mirror of
https://github.com/python/cpython.git
synced 2024-12-15 12:54:31 +08:00
884 lines
27 KiB
Python
884 lines
27 KiB
Python
# Test iterators.
|
|
|
|
import unittest
|
|
from test_support import run_unittest, TESTFN, unlink, have_unicode
|
|
|
|
# Test result of triple loop (too big to inline)
|
|
TRIPLETS = [(0, 0, 0), (0, 0, 1), (0, 0, 2),
|
|
(0, 1, 0), (0, 1, 1), (0, 1, 2),
|
|
(0, 2, 0), (0, 2, 1), (0, 2, 2),
|
|
|
|
(1, 0, 0), (1, 0, 1), (1, 0, 2),
|
|
(1, 1, 0), (1, 1, 1), (1, 1, 2),
|
|
(1, 2, 0), (1, 2, 1), (1, 2, 2),
|
|
|
|
(2, 0, 0), (2, 0, 1), (2, 0, 2),
|
|
(2, 1, 0), (2, 1, 1), (2, 1, 2),
|
|
(2, 2, 0), (2, 2, 1), (2, 2, 2)]
|
|
|
|
# Helper classes
|
|
|
|
class BasicIterClass:
|
|
def __init__(self, n):
|
|
self.n = n
|
|
self.i = 0
|
|
def next(self):
|
|
res = self.i
|
|
if res >= self.n:
|
|
raise StopIteration
|
|
self.i = res + 1
|
|
return res
|
|
|
|
class IteratingSequenceClass:
|
|
def __init__(self, n):
|
|
self.n = n
|
|
def __iter__(self):
|
|
return BasicIterClass(self.n)
|
|
|
|
class SequenceClass:
|
|
def __init__(self, n):
|
|
self.n = n
|
|
def __getitem__(self, i):
|
|
if 0 <= i < self.n:
|
|
return i
|
|
else:
|
|
raise IndexError
|
|
|
|
# Main test suite
|
|
|
|
class TestCase(unittest.TestCase):
|
|
|
|
# Helper to check that an iterator returns a given sequence
|
|
def check_iterator(self, it, seq):
|
|
res = []
|
|
while 1:
|
|
try:
|
|
val = it.next()
|
|
except StopIteration:
|
|
break
|
|
res.append(val)
|
|
self.assertEqual(res, seq)
|
|
|
|
# Helper to check that a for loop generates a given sequence
|
|
def check_for_loop(self, expr, seq):
|
|
res = []
|
|
for val in expr:
|
|
res.append(val)
|
|
self.assertEqual(res, seq)
|
|
|
|
# Test basic use of iter() function
|
|
def test_iter_basic(self):
|
|
self.check_iterator(iter(range(10)), range(10))
|
|
|
|
# Test that iter(iter(x)) is the same as iter(x)
|
|
def test_iter_idempotency(self):
|
|
seq = range(10)
|
|
it = iter(seq)
|
|
it2 = iter(it)
|
|
self.assert_(it is it2)
|
|
|
|
# Test that for loops over iterators work
|
|
def test_iter_for_loop(self):
|
|
self.check_for_loop(iter(range(10)), range(10))
|
|
|
|
# Test several independent iterators over the same list
|
|
def test_iter_independence(self):
|
|
seq = range(3)
|
|
res = []
|
|
for i in iter(seq):
|
|
for j in iter(seq):
|
|
for k in iter(seq):
|
|
res.append((i, j, k))
|
|
self.assertEqual(res, TRIPLETS)
|
|
|
|
# Test triple list comprehension using iterators
|
|
def test_nested_comprehensions_iter(self):
|
|
seq = range(3)
|
|
res = [(i, j, k)
|
|
for i in iter(seq) for j in iter(seq) for k in iter(seq)]
|
|
self.assertEqual(res, TRIPLETS)
|
|
|
|
# Test triple list comprehension without iterators
|
|
def test_nested_comprehensions_for(self):
|
|
seq = range(3)
|
|
res = [(i, j, k) for i in seq for j in seq for k in seq]
|
|
self.assertEqual(res, TRIPLETS)
|
|
|
|
# Test a class with __iter__ in a for loop
|
|
def test_iter_class_for(self):
|
|
self.check_for_loop(IteratingSequenceClass(10), range(10))
|
|
|
|
# Test a class with __iter__ with explicit iter()
|
|
def test_iter_class_iter(self):
|
|
self.check_iterator(iter(IteratingSequenceClass(10)), range(10))
|
|
|
|
# Test for loop on a sequence class without __iter__
|
|
def test_seq_class_for(self):
|
|
self.check_for_loop(SequenceClass(10), range(10))
|
|
|
|
# Test iter() on a sequence class without __iter__
|
