mirror of https://github.com/python/cpython
444 lines
16 KiB
Python
444 lines
16 KiB
Python
# Test various flavors of legal and illegal future statements
|
|
|
|
import __future__
|
|
import ast
|
|
import unittest
|
|
from test import support
|
|
from test.support import import_helper
|
|
from textwrap import dedent
|
|
import os
|
|
import re
|
|
import sys
|
|
|
|
rx = re.compile(r'\((\S+).py, line (\d+)')
|
|
|
|
def get_error_location(msg):
|
|
mo = rx.search(str(msg))
|
|
return mo.group(1, 2)
|
|
|
|
class FutureTest(unittest.TestCase):
|
|
|
|
def check_syntax_error(self, err, basename, lineno, offset=1):
|
|
self.assertIn('%s.py, line %d' % (basename, lineno), str(err))
|
|
self.assertEqual(os.path.basename(err.filename), basename + '.py')
|
|
self.assertEqual(err.lineno, lineno)
|
|
self.assertEqual(err.offset, offset)
|
|
|
|
def test_future1(self):
|
|
with import_helper.CleanImport('future_test1'):
|
|
from test import future_test1
|
|
self.assertEqual(future_test1.result, 6)
|
|
|
|
def test_future2(self):
|
|
with import_helper.CleanImport('future_test2'):
|
|
from test import future_test2
|
|
self.assertEqual(future_test2.result, 6)
|
|
|
|
def test_future3(self):
|
|
with import_helper.CleanImport('test_future3'):
|
|
from test import test_future3
|
|
|
|
def test_badfuture3(self):
|
|
with self.assertRaises(SyntaxError) as cm:
|
|
from test import badsyntax_future3
|
|
self.check_syntax_error(cm.exception, "badsyntax_future3", 3)
|
|
|
|
def test_badfuture4(self):
|
|
with self.assertRaises(SyntaxError) as cm:
|
|
from test import badsyntax_future4
|
|
self.check_syntax_error(cm.exception, "badsyntax_future4", 3)
|
|
|
|
def test_badfuture5(self):
|
|
with self.assertRaises(SyntaxError) as cm:
|
|
from test import badsyntax_future5
|
|
self.check_syntax_error(cm.exception, "badsyntax_future5", 4)
|
|
|
|
def test_badfuture6(self):
|
|
with self.assertRaises(SyntaxError) as cm:
|
|
from test import badsyntax_future6
|
|
self.check_syntax_error(cm.exception, "badsyntax_future6", 3)
|
|
|
|
def test_badfuture7(self):
|
|
with self.assertRaises(SyntaxError) as cm:
|
|
from test import badsyntax_future7
|
|
self.check_syntax_error(cm.exception, "badsyntax_future7", 3, 53)
|
|
|
|
def test_badfuture8(self):
|
|
with self.assertRaises(SyntaxError) as cm:
|
|
from test import badsyntax_future8
|
|
self.check_syntax_error(cm.exception, "badsyntax_future8", 3)
|
|
|
|
def test_badfuture9(self):
|
|
with self.assertRaises(SyntaxError) as cm:
|
|
from test import badsyntax_future9
|
|
self.check_syntax_error(cm.exception, "badsyntax_future9", 3)
|
|
|
|
def test_badfuture10(self):
|
|
with self.assertRaises(SyntaxError) as cm:
|
|
from test import badsyntax_future10
|
|
self.check_syntax_error(cm.exception, "badsyntax_future10", 3)
|
|
|
|
def test_ensure_flags_dont_clash(self):
|
|
# bpo-39562: test that future flags and compiler flags doesn't clash
|
|
|
|
# obtain future flags (CO_FUTURE_***) from the __future__ module
|
|
flags = {
|
|
f"CO_FUTURE_{future.upper()}": getattr(__future__, future).compiler_flag
|
|
for future in __future__.all_feature_names
|
|
}
|
|
# obtain some of the exported compiler flags (PyCF_***) from the ast module
|
|
flags |= {
|
|
flag: getattr(ast, flag)
|
|
for flag in dir(ast) if flag.startswith("PyCF_")
|
|
}
|
|
self.assertCountEqual(set(flags.values()), flags.values())
|
|
|
|
def test_parserhack(self):
