mirror of
https://github.com/python/cpython.git
synced 2024-11-21 21:09:37 +01:00
297 lines
9.1 KiB
Python
297 lines
9.1 KiB
Python
import unittest
|
|
import operator
|
|
import sys
|
|
import pickle
|
|
import gc
|
|
|
|
from test import support
|
|
|
|
class G:
|
|
'Sequence using __getitem__'
|
|
def __init__(self, seqn):
|
|
self.seqn = seqn
|
|
def __getitem__(self, i):
|
|
return self.seqn[i]
|
|
|
|
class I:
|
|
'Sequence using iterator protocol'
|
|
def __init__(self, seqn):
|
|
self.seqn = seqn
|
|
self.i = 0
|
|
def __iter__(self):
|
|
return self
|
|
def __next__(self):
|
|
if self.i >= len(self.seqn): raise StopIteration
|
|
v = self.seqn[self.i]
|
|
self.i += 1
|
|
return v
|
|
|
|
class Ig:
|
|
'Sequence using iterator protocol defined with a generator'
|
|
def __init__(self, seqn):
|
|
self.seqn = seqn
|
|
self.i = 0
|
|
def __iter__(self):
|
|
for val in self.seqn:
|
|
yield val
|
|
|
|
class X:
|
|
'Missing __getitem__ and __iter__'
|
|
def __init__(self, seqn):
|
|
self.seqn = seqn
|
|
self.i = 0
|
|
def __next__(self):
|
|
if self.i >= len(self.seqn): raise StopIteration
|
|
v = self.seqn[self.i]
|
|
self.i += 1
|
|
return v
|
|
|
|
class E:
|
|
'Test propagation of exceptions'
|
|
def __init__(self, seqn):
|
|
self.seqn = seqn
|
|
self.i = 0
|
|
def __iter__(self):
|
|
return self
|
|
def __next__(self):
|
|
3 // 0
|
|
|
|
class N:
|
|
'Iterator missing __next__()'
|
|
def __init__(self, seqn):
|
|
self.seqn = seqn
|
|
self.i = 0
|
|
def __iter__(self):
|
|
return self
|
|
|
|
class PickleTest:
|
|
# Helper to check picklability
|
|
def check_pickle(self, itorg, seq):
|
|
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
|
|
d = pickle.dumps(itorg, proto)
|
|
it = pickle.loads(d)
|
|
self.assertEqual(type(itorg), type(it))
|
|
self.assertEqual(list(it), seq)
|
|
|
|
it = pickle.loads(d)
|
|
try:
|
|
next(it)
|
|
except StopIteration:
|
|
self.assertFalse(seq[1:])
|
|
continue
|
|
d = pickle.dumps(it, proto)
|
|
it = pickle.loads(d)
|
|
self.assertEqual(list(it), seq[1:])
|
|
|
|
class EnumerateTestCase(unittest.TestCase, PickleTest):
|
|
|
|
enum = enumerate
|
|
seq, res = 'abc', [(0,'a'), (1,'b'), (2,'c')]
|
|
|
|
def test_basicfunction(self):
|
|
self.assertEqual(type(self.enum(self.seq)), self.enum)
|
|
e = self.enum(self.seq)
|
|
self.assertEqual(iter(e), e)
|
|
self.assertEqual(list(self.enum(self.seq)), self.res)
|
|
self.enum.__doc__
|
|
|
|
def test_pickle(self):
|
|
self.check_pickle(self.enum(self.seq), self.res)
|
|
|
|
def test_getitemseqn(self):
|
|
self.assertEqual(list(self.enum(G(self.seq))), self.res)
|
|
e = self.enum(G(''))
|
|
self.assertRaises(StopIteration, next, e)
|
|
|
|
def test_iteratorseqn(self):
|
|
self.assertEqual(list(self.enum(I(self.seq))), self.res)
|
|
e = self.enum(I(''))
|
|
self.assertRaises(StopIteration, next, e)
|
|
|
|
def test_iteratorgenerator(self):
|
|
self.assertEqual(list(self.enum(Ig(self.seq))), self.res)