|
def test_seq_class_iter(self):
|
|
self.check_iterator(iter(SequenceClass(10)), range(10))
|
|
|
|
# Test two-argument iter() with callable instance
|
|
def test_iter_callable(self):
|
|
class C:
|
|
def __init__(self):
|
|
self.i = 0
|
|
def __call__(self):
|
|
i = self.i
|
|
self.i = i + 1
|
|
if i > 100:
|
|
raise IndexError # Emergency stop
|
|
return i
|
|
self.check_iterator(iter(C(), 10), range(10))
|
|
|
|
# Test two-argument iter() with function
|
|
def test_iter_function(self):
|
|
def spam(state=[0]):
|
|
i = state[0]
|
|
state[0] = i+1
|
|
return i
|
|
self.check_iterator(iter(spam, 10), range(10))
|
|
|
|
# Test two-argument iter() with function that raises StopIteration
|
|
def test_iter_function_stop(self):
|
|
def spam(state=[0]):
|
|
i = state[0]
|
|
if i == 10:
|
|
raise StopIteration
|
|
state[0] = i+1
|
|
return i
|
|
self.check_iterator(iter(spam, 20), range(10))
|
|
|
|
# Test exception propagation through function iterator
|
|
def test_exception_function(self):
|
|
def spam(state=[0]):
|
|
i = state[0]
|
|
state[0] = i+1
|
|
if i == 10:
|
|
raise RuntimeError
|
|
return i
|
|
res = []
|
|
try:
|
|
for x in iter(spam, 20):
|
|
res.append(x)
|
|
except RuntimeError:
|
|
self.assertEqual(res, range(10))
|
|
else:
|
|
self.fail("should have raised RuntimeError")
|
|
|
|
# Test exception propagation through sequence iterator
|
|
def test_exception_sequence(self):
|
|
class MySequenceClass(SequenceClass):
|
|
def __getitem__(self, i):
|
|
if i == 10:
|
|
raise RuntimeError
|
|
return SequenceClass.__getitem__(self, i)
|
|
res = []
|
|
try:
|
|
for x in MySequenceClass(20):
|
|
res.append(x)
|
|
except RuntimeError:
|
|
self.assertEqual(res, range(10))
|
|
else:
|
|
self.fail("should have raised RuntimeError")
|
|
|
|
# Test for StopIteration from __getitem__
|
|
def test_stop_sequence(self):
|
|
class MySequenceClass(SequenceClass):
|
|
def __getitem__(self, i):
|
|
if i == 10:
|
|
raise StopIteration
|
|
return SequenceClass.__getitem__(self, i)
|
|
self.check_for_loop(MySequenceClass(20), range(10))
|
|
|
|
# Test a big range
|
|
def test_iter_big_range(self):
|
|
self.check_for_loop(iter(range(10000)), range(10000))
|
|
|
|
# Test an empty list
|
|
def test_iter_empty(self):
|
|
self.check_for_loop(iter([]), [])
|
|
|
|
# Test a tuple
|
|
def test_iter_tuple(self):
|
|
self.check_for_loop(iter((0,1,2,3,4,5,6,7,8,9)), range(10))
|
|
|
|
# Test an xrange
|
|
def test_iter_xrange(self):
|
|
self.check_for_loop(iter(xrange(10)), range(10))
|
|
|
|
# Test a string
|
|
def test_iter_string(self):
|
|
self.check_for_loop(iter("abcde"), ["a", "b", "c", "d", "e"])
|
|
|
|
# Test a Unicode string
|
|
if have_unicode:
|
|
def test_iter_unicode(self):
|
|
self.check_for_loop(iter(unicode("abcde")),
|
|
[unicode("a"), unicode("b"), unicode("c"),
|
|
unicode("d"), unicode("e")])
|
|
|
|
# Test a directory
|
|
def test_iter_dict(self):
|
|
dict = {}
|
|
for i in range(10):
|
|
dict[i] = None
|
|
self.check_for_loop(dict, dict.keys())
|
|
|
|
# Test a file
|
|
def test_iter_file(self):
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
for i in range(5):
|
|
f.write("%d\n" % i)
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
self.check_for_loop(f, ["0\n", "1\n", "2\n", "3\n", "4\n"])
|
|
self.check_for_loop(f, [])
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Test list()'s use of iterators.
