check_in_scopes(code, outputs, scopes=["module", "class"])
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outputs = {"vals": [(0, 1), (1, 1)]}
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self._check_in_scopes(code, outputs, scopes=["function"])
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def test_in_class_scope_with_nonlocal(self):
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code = """
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y = 1
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class C:
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nonlocal y
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y = 2
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# Ensure the listcomp uses the global, not the value in the
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# class namespace
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locals()['y'] = 3
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vals = [(x, y) for x in range(2)]
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vals = C.vals
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"""
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outputs = {"vals": [(0, 2), (1, 2)]}
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self._check_in_scopes(code, outputs, scopes=["function"])
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def test_nested_has_free_var(self):
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code = """
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items = [a for a in [1] if [a for _ in [0]]]
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"""
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outputs = {"items": [1]}
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self._check_in_scopes(code, outputs, scopes=["class"])
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def test_nested_free_var_not_bound_in_outer_comp(self):
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code = """
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z = 1
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items = [a for a in [1] if [x for x in [1] if z]]
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"""
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self._check_in_scopes(code, {"items": [1]}, scopes=["module", "function"])
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self._check_in_scopes(code, {"items": []}, ns={"z": 0}, scopes=["class"])
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def test_nested_free_var_in_iter(self):
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code = """
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items = [_C for _C in [1] for [0, 1][[x for x in [1] if _C][0]] in [2]]
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"""
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self._check_in_scopes(code, {"items": [1]})
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def test_nested_free_var_in_expr(self):
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code = """
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items = [(_C, [x for x in [1] if _C]) for _C in [0, 1]]
|
|
"""
|
|
self._check_in_scopes(code, {"items": [(0, []), (1, [1])]})
|
|
|
|
def test_nested_listcomp_in_lambda(self):
|
|
code = """
|
|
f = [(z, lambda y: [(x, y, z) for x in [3]]) for z in [1]]
|
|
(z, func), = f
|
|
out = func(2)
|
|
"""
|
|
self._check_in_scopes(code, {"z": 1, "out": [(3, 2, 1)]})
|
|
|
|
def test_lambda_in_iter(self):
|
|
code = """
|
|
(func, c), = [(a, b) for b in [1] for a in [lambda : a]]
|
|
d = func()
|
|
assert d is func
|
|
# must use "a" in this scope
|
|
e = a if False else None
|
|
"""
|
|
self._check_in_scopes(code, {"c": 1, "e": None})
|
|
|
|
def test_assign_to_comp_iter_var_in_outer_function(self):
|
|
code = """
|
|
a = [1 for a in [0]]
|
|
"""
|
|
self._check_in_scopes(code, {"a": [1]}, scopes=["function"])
|
|
|
|
def test_no_leakage_to_locals(self):
|
|
code = """
|
|
def b():
|
|
[a for b in [1] for _ in []]
|
|
return b, locals()
|
|
r, s = b()
|
|
x = r is b
|
|
y = list(s.keys())
|
|
"""
|
|
self._check_in_scopes(code, {"x": True, "y": []}, scopes=["module"])
|
|
self._check_in_scopes(code, {"x": True, "y": ["b"]}, scopes=["function"])
|
|
self._check_in_scopes(code, raises=NameError, scopes=["class"])
|
|
|
|
def test_iter_var_available_in_locals(self):
|
|
code = """
|
|
l = [1, 2]
|
|
y = 0
|
|
items = [locals()["x"] for x in l]
|
|
items2 = [vars()["x"] for x in l]
|
|
items3 = [("x" in dir()) for x in l]
|
|
items4 = [eval("x") for x in l]
|
|
# x is available, and does not overwrite y
|
|
[exec("y = x") for x in l]
|
|
"""
|
|
self._check_in_scopes(
|
|
code,
|
|
{
|
|
"items": [1, 2],
|
|
"items2": [1, 2],
|
|
"items3": [True, True],
|
|
"items4": [1, 2],
|
|
"y": 0
|
|
}
|
|
)
|
|
|
|
def test_comp_in_try_except(self):
|
|
template = """
|
|
value = ["ab"]
|
|
result = snapshot = None
|
|
try:
|
|
result = [{func}(value) for value in value]
|
|
except:
|
|
snapshot = value
|
|
raise
|
|
"""
|
|
# No exception.
|
|
code = template.format(func='len')
|
|
self._check_in_scopes(code, {"value": ["ab"], "result": [2], "snapshot": None})
|
|
# Handles exception.
|
|
code = template.format(func='int')
|
|
self._check_in_scopes(code, {"value": ["ab"], "result": None, "snapshot": ["ab"]},
|
|
raises=ValueError)
|
|
|
|
def test_comp_in_try_finally(self):
|
|
template = """
|
|
value = ["ab"]
|
|
result = snapshot = None
|
|
try:
|
|
result = [{func}(value) for value in value]
|
|
finally:
|
|
snapshot = value
|
|
"""
|
|
# No exception.
|
|
code = template.format(func='len')
|
|
self._check_in_scopes(code, {"value": ["ab"], "result": [2], "snapshot": ["ab"]})
|
|
# Handles exception.
|
|
code = template.format(func='int')
|
|
self._check_in_scopes(code, {"value": ["ab"], "result": None, "snapshot": ["ab"]},
|
|
raises=ValueError)
|
|
|
|
def test_exception_in_post_comp_call(self):
|
|
code = """
|
|
value = [1, None]
|
|
try:
|
|
[v for v in value].sort()
|
|
except:
|
|
pass
|
|
"""
|
|
self._check_in_scopes(code, {"value": [1, None]})
|
|
|
|
def test_frame_locals(self):
|
|
code = """
|
|
val = [sys._getframe().f_locals for a in [0]][0]["a"]
|
|
"""
|
|
import sys
|
|
self._check_in_scopes(code, {"val": 0}, ns={"sys": sys})
|
|
|
|
def _recursive_replace(self, maybe_code):
|
|
if not isinstance(maybe_code, types.CodeType):
|
|
return maybe_code
|
|
return maybe_code.replace(co_consts=tuple(
|
|
self._recursive_replace(c) for c in maybe_code.co_consts
|
|
))
|
|
|
|
def _replacing_exec(self, code_string, ns):
|
|
co = compile(code_string, "<string>", "exec")
|
|
co = self._recursive_replace(co)
|
|
exec(co, ns)
|
|
|
|
def test_code_replace(self):
|
|
code = """
|
|
x = 3
|
|
[x for x in (1, 2)]
|
|
dir()
|
|
y = [x]
|
|
"""
|
|
self._check_in_scopes(code, {"y": [3], "x": 3})
|
|
self._check_in_scopes(code, {"y": [3], "x": 3}, exec_func=self._replacing_exec)
|
|
|
|
def test_code_replace_extended_arg(self):
|
|
num_names = 300
|
|
assignments = "; ".join(f"x{i} = {i}" for i in range(num_names))
|
|
name_list = ", ".join(f"x{i}" for i in range(num_names))
|
|
expected = {
|
|
"y": list(range(num_names)),
|
|
**{f"x{i}": i for i in range(num_names)}
|
|
}
|
|
code = f"""
|
|
{assignments}
|
|
[({name_list}) for {name_list} in (range(300),)]
|
|
dir()
|
|
y = [{name_list}]
|
|
"""
|
|
self._check_in_scopes(code, expected)
|
|
self._check_in_scopes(code, expected, exec_func=self._replacing_exec)
|
|
|
|
|
|
__test__ = {'doctests' : doctests}
|
|
|
|
def load_tests(loader, tests, pattern):
|
|
tests.addTest(doctest.DocTestSuite())
|
|
return tests
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|