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cpython/Lib/test/test_bisect.py

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import sys
import unittest
from test import support
from collections import UserList
# We do a bit of trickery here to be able to test both the C implementation
# and the Python implementation of the module.
# Make it impossible to import the C implementation anymore.
sys.modules['_bisect'] = 0
# We must also handle the case that bisect was imported before.
if 'bisect' in sys.modules:
del sys.modules['bisect']
# Now we can import the module and get the pure Python implementation.
import bisect as py_bisect
# Restore everything to normal.
del sys.modules['_bisect']
del sys.modules['bisect']
# This is now the module with the C implementation.
import bisect as c_bisect
class TestBisect(unittest.TestCase):
module = None
def setUp(self):
self.precomputedCases = [
(self.module.bisect_right, [], 1, 0),
(self.module.bisect_right, [1], 0, 0),
(self.module.bisect_right, [1], 1, 1),
(self.module.bisect_right, [1], 2, 1),
(self.module.bisect_right, [1, 1], 0, 0),
(self.module.bisect_right, [1, 1], 1, 2),
(self.module.bisect_right, [1, 1], 2, 2),
(self.module.bisect_right, [1, 1, 1], 0, 0),
(self.module.bisect_right, [1, 1, 1], 1, 3),
(self.module.bisect_right, [1, 1, 1], 2, 3),
(self.module.bisect_right, [1, 1, 1, 1], 0, 0),
(self.module.bisect_right, [1, 1, 1, 1], 1, 4),
(self.module.bisect_right, [1, 1, 1, 1], 2, 4),
(self.module.bisect_right, [1, 2], 0, 0),
(self.module.bisect_right, [1, 2], 1, 1),
(self.module.bisect_right, [1, 2], 1.5, 1),
(self.module.bisect_right, [1, 2], 2, 2),
(self.module.bisect_right, [1, 2], 3, 2),
(self.module.bisect_right, [1, 1, 2, 2], 0, 0),
(self.module.bisect_right, [1, 1, 2, 2], 1, 2),
(self.module.bisect_right, [1, 1, 2, 2], 1.5, 2),
(self.module.bisect_right, [1, 1, 2, 2], 2, 4),
(self.module.bisect_right, [1, 1, 2, 2], 3, 4),
(self.module.bisect_right, [1, 2, 3], 0, 0),
(self.module.bisect_right, [1, 2, 3], 1, 1),
(self.module.bisect_right, [1, 2, 3], 1.5, 1),
(self.module.bisect_right, [1, 2, 3], 2, 2),
(self.module.bisect_right, [1, 2, 3], 2.5, 2),
(self.module.bisect_right, [1, 2, 3], 3, 3),
(self.module.bisect_right, [1, 2, 3], 4, 3),
(self.module.bisect_right, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 0, 0),
(self.module.bisect_right, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 1, 1),
(self.module.bisect_right, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 1.5, 1),
(self.module.bisect_right, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 2, 3),
(self.module.bisect_right, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 2.5, 3),
(self.module.bisect_right, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 3, 6),
(self.module.bisect_right, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 3.5, 6),
(self.module.bisect_right, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 4, 10),
(self.module.bisect_right, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 5, 10),
(self.module.bisect_left, [], 1, 0),
(self.module.bisect_left, [1], 0, 0),
(self.module.bisect_left, [1], 1, 0),
(self.module.bisect_left, [1], 2, 1),
(self.module.bisect_left, [1, 1], 0, 0),
(self.module.bisect_left, [1, 1], 1, 0),
(self.module.bisect_left, [1, 1], 2, 2),
(self.module.bisect_left, [1, 1, 1], 0, 0),
(self.module.bisect_left, [1, 1, 1], 1, 0),
(self.module.bisect_left, [1, 1, 1], 2, 3),
(self.module.bisect_left, [1, 1, 1, 1], 0, 0),
(self.module.bisect_left, [1, 1, 1, 1], 1, 0),
(self.module.bisect_left, [1, 1, 1, 1], 2, 4),
(self.module.bisect_left, [1, 2], 0, 0),
(self.module.bisect_left, [1, 2], 1, 0),
(self.module.bisect_left, [1, 2], 1.5, 1),
(self.module.bisect_left, [1, 2], 2, 1),
(self.module.bisect_left, [1, 2], 3, 2),
(self.module.bisect_left, [1, 1, 2, 2], 0, 0),
(self.module.bisect_left, [1, 1, 2, 2], 1, 0),
(self.module.bisect_left, [1, 1, 2, 2], 1.5, 2),
(self.module.bisect_left, [1, 1, 2, 2], 2, 2),
(self.module.bisect_left, [1, 1, 2, 2], 3, 4),
(self.module.bisect_left, [1, 2, 3], 0, 0),