|
|
# test that the parser.c::future_hack function works as expected
|
|
# Note: although this test must pass, it's not testing the original
|
|
# bug as of 2.6 since the with statement is not optional and
|
|
# the parser hack disabled. If a new keyword is introduced in
|
|
# 2.6, change this to refer to the new future import.
|
|
try:
|
|
exec("from __future__ import print_function; print 0")
|
|
except SyntaxError:
|
|
pass
|
|
else:
|
|
self.fail("syntax error didn't occur")
|
|
|
|
try:
|
|
exec("from __future__ import (print_function); print 0")
|
|
except SyntaxError:
|
|
pass
|
|
else:
|
|
self.fail("syntax error didn't occur")
|
|
|
|
def test_multiple_features(self):
|
|
with import_helper.CleanImport("test.test_future5"):
|
|
from test import test_future5
|
|
|
|
def test_unicode_literals_exec(self):
|
|
scope = {}
|
|
exec("from __future__ import unicode_literals; x = ''", {}, scope)
|
|
self.assertIsInstance(scope["x"], str)
|
|
|
|
class AnnotationsFutureTestCase(unittest.TestCase):
|
|
template = dedent(
|
|
"""
|
|
from __future__ import annotations
|
|
def f() -> {ann}:
|
|
...
|
|
def g(arg: {ann}) -> None:
|
|
...
|
|
async def f2() -> {ann}:
|
|
...
|
|
async def g2(arg: {ann}) -> None:
|
|
...
|
|
class H:
|
|
var: {ann}
|
|
object.attr: {ann}
|
|
var: {ann}
|
|
var2: {ann} = None
|
|
object.attr: {ann}
|
|
"""
|
|
)
|
|
|
|
def getActual(self, annotation):
|
|
scope = {}
|
|
exec(self.template.format(ann=annotation), {}, scope)
|
|
func_ret_ann = scope['f'].__annotations__['return']
|
|
func_arg_ann = scope['g'].__annotations__['arg']
|
|
async_func_ret_ann = scope['f2'].__annotations__['return']
|
|
async_func_arg_ann = scope['g2'].__annotations__['arg']
|
|
var_ann1 = scope['__annotations__']['var']
|
|
var_ann2 = scope['__annotations__']['var2']
|
|
self.assertEqual(func_ret_ann, func_arg_ann)
|
|
self.assertEqual(func_ret_ann, async_func_ret_ann)
|
|
self.assertEqual(func_ret_ann, async_func_arg_ann)
|
|
self.assertEqual(func_ret_ann, var_ann1)
|
|
self.assertEqual(func_ret_ann, var_ann2)
|
|
return func_ret_ann
|
|
|
|
def assertAnnotationEqual(
|
|
self, annotation, expected=None, drop_parens=False, is_tuple=False,
|
|
):
|
|
actual = self.getActual(annotation)
|
|
if expected is None:
|
|
expected = annotation if not is_tuple else annotation[1:-1]
|
|
if drop_parens:
|
|
self.assertNotEqual(actual, expected)
|
|
actual = actual.replace("(", "").replace(")", "")
|
|
|
|
self.assertEqual(actual, expected)
|
|
|
|
def _exec_future(self, code):
|
|
scope = {}
|
|
exec(
|
|
"from __future__ import annotations\n"
|
|
+ code, scope
|
|
)
|
|
return scope
|
|
|
|
def test_annotations(self):
|
|
eq = self.assertAnnotationEqual
|
|
eq('...')