|
|
def test_builtin_list(self):
|
|
self.assertEqual(list(SequenceClass(5)), range(5))
|
|
self.assertEqual(list(SequenceClass(0)), [])
|
|
self.assertEqual(list(()), [])
|
|
self.assertEqual(list(range(10, -1, -1)), range(10, -1, -1))
|
|
|
|
d = {"one": 1, "two": 2, "three": 3}
|
|
self.assertEqual(list(d), d.keys())
|
|
|
|
self.assertRaises(TypeError, list, list)
|
|
self.assertRaises(TypeError, list, 42)
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
for i in range(5):
|
|
f.write("%d\n" % i)
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
self.assertEqual(list(f), ["0\n", "1\n", "2\n", "3\n", "4\n"])
|
|
f.seek(0, 0)
|
|
self.assertEqual(list(f.xreadlines()),
|
|
["0\n", "1\n", "2\n", "3\n", "4\n"])
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Test tuples()'s use of iterators.
|
|
def test_builtin_tuple(self):
|
|
self.assertEqual(tuple(SequenceClass(5)), (0, 1, 2, 3, 4))
|
|
self.assertEqual(tuple(SequenceClass(0)), ())
|
|
self.assertEqual(tuple([]), ())
|
|
self.assertEqual(tuple(()), ())
|
|
self.assertEqual(tuple("abc"), ("a", "b", "c"))
|
|
|
|
d = {"one": 1, "two": 2, "three": 3}
|
|
self.assertEqual(tuple(d), tuple(d.keys()))
|
|
|
|
self.assertRaises(TypeError, tuple, list)
|
|
self.assertRaises(TypeError, tuple, 42)
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
for i in range(5):
|
|
f.write("%d\n" % i)
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
self.assertEqual(tuple(f), ("0\n", "1\n", "2\n", "3\n", "4\n"))
|
|
f.seek(0, 0)
|
|
self.assertEqual(tuple(f.xreadlines()),
|
|
("0\n", "1\n", "2\n", "3\n", "4\n"))
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Test filter()'s use of iterators.
|
|
def test_builtin_filter(self):
|
|
self.assertEqual(filter(None, SequenceClass(5)), range(1, 5))
|
|
self.assertEqual(filter(None, SequenceClass(0)), [])
|
|
self.assertEqual(filter(None, ()), ())
|
|
self.assertEqual(filter(None, "abc"), "abc")
|
|
|
|
d = {"one": 1, "two": 2, "three": 3}
|
|
self.assertEqual(filter(None, d), d.keys())
|
|
|
|
self.assertRaises(TypeError, filter, None, list)
|
|
self.assertRaises(TypeError, filter, None, 42)
|
|
|
|
class Boolean:
|
|
def __init__(self, truth):
|
|
self.truth = truth
|
|
def __nonzero__(self):
|
|
return self.truth
|
|
True = Boolean(1)
|
|
False = Boolean(0)
|
|
|
|
class Seq:
|
|
def __init__(self, *args):
|
|
self.vals = args
|
|
def __iter__(self):
|
|
class SeqIter:
|
|
def __init__(self, vals):
|
|
self.vals = vals
|
|
self.i = 0
|
|
def __iter__(self):
|
|
return self
|
|
def next(self):
|
|
i = self.i
|
|
self.i = i + 1
|
|
if i < len(self.vals):
|
|
return self.vals[i]
|
|
else:
|
|
raise StopIteration
|
|
return SeqIter(self.vals)
|
|
|
|
seq = Seq(*([True, False] * 25))
|
|
self.assertEqual(filter(lambda x: not x, seq), [False]*25)
|
|
self.assertEqual(filter(lambda x: not x, iter(seq)), [False]*25)
