Staging
v0.8.1
v0.8.1
https://github.com/python/cpython
Tip revision: 74f4bd53e03ded8408bcc2de67cf0f5a4ac5b1a1 authored by Barry Warsaw on 23 February 2012, 15:59:38 UTC
Bump some more copyright years (as per PEP 101), since this is the first
Bump some more copyright years (as per PEP 101), since this is the first
Tip revision: 74f4bd5
test_enumerate.py
import unittest
import sys
from test import test_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 EnumerateTestCase(unittest.TestCase):
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_getitemseqn(self):
self.assertEqual(list(self.enum(G(self.seq))), self.res)
e = self.enum(G(''))
self.assertRaises(StopIteration, e.next)
def test_iteratorseqn(self):
self.assertEqual(list(self.enum(I(self.seq))), self.res)
e = self.enum(I(''))
self.assertRaises(StopIteration, e.next)
def test_iteratorgenerator(self):
self.assertEqual(list(self.enum(Ig(self.seq))), self.res)
e = self.enum(Ig(''))
self.assertRaises(StopIteration, e.next)
def test_noniterable(self):
self.assertRaises(TypeError, self.enum, X(self.seq))
def test_illformediterable(self):
self.assertRaises(TypeError, list, 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_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)))
class MyEnum(enumerate):
pass
class SubclassTestCase(EnumerateTestCase):
enum = MyEnum
class TestEmpty(EnumerateTestCase):
seq, res = '', []
class TestBig(EnumerateTestCase):
seq = range(10,20000,2)
res = zip(range(20000), seq)
class TestReversed(unittest.TestCase):
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(), xrange(1,17,5):
self.assertEqual(list(data)[::-1], list(reversed(data)))
self.assertRaises(TypeError, reversed, {})
# don't allow keyword arguments
self.assertRaises(TypeError, reversed, [], a=1)
def test_xrange_optimization(self):
x = xrange(1)
self.assertEqual(type(reversed(x)), type(iter(x)))
def test_len(self):
# This is an implementation detail, not an interface requirement
from test.test_iterlen import len
for s in ('hello', tuple('hello'), list('hello'), xrange(5)):
self.assertEqual(len(reversed(s)), len(s))
r = reversed(s)
list(r)
self.assertEqual(len(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, len, 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')
def test_bug1229429(self):
# this bug was never in reversed, it was in
# PyObject_CallMethod, and reversed_new calls that sometimes.
if not hasattr(sys, "getrefcount"):
return
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))
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):
enum = lambda self, i: enumerate(i, start=11)
seq, res = 'abc', [(11, 'a'), (12, 'b'), (13, 'c')]
class TestLongStart(EnumerateStartTestCase):
enum = lambda self, i: enumerate(i, start=sys.maxint+1)
seq, res = 'abc', [(sys.maxint+1,'a'), (sys.maxint+2,'b'),
(sys.maxint+3,'c')]
def test_main(verbose=None):
test_support.run_unittest(__name__)
# verify reference counting
if verbose and hasattr(sys, "gettotalrefcount"):
counts = [None] * 5
for i in xrange(len(counts)):
test_support.run_unittest(__name__)
counts[i] = sys.gettotalrefcount()
print counts
if __name__ == "__main__":
test_main(verbose=True)