|
|
eq("'some_string'")
|
|
eq("u'some_string'")
|
|
eq("b'\\xa3'")
|
|
eq('Name')
|
|
eq('None')
|
|
eq('True')
|
|
eq('False')
|
|
eq('1')
|
|
eq('1.0')
|
|
eq('1j')
|
|
eq('True or False')
|
|
eq('True or False or None')
|
|
eq('True and False')
|
|
eq('True and False and None')
|
|
eq('Name1 and Name2 or Name3')
|
|
eq('Name1 and (Name2 or Name3)')
|
|
eq('Name1 or Name2 and Name3')
|
|
eq('(Name1 or Name2) and Name3')
|
|
eq('Name1 and Name2 or Name3 and Name4')
|
|
eq('Name1 or Name2 and Name3 or Name4')
|
|
eq('a + b + (c + d)')
|
|
eq('a * b * (c * d)')
|
|
eq('(a ** b) ** c ** d')
|
|
eq('v1 << 2')
|
|
eq('1 >> v2')
|
|
eq('1 % finished')
|
|
eq('1 + v2 - v3 * 4 ^ 5 ** v6 / 7 // 8')
|
|
eq('not great')
|
|
eq('not not great')
|
|
eq('~great')
|
|
eq('+value')
|
|
eq('++value')
|
|
eq('-1')
|
|
eq('~int and not v1 ^ 123 + v2 | True')
|
|
eq('a + (not b)')
|
|
eq('lambda: None')
|
|
eq('lambda arg: None')
|
|
eq('lambda a=True: a')
|
|
eq('lambda a, b, c=True: a')
|
|
eq("lambda a, b, c=True, *, d=1 << v2, e='str': a")
|
|
eq("lambda a, b, c=True, *vararg, d, e='str', **kwargs: a + b")
|
|
eq("lambda a, /, b, c=True, *vararg, d, e='str', **kwargs: a + b")
|
|
eq('lambda x, /: x')
|
|
eq('lambda x=1, /: x')
|
|
eq('lambda x, /, y: x + y')
|
|
eq('lambda x=1, /, y=2: x + y')
|
|
eq('lambda x, /, y=1: x + y')
|
|
eq('lambda x, /, y=1, *, z=3: x + y + z')
|
|
eq('lambda x=1, /, y=2, *, z=3: x + y + z')
|
|
eq('lambda x=1, /, y=2, *, z: x + y + z')
|
|
eq('lambda x=1, y=2, z=3, /, w=4, *, l, l2: x + y + z + w + l + l2')
|
|
eq('lambda x=1, y=2, z=3, /, w=4, *, l, l2, **kwargs: x + y + z + w + l + l2')
|
|
eq('lambda x, /, y=1, *, z: x + y + z')
|
|
eq('lambda x: lambda y: x + y')
|
|
eq('1 if True else 2')
|
|
eq('str or None if int or True else str or bytes or None')
|
|
eq('str or None if (1 if True else 2) else str or bytes or None')
|
|
eq("0 if not x else 1 if x > 0 else -1")
|
|
eq("(1 if x > 0 else -1) if x else 0")
|
|
eq("{'2.7': dead, '3.7': long_live or die_hard}")
|
|
eq("{'2.7': dead, '3.7': long_live or die_hard, **{'3.6': verygood}}")
|
|
eq("{**a, **b, **c}")
|
|
eq("{'2.7', '3.6', '3.7', '3.8', '3.9', '4.0' if gilectomy else '3.10'}")
|
|
eq("{*a, *b, *c}")
|
|
eq("({'a': 'b'}, True or False, +value, 'string', b'bytes') or None")
|
|
eq("()")
|
|
eq("(a,)")
|
|
eq("(a, b)")
|
|
eq("(a, b, c)")
|
|
eq("(*a, *b, *c)")
|
|
eq("[]")
|
|
eq("[1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or A, 11 or B, 12 or C]")
|
|
eq("[*a, *b, *c]")
|
|
eq("{i for i in (1, 2, 3)}")
|
|
eq("{i ** 2 for i in (1, 2, 3)}")
|
|
eq("{i ** 2 for i, _ in ((1, 'a'), (2, 'b'), (3, 'c'))}")
|
|
eq("{i ** 2 + j for i in (1, 2, 3) for j in (1, 2, 3)}")
|
|
eq("[i for i in (1, 2, 3)]")
|
|
eq("[i ** 2 for i in (1, 2, 3)]")
|
|
eq("[i ** 2 for i, _ in ((1, 'a'), (2, 'b'), (3, 'c'))]")
|
|
eq("[i ** 2 + j for i in (1, 2, 3) for j in (1, 2, 3)]")
|
|
eq("(i for i in (1, 2, 3))")
|
|
eq("(i ** 2 for i in (1, 2, 3))")
|
|
eq("(i ** 2 for i, _ in ((1, 'a'), (2, 'b'), (3, 'c')))")
|
|
eq("(i ** 2 + j for i in (1, 2, 3) for j in (1, 2, 3))")
|
|
eq("{i: 0 for i in (1, 2, 3)}")
|
|
eq("{i: j for i, j in ((1, 'a'), (2, 'b'), (3, 'c'))}")
|
|
eq("[(x, y) for x, y in (a, b)]")
|
|
eq("[(x,) for x, in (a,)]")
|
|
eq("Python3 > Python2 > COBOL")
|
|
eq("Life is Life")
|
|
eq("call()")
|
|
eq("call(arg)")
|
|
eq("call(kwarg='hey')")
|
|
eq("call(arg, kwarg='hey')")
|
|
eq("call(arg, *args, another, kwarg='hey')")
|
|
eq("call(arg, another, kwarg='hey', **kwargs, kwarg2='ho')")
|
|
eq("lukasz.langa.pl")
|
|
eq("call.me(maybe)")
|
|
eq("1 .real")
|
|
eq("1.0.real")
|
|
eq("....__class__")
|
|
eq("list[str]")
|
|
eq("dict[str, int]")
|
|
eq("set[str,]")
|
|
eq("tuple[()]")
|
|
eq("tuple[str, ...]")