|
|
|
|
# Test max() and min()'s use of iterators.
|
|
def test_builtin_max_min(self):
|
|
self.assertEqual(max(SequenceClass(5)), 4)
|
|
self.assertEqual(min(SequenceClass(5)), 0)
|
|
self.assertEqual(max(8, -1), 8)
|
|
self.assertEqual(min(8, -1), -1)
|
|
|
|
d = {"one": 1, "two": 2, "three": 3}
|
|
self.assertEqual(max(d), "two")
|
|
self.assertEqual(min(d), "one")
|
|
self.assertEqual(max(d.itervalues()), 3)
|
|
self.assertEqual(min(iter(d.itervalues())), 1)
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("medium line\n")
|
|
f.write("xtra large line\n")
|
|
f.write("itty-bitty line\n")
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
self.assertEqual(min(f), "itty-bitty line\n")
|
|
f.seek(0, 0)
|
|
self.assertEqual(max(f), "xtra large line\n")
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Test map()'s use of iterators.
|
|
def test_builtin_map(self):
|
|
self.assertEqual(map(None, SequenceClass(5)), range(5))
|
|
self.assertEqual(map(lambda x: x+1, SequenceClass(5)), range(1, 6))
|
|
|
|
d = {"one": 1, "two": 2, "three": 3}
|
|
self.assertEqual(map(None, d), d.keys())
|
|
self.assertEqual(map(lambda k, d=d: (k, d[k]), d), d.items())
|
|
dkeys = d.keys()
|
|
expected = [(i < len(d) and dkeys[i] or None,
|
|
i,
|
|
i < len(d) and dkeys[i] or None)
|
|
for i in range(5)]
|
|
self.assertEqual(map(None, d,
|
|
SequenceClass(5),
|
|
iter(d.iterkeys())),
|
|
expected)
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
for i in range(10):
|
|
f.write("xy" * i + "\n") # line i has len 2*i+1
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
self.assertEqual(map(len, f), range(1, 21, 2))
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Test zip()'s use of iterators.
|
|
def test_builtin_zip(self):
|
|
self.assertRaises(TypeError, zip)
|
|
self.assertRaises(TypeError, zip, None)
|
|
self.assertRaises(TypeError, zip, range(10), 42)
|
|
self.assertRaises(TypeError, zip, range(10), zip)
|
|
|
|
self.assertEqual(zip(IteratingSequenceClass(3)),
|
|
[(0,), (1,), (2,)])
|
|
self.assertEqual(zip(SequenceClass(3)),
|
|
[(0,), (1,), (2,)])
|
|
|
|
d = {"one": 1, "two": 2, "three": 3}
|
|
self.assertEqual(d.items(), zip(d, d.itervalues()))
|
|
|
|
# Generate all ints starting at constructor arg.
|
|
class IntsFrom:
|
|
def __init__(self, start):
|
|
self.i = start
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
def next(self):
|
|
i = self.i
|
|
self.i = i+1
|
|
return i
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("a\n" "bbb\n" "cc\n")
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
self.assertEqual(zip(IntsFrom(0), f, IntsFrom(-100)),
|
|
[(0, "a\n", -100),
|
|
(1, "bbb\n", -99),
|
|
(2, "cc\n", -98)])
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
self.assertEqual(zip(xrange(5)), [(i,) for i in range(5)])
|
|
|
|
# Classes that lie about their lengths.
|
|
class NoGuessLen5:
|
|
def __getitem__(self, i):
|
|
if i >= 5:
|
|
raise IndexError
|
|
return i
|
|
|
|
class Guess3Len5(NoGuessLen5):
|
|
def __len__(self):
|
|
return 3
|
|
|
|
class Guess30Len5(NoGuessLen5):
|
|
def __len__(self):
|
|
return 30
|
|
|
|
self.assertEqual(len(Guess3Len5()), 3)
|
|
self.assertEqual(len(Guess30Len5()), 30)
|
|
self.assertEqual(zip(NoGuessLen5()), zip(range(5)))
|
|
self.assertEqual(zip(Guess3Len5()), zip(range(5)))
|
|
self.assertEqual(zip(Guess30Len5()), zip(range(5)))
|
|
|
|
expected = [(i, i) for i in range(5)]
|
|
for x in NoGuessLen5(), Guess3Len5(), Guess30Len5():
|
|
for y in NoGuessLen5(), Guess3Len5(), Guess30Len5():
|
|
self.assertEqual(zip(x, y), expected)
