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import unittest
from test import test_support
seq, res = 'abc', [(0,'a'), (1,'b'), (2,'c')]
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
def test_basicfunction(self):
self.assertEqual(type(self.enum(seq)), self.enum)
e = self.enum(seq)
self.assertEqual(iter(e), e)
self.assertEqual(list(self.enum(seq)), res)
self.enum.__doc__
def test_getitemseqn(self):
self.assertEqual(list(self.enum(G(seq))), res)
e = self.enum(G(''))
self.assertRaises(StopIteration, e.next)
def test_iteratorseqn(self):
self.assertEqual(list(self.enum(I(seq))), res)
e = self.enum(I(''))
self.assertRaises(StopIteration, e.next)
def test_iteratorgenerator(self):
self.assertEqual(list(self.enum(Ig(seq))), res)
e = self.enum(Ig(''))
self.assertRaises(StopIteration, e.next)
def test_noniterable(self):
self.assertRaises(TypeError, self.enum, X(seq))
def test_illformediterable(self):
self.assertRaises(TypeError, list, self.enum(N(seq)))
def test_exception_propagation(self):
self.assertRaises(ZeroDivisionError, list, self.enum(E(seq)))
class MyEnum(enumerate):
pass
class SubclassTestCase(EnumerateTestCase):
enum = MyEnum
def test_main():
test_support.run_unittest(EnumerateTestCase, SubclassTestCase)
if __name__ == "__main__":
test_main()
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