|
|
eq("tuple[str, *types]")
|
|
eq("tuple[str, int, (str, int)]")
|
|
eq("tuple[*int, str, str, (str, int)]")
|
|
eq("tuple[str, int, float, dict[str, int]]")
|
|
eq("slice[0]")
|
|
eq("slice[0:1]")
|
|
eq("slice[0:1:2]")
|
|
eq("slice[:]")
|
|
eq("slice[:-1]")
|
|
eq("slice[1:]")
|
|
eq("slice[::-1]")
|
|
eq("slice[:,]")
|
|
eq("slice[1:2,]")
|
|
eq("slice[1:2:3,]")
|
|
eq("slice[1:2, 1]")
|
|
eq("slice[1:2, 2, 3]")
|
|
eq("slice[()]")
|
|
# Note that `slice[*Ts]`, `slice[*Ts,]`, and `slice[(*Ts,)]` all have
|
|
# the same AST, but only `slice[*Ts,]` passes this test, because that's
|
|
# what the unparser produces.
|
|
eq("slice[*Ts,]")
|
|
eq("slice[1, *Ts]")
|
|
eq("slice[*Ts, 2]")
|
|
eq("slice[1, *Ts, 2]")
|
|
eq("slice[*Ts, *Ts]")
|
|
eq("slice[1, *Ts, *Ts]")
|
|
eq("slice[*Ts, 1, *Ts]")
|
|
eq("slice[*Ts, *Ts, 1]")
|
|
eq("slice[1, *Ts, *Ts, 2]")
|
|
eq("slice[1:2, *Ts]")
|
|
eq("slice[*Ts, 1:2]")
|
|
eq("slice[1:2, *Ts, 3:4]")
|
|
eq("slice[a, b:c, d:e:f]")
|
|
eq("slice[(x for x in a)]")
|
|
eq('str or None if sys.version_info[0] > (3,) else str or bytes or None')
|
|
eq("f'f-string without formatted values is just a string'")
|
|
eq("f'{{NOT a formatted value}}'")
|
|
eq("f'some f-string with {a} {few():.2f} {formatted.values!r}'")
|
|
eq('''f"{f'{nested} inner'} outer"''')
|
|
eq("f'space between opening braces: { {a for a in (1, 2, 3)}}'")
|
|
eq("f'{(lambda x: x)}'")
|
|
eq("f'{(None if a else lambda x: x)}'")
|
|
eq("f'{x}'")
|
|
eq("f'{x!r}'")
|
|
eq("f'{x!a}'")
|
|
eq('[x for x in (a if b else c)]')
|
|
eq('[x for x in a if (b if c else d)]')
|
|
eq('f(x for x in a)')
|
|
eq('f(1, (x for x in a))')
|
|
eq('f((x for x in a), 2)')
|
|
eq('(((a)))', 'a')
|
|
eq('(((a, b)))', '(a, b)')
|
|
eq("1 + 2 + 3")
|
|
|
|
def test_fstring_debug_annotations(self):