|
|
|
|
# Test reduces()'s use of iterators.
|
|
def test_builtin_reduce(self):
|
|
from operator import add
|
|
self.assertEqual(reduce(add, SequenceClass(5)), 10)
|
|
self.assertEqual(reduce(add, SequenceClass(5), 42), 52)
|
|
self.assertRaises(TypeError, reduce, add, SequenceClass(0))
|
|
self.assertEqual(reduce(add, SequenceClass(0), 42), 42)
|
|
self.assertEqual(reduce(add, SequenceClass(1)), 0)
|
|
self.assertEqual(reduce(add, SequenceClass(1), 42), 42)
|
|
|
|
d = {"one": 1, "two": 2, "three": 3}
|
|
self.assertEqual(reduce(add, d), "".join(d.keys()))
|
|
|
|
# This test case will be removed if we don't have Unicode
|
|
def test_unicode_join_endcase(self):
|
|
|
|
# This class inserts a Unicode object into its argument's natural
|
|
# iteration, in the 3rd position.
|
|
class OhPhooey:
|
|
def __init__(self, seq):
|
|
self.it = iter(seq)
|
|
self.i = 0
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
def next(self):
|
|
i = self.i
|
|
self.i = i+1
|
|
if i == 2:
|
|
return unicode("fooled you!")
|
|
return self.it.next()
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("a\n" + "b\n" + "c\n")
|
|
finally:
|
|
f.close()
|
|
|
|
f = open(TESTFN, "r")
|
|
# Nasty: string.join(s) can't know whether unicode.join() is needed
|
|
# until it's seen all of s's elements. But in this case, f's
|
|
# iterator cannot be restarted. So what we're testing here is
|
|
# whether string.join() can manage to remember everything it's seen
|
|
# and pass that on to unicode.join().
|
|
try:
|
|
got = " - ".join(OhPhooey(f))
|
|
self.assertEqual(got, unicode("a\n - b\n - fooled you! - c\n"))
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
if not have_unicode:
|
|
def test_unicode_join_endcase(self): pass
|
|
|
|
# Test iterators with 'x in y' and 'x not in y'.
|
|
def test_in_and_not_in(self):
|
|
for sc5 in IteratingSequenceClass(5), SequenceClass(5):
|
|
for i in range(5):
|
|
self.assert_(i in sc5)
|
|
for i in "abc", -1, 5, 42.42, (3, 4), [], {1: 1}, 3-12j, sc5:
|
|
self.assert_(i not in sc5)
|
|
|
|
self.assertRaises(TypeError, lambda: 3 in 12)
|
|
self.assertRaises(TypeError, lambda: 3 not in map)
|
|
|
|
d = {"one": 1, "two": 2, "three": 3, 1j: 2j}
|
|
for k in d:
|
|
self.assert_(k in d)
|
|
self.assert_(k not in d.itervalues())
|
|
for v in d.values():
|
|
self.assert_(v in d.itervalues())
|
|
self.assert_(v not in d)
|
|
for k, v in d.iteritems():
|
|
self.assert_((k, v) in d.iteritems())
|
|
self.assert_((v, k) not in d.iteritems())
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("a\n" "b\n" "c\n")
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
for chunk in "abc":
|
|
f.seek(0, 0)
|
|
self.assert_(chunk not in f)
|
|
f.seek(0, 0)
|
|
self.assert_((chunk + "\n") in f)
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Test iterators with operator.countOf (PySequence_Count).