(self.module.bisect_left, [1, 2, 3], 1, 0),
(self.module.bisect_left, [1, 2, 3], 1.5, 1),
(self.module.bisect_left, [1, 2, 3], 2, 1),
(self.module.bisect_left, [1, 2, 3], 2.5, 2),
(self.module.bisect_left, [1, 2, 3], 3, 2),
(self.module.bisect_left, [1, 2, 3], 4, 3),
(self.module.bisect_left, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 0, 0),
(self.module.bisect_left, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 1, 0),
(self.module.bisect_left, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 1.5, 1),
(self.module.bisect_left, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 2, 1),
(self.module.bisect_left, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 2.5, 3),
(self.module.bisect_left, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 3, 3),
(self.module.bisect_left, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 3.5, 6),
(self.module.bisect_left, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 4, 6),
(self.module.bisect_left, [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], 5, 10)
]
def test_precomputed(self):
for func, data, elem, expected in self.precomputedCases:
self.assertEqual(func(data, elem), expected)
self.assertEqual(func(UserList(data), elem), expected)
def test_negative_lo(self):
# Issue 3301
mod = self.module
self.assertRaises(ValueError, mod.bisect_left, [1, 2, 3], 5, -1, 3),
self.assertRaises(ValueError, mod.bisect_right, [1, 2, 3], 5, -1, 3),
self.assertRaises(ValueError, mod.insort_left, [1, 2, 3], 5, -1, 3),
self.assertRaises(ValueError, mod.insort_right, [1, 2, 3], 5, -1, 3),
def test_random(self, n=25):
from random import randrange
for i in range(n):
data = [randrange(0, n, 2) for j in range(i)]
data.sort()
elem = randrange(-1, n+1)
ip = self.module.bisect_left(data, elem)
if ip < len(data):
self.failUnless(elem <= data[ip])
if ip > 0:
self.failUnless(data[ip-1] < elem)
ip = self.module.bisect_right(data, elem)
if ip < len(data):
self.failUnless(elem < data[ip])
if ip > 0:
self.failUnless(data[ip-1] <= elem)
def test_optionalSlicing(self):
for func, data, elem, expected in self.precomputedCases:
for lo in range(4):
lo = min(len(data), lo)
for hi in range(3,8):
hi = min(len(data), hi)
ip = func(data, elem, lo, hi)
self.failUnless(lo <= ip <= hi)
if func is self.module.bisect_left and ip < hi:
self.failUnless(elem <= data[ip])
if func is self.module.bisect_left and ip > lo:
self.failUnless(data[ip-1] < elem)
if func is self.module.bisect_right and ip < hi:
self.failUnless(elem < data[ip])
if func is self.module.bisect_right and ip > lo:
self.failUnless(data[ip-1] <= elem)
self.assertEqual(ip, max(lo, min(hi, expected)))
def test_backcompatibility(self):
self.assertEqual(self.module.bisect, self.module.bisect_right)
def test_keyword_args(self):
data = [10, 20, 30, 40, 50]
self.assertEqual(self.module.bisect_left(a=data, x=25, lo=1, hi=3), 2)
self.assertEqual(self.module.bisect_right(a=data, x=25, lo=1, hi=3), 2)
self.assertEqual(self.module.bisect(a=data, x=25, lo=1, hi=3), 2)
self.module.insort_left(a=data, x=25, lo=1, hi=3)
self.module.insort_right(a=data, x=25, lo=1, hi=3)
self.module.insort(a=data, x=25, lo=1, hi=3)
self.assertEqual(data, [10, 20, 25, 25, 25, 30, 40, 50])
class TestBisectPython(TestBisect):
module = py_bisect
class TestBisectC(TestBisect):
module = c_bisect
#==============================================================================
class TestInsort(unittest.TestCase):
module = None
def test_vsBuiltinSort(self, n=500):
from random import choice
for insorted in (list(), UserList()):
for i in range(n):
digit = choice("0123456789")
if digit in "02468":
f = self.module.insort_left
else:
f = self.module.insort_right
f(insorted, digit)
self.assertEqual(sorted(insorted), insorted)
def test_backcompatibility(self):
self.assertEqual(self.module.insort, self.module.insort_right)
class TestInsortPython(TestInsort):
module = py_bisect
class TestInsortC(TestInsort):
module = c_bisect
#==============================================================================
class LenOnly:
"Dummy sequence class defining __len__ but not __getitem__."