|
|
# f-strings with '=' don't round trip very well, so set the expected
|
|
# result explicitly.
|
|
self.assertAnnotationEqual("f'{x=!r}'", expected="f'x={x!r}'")
|
|
self.assertAnnotationEqual("f'{x=:}'", expected="f'x={x:}'")
|
|
self.assertAnnotationEqual("f'{x=:.2f}'", expected="f'x={x:.2f}'")
|
|
self.assertAnnotationEqual("f'{x=!r}'", expected="f'x={x!r}'")
|
|
self.assertAnnotationEqual("f'{x=!a}'", expected="f'x={x!a}'")
|
|
self.assertAnnotationEqual("f'{x=!s:*^20}'", expected="f'x={x!s:*^20}'")
|
|
|
|
def test_infinity_numbers(self):
|
|
inf = "1e" + repr(sys.float_info.max_10_exp + 1)
|
|
infj = f"{inf}j"
|
|
self.assertAnnotationEqual("1e1000", expected=inf)
|
|
self.assertAnnotationEqual("1e1000j", expected=infj)
|
|
self.assertAnnotationEqual("-1e1000", expected=f"-{inf}")
|
|
self.assertAnnotationEqual("3+1e1000j", expected=f"3 + {infj}")
|
|
self.assertAnnotationEqual("(1e1000, 1e1000j)", expected=f"({inf}, {infj})")
|
|
self.assertAnnotationEqual("'inf'")
|
|
self.assertAnnotationEqual("('inf', 1e1000, 'infxxx', 1e1000j)", expected=f"('inf', {inf}, 'infxxx', {infj})")
|
|
self.assertAnnotationEqual("(1e1000, (1e1000j,))", expected=f"({inf}, ({infj},))")
|
|
|
|
def test_annotation_with_complex_target(self):
|
|
with self.assertRaises(SyntaxError):
|
|
exec(
|
|
"from __future__ import annotations\n"
|
|
"object.__debug__: int"
|
|
)
|
|
|
|
def test_annotations_symbol_table_pass(self):
|
|
namespace = self._exec_future(dedent("""
|
|
from __future__ import annotations
|
|
|
|
def foo():
|
|
outer = 1
|
|
def bar():
|
|
inner: outer = 1
|
|
return bar
|
|
"""))
|
|
|
|
foo = namespace.pop("foo")
|
|
self.assertIsNone(foo().__closure__)
|
|
self.assertEqual(foo.__code__.co_cellvars, ())
|
|
self.assertEqual(foo().__code__.co_freevars, ())
|
|
|
|
def test_annotations_forbidden(self):
|
|
with self.assertRaises(SyntaxError):
|
|
self._exec_future("test: (yield)")
|
|
|
|
with self.assertRaises(SyntaxError):
|
|
self._exec_future("test.test: (yield a + b)")
|
|
|
|
with self.assertRaises(SyntaxError):
|
|
self._exec_future("test[something]: (yield from x)")
|
|
|
|
with self.assertRaises(SyntaxError):
|
|
self._exec_future("def func(test: (yield from outside_of_generator)): pass")
|
|
|
|
with self.assertRaises(SyntaxError):
|
|
self._exec_future("def test() -> (await y): pass")
|
|
|
|
with self.assertRaises(SyntaxError):
|
|
self._exec_future("async def test() -> something((a := b)): pass")
|
|
|
|
with self.assertRaises(SyntaxError):
|
|
self._exec_future("test: await some.complicated[0].call(with_args=True or 1 is not 1)")
|
|
|
|
with self.assertRaises(SyntaxError):
|
|
self._exec_future("test: f'{(x := 10):=10}'")
|
|
|
|
with self.assertRaises(SyntaxError):
|
|
self._exec_future(dedent("""\
|
|
def foo():
|
|
def bar(arg: (yield)): pass
|
|
"""))
|
|
|
|
def test_get_type_hints_on_func_with_variadic_arg(self):
|
|
# `typing.get_type_hints` might break on a function with a variadic
|
|
# annotation (e.g. `f(*args: *Ts)`) if `from __future__ import
|
|
# annotations`, because it could try to evaluate `*Ts` as an expression,
|
|
# which on its own isn't value syntax.
|
|
namespace = self._exec_future(dedent("""\
|
|
class StarredC: pass
|
|
class C:
|
|
def __iter__(self):
|
|
yield StarredC()
|
|
c = C()
|
|
def f(*args: *c): pass
|
|
import typing
|
|
hints = typing.get_type_hints(f)
|
|
"""))
|
|
|
|
hints = namespace.pop('hints')
|
|
self.assertIsInstance(hints['args'], namespace['StarredC'])
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|