|
|
e = self.enum(Ig(''))
|
|
self.assertRaises(StopIteration, next, e)
|
|
|
|
def test_noniterable(self):
|
|
self.assertRaises(TypeError, self.enum, X(self.seq))
|
|
|
|
def test_illformediterable(self):
|
|
self.assertRaises(TypeError, self.enum, N(self.seq))
|
|
|
|
def test_exception_propagation(self):
|
|
self.assertRaises(ZeroDivisionError, list, self.enum(E(self.seq)))
|
|
|
|
def test_argumentcheck(self):
|
|
self.assertRaises(TypeError, self.enum) # no arguments
|
|
self.assertRaises(TypeError, self.enum, 1) # wrong type (not iterable)
|
|
self.assertRaises(TypeError, self.enum, 'abc', 'a') # wrong type
|
|
self.assertRaises(TypeError, self.enum, 'abc', 2, 3) # too many arguments
|
|
|
|
def test_kwargs(self):
|
|
self.assertEqual(list(self.enum(iterable=Ig(self.seq))), self.res)
|
|
expected = list(self.enum(Ig(self.seq), 0))
|
|
self.assertEqual(list(self.enum(iterable=Ig(self.seq), start=0)),
|
|
expected)
|
|
self.assertEqual(list(self.enum(start=0, iterable=Ig(self.seq))),
|
|
expected)
|
|
self.assertRaises(TypeError, self.enum, iterable=[], x=3)
|
|
self.assertRaises(TypeError, self.enum, start=0, x=3)
|
|
self.assertRaises(TypeError, self.enum, x=0, y=3)
|
|
self.assertRaises(TypeError, self.enum, x=0)
|
|
|
|
@support.cpython_only
|
|
def test_tuple_reuse(self):
|
|
# Tests an implementation detail where tuple is reused
|
|
# whenever nothing else holds a reference to it
|
|
self.assertEqual(len(set(map(id, list(enumerate(self.seq))))), len(self.seq))
|
|
self.assertEqual(len(set(map(id, enumerate(self.seq)))), min(1,len(self.seq)))
|
|
|
|
@support.cpython_only
|
|
def test_enumerate_result_gc(self):
|
|
# bpo-42536: enumerate's tuple-reuse speed trick breaks the GC's
|
|
# assumptions about what can be untracked. Make sure we re-track result
|
|
# tuples whenever we reuse them.
|
|
it = self.enum([[]])
|
|
gc.collect()
|
|
# That GC collection probably untracked the recycled internal result
|
|
# tuple, which is initialized to (None, None). Make sure it's re-tracked
|
|
# when it's mutated and returned from __next__:
|
|
self.assertTrue(gc.is_tracked(next(it)))
|
|
|
|
class MyEnum(enumerate):
|
|
pass
|
|
|
|
class SubclassTestCase(EnumerateTestCase):
|
|
|
|
enum = MyEnum
|
|
|
|
class TestEmpty(EnumerateTestCase):
|
|
|
|
seq, res = '', []
|
|
|
|
class TestBig(EnumerateTestCase):
|
|
|
|
seq = range(10,20000,2)
|
|
res = list(zip(range(20000), seq))
|
|
|
|
class TestReversed(unittest.TestCase, PickleTest):
|
|
|
|
def test_simple(self):
|
|
class A:
|
|
def __getitem__(self, i):
|
|
if i < 5:
|
|
return str(i)
|
|
raise StopIteration
|
|
def __len__(self):
|
|
return 5
|
|
for data in ('abc', range(5), tuple(enumerate('abc')), A(),
|
|
range(1,17,5), dict.fromkeys('abcde')):
|
|
self.assertEqual(list(data)[::-1], list(reversed(data)))
|
|
# don't allow keyword arguments
|
|
self.assertRaises(TypeError, reversed, [], a=1)
|
|