def __len__(self):
return 10
class GetOnly:
"Dummy sequence class defining __getitem__ but not __len__."
def __getitem__(self, ndx):
return 10
class CmpErr:
"Dummy element that always raises an error during comparison"
def __lt__(self, other):
raise ZeroDivisionError
__gt__ = __lt__
__le__ = __lt__
__ge__ = __lt__
__eq__ = __lt__
__ne__ = __lt__
class TestErrorHandling(unittest.TestCase):
module = None
def test_non_sequence(self):
for f in (self.module.bisect_left, self.module.bisect_right,
self.module.insort_left, self.module.insort_right):
self.assertRaises(TypeError, f, 10, 10)
def test_len_only(self):
for f in (self.module.bisect_left, self.module.bisect_right,
self.module.insort_left, self.module.insort_right):
self.assertRaises(TypeError, f, LenOnly(), 10)
def test_get_only(self):
for f in (self.module.bisect_left, self.module.bisect_right,
self.module.insort_left, self.module.insort_right):
self.assertRaises(TypeError, f, GetOnly(), 10)
def test_cmp_err(self):
seq = [CmpErr(), CmpErr(), CmpErr()]
for f in (self.module.bisect_left, self.module.bisect_right,
self.module.insort_left, self.module.insort_right):
self.assertRaises(ZeroDivisionError, f, seq, 10)
def test_arg_parsing(self):
for f in (self.module.bisect_left, self.module.bisect_right,
self.module.insort_left, self.module.insort_right):
self.assertRaises(TypeError, f, 10)
class TestErrorHandlingPython(TestErrorHandling):
module = py_bisect
class TestErrorHandlingC(TestErrorHandling):
module = c_bisect
#==============================================================================
libreftest = """
Example from the Library Reference: Doc/library/bisect.rst
The bisect() function is generally useful for categorizing numeric data.
This example uses bisect() to look up a letter grade for an exam total
(say) based on a set of ordered numeric breakpoints: 85 and up is an `A',
75..84 is a `B', etc.
>>> grades = "FEDCBA"
>>> breakpoints = [30, 44, 66, 75, 85]
>>> from bisect import bisect
>>> def grade(total):
... return grades[bisect(breakpoints, total)]
...
>>> grade(66)
'C'
>>> list(map(grade, [33, 99, 77, 44, 12, 88]))
['E', 'A', 'B', 'D', 'F', 'A']
"""
#------------------------------------------------------------------------------
__test__ = {'libreftest' : libreftest}
def test_main(verbose=None):
from test import test_bisect
test_classes = [TestBisectPython, TestBisectC,
TestInsortPython, TestInsortC,
TestErrorHandlingPython, TestErrorHandlingC]
support.run_unittest(*test_classes)
support.run_doctest(test_bisect, verbose)
# verify reference counting
if verbose and hasattr(sys, "gettotalrefcount"):
import gc
counts = [None] * 5
for i in range(len(counts)):
support.run_unittest(*test_classes)
gc.collect()
counts[i] = sys.gettotalrefcount()
print(counts)
if __name__ == "__main__":
test_main(verbose=True)
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