|
|
def test_countOf(self):
|
|
from operator import countOf
|
|
self.assertEqual(countOf([1,2,2,3,2,5], 2), 3)
|
|
self.assertEqual(countOf((1,2,2,3,2,5), 2), 3)
|
|
self.assertEqual(countOf("122325", "2"), 3)
|
|
self.assertEqual(countOf("122325", "6"), 0)
|
|
|
|
self.assertRaises(TypeError, countOf, 42, 1)
|
|
self.assertRaises(TypeError, countOf, countOf, countOf)
|
|
|
|
d = {"one": 3, "two": 3, "three": 3, 1j: 2j}
|
|
for k in d:
|
|
self.assertEqual(countOf(d, k), 1)
|
|
self.assertEqual(countOf(d.itervalues(), 3), 3)
|
|
self.assertEqual(countOf(d.itervalues(), 2j), 1)
|
|
self.assertEqual(countOf(d.itervalues(), 1j), 0)
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("a\n" "b\n" "c\n" "b\n")
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
for letter, count in ("a", 1), ("b", 2), ("c", 1), ("d", 0):
|
|
f.seek(0, 0)
|
|
self.assertEqual(countOf(f, letter + "\n"), count)
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Test iterators with operator.indexOf (PySequence_Index).
|
|
def test_indexOf(self):
|
|
from operator import indexOf
|
|
self.assertEqual(indexOf([1,2,2,3,2,5], 1), 0)
|
|
self.assertEqual(indexOf((1,2,2,3,2,5), 2), 1)
|
|
self.assertEqual(indexOf((1,2,2,3,2,5), 3), 3)
|
|
self.assertEqual(indexOf((1,2,2,3,2,5), 5), 5)
|
|
self.assertRaises(ValueError, indexOf, (1,2,2,3,2,5), 0)
|
|
self.assertRaises(ValueError, indexOf, (1,2,2,3,2,5), 6)
|
|
|
|
self.assertEqual(indexOf("122325", "2"), 1)
|
|
self.assertEqual(indexOf("122325", "5"), 5)
|
|
self.assertRaises(ValueError, indexOf, "122325", "6")
|
|
|
|
self.assertRaises(TypeError, indexOf, 42, 1)
|
|
self.assertRaises(TypeError, indexOf, indexOf, indexOf)
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("a\n" "b\n" "c\n" "d\n" "e\n")
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
fiter = iter(f)
|
|
self.assertEqual(indexOf(fiter, "b\n"), 1)
|
|
self.assertEqual(indexOf(fiter, "d\n"), 1)
|
|
self.assertEqual(indexOf(fiter, "e\n"), 0)
|
|
self.assertRaises(ValueError, indexOf, fiter, "a\n")
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
iclass = IteratingSequenceClass(3)
|
|
for i in range(3):
|
|
self.assertEqual(indexOf(iclass, i), i)
|
|
self.assertRaises(ValueError, indexOf, iclass, -1)
|
|
|
|
# Test iterators with file.writelines().
|
|
def test_writelines(self):
|
|
f = file(TESTFN, "w")
|
|
|
|
try:
|
|
self.assertRaises(TypeError, f.writelines, None)
|
|
self.assertRaises(TypeError, f.writelines, 42)
|
|
|
|
f.writelines(["1\n", "2\n"])
|
|
f.writelines(("3\n", "4\n"))
|
|
f.writelines({'5\n': None})
|
|
f.writelines({})
|
|
|
|
# Try a big chunk too.
|
|
class Iterator:
|
|
def __init__(self, start, finish):
|
|
self.start = start
|
|
self.finish = finish
|
|
self.i = self.start
|
|
|
|
def next(self):
|
|
if self.i >= self.finish:
|
|
raise StopIteration
|
|
result = str(self.i) + '\n'
|
|
self.i += 1
|
|
return result
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
class Whatever:
|
|
def __init__(self, start, finish):
|
|
self.start = start
|
|
self.finish = finish
|
|
|
|
def __iter__(self):
|
|
return Iterator(self.start, self.finish)
|
|
|
|
f.writelines(Whatever(6, 6+2000))
|
|
f.close()
|
|
|
|
f = file(TESTFN)
|
|
expected = [str(i) + "\n" for i in range(1, 2006)]
|
|
self.assertEqual(list(f), expected)
