1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
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, 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', 2) # 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 = list(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, {})
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))
def test_main(verbose=None):
testclasses = (EnumerateTestCase, SubclassTestCase, TestEmpty, TestBig,
TestReversed)
test_support.run_unittest(*testclasses)
# verify reference counting
import sys
if verbose and hasattr(sys, "gettotalrefcount"):
counts = [None] * 5
for i in xrange(len(counts)):
test_support.run_unittest(*testclasses)
counts[i] = sys.gettotalrefcount()
print(counts)
if __name__ == "__main__":
test_main(verbose=True)
|