|
|
def test_range_optimization(self):
|
|
x = range(1)
|
|
self.assertEqual(type(reversed(x)), type(iter(x)))
|
|
|
|
def test_len(self):
|
|
for s in ('hello', tuple('hello'), list('hello'), range(5)):
|
|
self.assertEqual(operator.length_hint(reversed(s)), len(s))
|
|
r = reversed(s)
|
|
list(r)
|
|
self.assertEqual(operator.length_hint(r), 0)
|
|
class SeqWithWeirdLen:
|
|
called = False
|
|
def __len__(self):
|
|
if not self.called:
|
|
self.called = True
|
|
return 10
|
|
raise ZeroDivisionError
|
|
def __getitem__(self, index):
|
|
return index
|
|
r = reversed(SeqWithWeirdLen())
|
|
self.assertRaises(ZeroDivisionError, operator.length_hint, r)
|
|
|
|
|
|
def test_gc(self):
|
|
class Seq:
|
|
def __len__(self):
|
|
return 10
|
|
def __getitem__(self, index):
|
|
return index
|
|
s = Seq()
|
|
r = reversed(s)
|
|
s.r = r
|
|
|
|
def test_args(self):
|
|
self.assertRaises(TypeError, reversed)
|
|
self.assertRaises(TypeError, reversed, [], 'extra')
|
|
|
|
@unittest.skipUnless(hasattr(sys, 'getrefcount'), 'test needs sys.getrefcount()')
|
|
def test_bug1229429(self):
|
|
# this bug was never in reversed, it was in
|
|
# PyObject_CallMethod, and reversed_new calls that sometimes.
|
|
def f():
|
|
pass
|
|
r = f.__reversed__ = object()
|
|
rc = sys.getrefcount(r)
|
|
for i in range(10):
|
|
try:
|
|
reversed(f)
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
self.fail("non-callable __reversed__ didn't raise!")
|
|
self.assertEqual(rc, sys.getrefcount(r))
|
|
|
|
def test_objmethods(self):
|
|
# Objects must have __len__() and __getitem__() implemented.
|
|
class NoLen(object):
|
|
def __getitem__(self, i): return 1
|
|
nl = NoLen()
|
|
self.assertRaises(TypeError, reversed, nl)
|
|
|
|
class NoGetItem(object):
|
|
def __len__(self): return 2
|
|
ngi = NoGetItem()
|
|
self.assertRaises(TypeError, reversed, ngi)
|
|
|
|
class Blocked(object):
|
|
def __getitem__(self, i): return 1
|
|
def __len__(self): return 2
|
|
__reversed__ = None
|
|
b = Blocked()
|
|
self.assertRaises(TypeError, reversed, b)
|
|
|
|
def test_pickle(self):
|
|
for data in 'abc', range(5), tuple(enumerate('abc')), range(1,17,5):
|
|
self.check_pickle(reversed(data), list(data)[::-1])
|
|
|
|
|
|
class EnumerateStartTestCase(EnumerateTestCase):
|
|
|
|
def test_basicfunction(self):
|
|
e = self.enum(self.seq)
|
|
self.assertEqual(iter(e), e)
|
|
self.assertEqual(list(self.enum(self.seq)), self.res)
|
|
|
|
|
|
class TestStart(EnumerateStartTestCase):
|
|
def enum(self, iterable, start=11):
|
|
return enumerate(iterable, start=start)
|
|
|
|
seq, res = 'abc', [(11, 'a'), (12, 'b'), (13, 'c')]
|
|
|
|
|
|
class TestLongStart(EnumerateStartTestCase):
|
|
def enum(self, iterable, start=sys.maxsize + 1):
|
|
return enumerate(iterable, start=start)
|
|
|
|
seq, res = 'abc', [(sys.maxsize+1,'a'), (sys.maxsize+2,'b'),
|
|
(sys.maxsize+3,'c')]
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|