|
|
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
|
|
# Test iterators on RHS of unpacking assignments.
|
|
def test_unpack_iter(self):
|
|
a, b = 1, 2
|
|
self.assertEqual((a, b), (1, 2))
|
|
|
|
a, b, c = IteratingSequenceClass(3)
|
|
self.assertEqual((a, b, c), (0, 1, 2))
|
|
|
|
try: # too many values
|
|
a, b = IteratingSequenceClass(3)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
self.fail("should have raised ValueError")
|
|
|
|
try: # not enough values
|
|
a, b, c = IteratingSequenceClass(2)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
self.fail("should have raised ValueError")
|
|
|
|
try: # not iterable
|
|
a, b, c = len
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
self.fail("should have raised TypeError")
|
|
|
|
a, b, c = {1: 42, 2: 42, 3: 42}.itervalues()
|
|
self.assertEqual((a, b, c), (42, 42, 42))
|
|
|
|
f = open(TESTFN, "w")
|
|
lines = ("a\n", "bb\n", "ccc\n")
|
|
try:
|
|
for line in lines:
|
|
f.write(line)
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
a, b, c = f
|
|
self.assertEqual((a, b, c), lines)
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
(a, b), (c,) = IteratingSequenceClass(2), {42: 24}
|
|
self.assertEqual((a, b, c), (0, 1, 42))
|
|
|
|
# Test reference count behavior
|
|
|
|
class C(object):
|
|
count = 0
|
|
def __new__(cls):
|
|
cls.count += 1
|
|
return object.__new__(cls)
|
|
def __del__(self):
|
|
cls = self.__class__
|
|
assert cls.count > 0
|
|
cls.count -= 1
|
|
x = C()
|
|
self.assertEqual(C.count, 1)
|
|
del x
|
|
self.assertEqual(C.count, 0)
|
|
l = [C(), C(), C()]
|
|
self.assertEqual(C.count, 3)
|
|
try:
|
|
a, b = iter(l)
|
|
except ValueError:
|
|
pass
|
|
del l
|
|
self.assertEqual(C.count, 0)
|
|
|
|
|
|
# Make sure StopIteration is a "sink state".
|
|
# This tests various things that weren't sink states in Python 2.2.1,
|
|
# plus various things that always were fine.
|
|
|
|
def test_sinkstate_list(self):
|
|
# This used to fail
|
|
a = range(5)
|
|
b = iter(a)
|
|
self.assertEqual(list(b), range(5))
|
|
a.extend(range(5, 10))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_tuple(self):
|
|
a = (0, 1, 2, 3, 4)
|
|
b = iter(a)
|
|
self.assertEqual(list(b), range(5))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_string(self):
|
|
a = "abcde"
|
|
b = iter(a)
|
|
self.assertEqual(list(b), ['a', 'b', 'c', 'd', 'e'])
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_sequence(self):
|
|
# This used to fail
|
|
a = SequenceClass(5)
|
|
b = iter(a)
|
|
self.assertEqual(list(b), range(5))
|
|
a.n = 10
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_callable(self):
|
|
# This used to fail
|
|
def spam(state=[0]):
|
|
i = state[0]
|
|
state[0] = i+1
|
|
if i == 10:
|
|
raise AssertionError, "shouldn't have gotten this far"
|
|
return i
|
|
b = iter(spam, 5)
|
|
self.assertEqual(list(b), range(5))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_dict(self):
|
|
# XXX For a more thorough test, see towards the end of:
|
|
# http://mail.python.org/pipermail/python-dev/2002-July/026512.html
|
|
a = {1:1, 2:2, 0:0, 4:4, 3:3}
|
|
for b in iter(a), a.iterkeys(), a.iteritems(), a.itervalues():
|
|
b = iter(a)
|
|
self.assertEqual(len(list(b)), 5)
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_yield(self):
|
|
def gen():
|
|
for i in range(5):
|
|
yield i
|
|
b = gen()
|
|
self.assertEqual(list(b), range(5))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_range(self):
|
|
a = xrange(5)
|
|
b = iter(a)
|
|
self.assertEqual(list(b), range(5))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_enumerate(self):
|
|
a = range(5)
|
|
e = enumerate(a)
|
|
b = iter(e)
|
|
self.assertEqual(list(b), zip(range(5), range(5)))
|
|
self.assertEqual(list(b), [])
|
|
|
|
|
|
def test_main():
|
|
run_unittest(TestCase)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|