from test
.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)]
class IteratingSequenceClass
:
return BasicIterClass(self
.n
)
def __getitem__(self
, i
):
class TestCase(unittest
.TestCase
):
# Helper to check that an iterator returns a given sequence
def check_iterator(self
, it
, seq
):
self
.assertEqual(res
, seq
)
# Helper to check that a for loop generates a given sequence
def check_for_loop(self
, expr
, seq
):
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
):
# 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
):
self
.assertEqual(res
, TRIPLETS
)
# Test triple list comprehension using iterators
def test_nested_comprehensions_iter(self
):
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
):
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
):
raise IndexError # Emergency stop
self
.check_iterator(iter(C(), 10), range(10))
# Test two-argument iter() with function
def test_iter_function(self
):
self
.check_iterator(iter(spam
, 10), range(10))
# Test two-argument iter() with function that raises StopIteration
def test_iter_function_stop(self
):
self
.check_iterator(iter(spam
, 20), range(10))
# Test exception propagation through function iterator
def test_exception_function(self
):
self
.assertEqual(res
, range(10))
self
.fail("should have raised RuntimeError")
# Test exception propagation through sequence iterator
def test_exception_sequence(self
):
class MySequenceClass(SequenceClass
):
def __getitem__(self
, i
):
return SequenceClass
.__getitem
__(self
, i
)
for x
in MySequenceClass(20):
self
.assertEqual(res
, range(10))
self
.fail("should have raised RuntimeError")
# Test for StopIteration from __getitem__
def test_stop_sequence(self
):
class MySequenceClass(SequenceClass
):
def __getitem__(self
, i
):
return SequenceClass
.__getitem
__(self
, i
)
self
.check_for_loop(MySequenceClass(20), range(10))
def test_iter_big_range(self
):
self
.check_for_loop(iter(range(10000)), range(10000))
def test_iter_empty(self
):
self
.check_for_loop(iter([]), [])
def test_iter_tuple(self
):
self
.check_for_loop(iter((0,1,2,3,4,5,6,7,8,9)), range(10))
def test_iter_xrange(self
):
self
.check_for_loop(iter(xrange(10)), range(10))
def test_iter_string(self
):
self
.check_for_loop(iter("abcde"), ["a", "b", "c", "d", "e"])
def test_iter_unicode(self
):
self
.check_for_loop(iter(unicode("abcde")),
[unicode("a"), unicode("b"), unicode("c"),
unicode("d"), unicode("e")])
def test_iter_dict(self
):
self
.check_for_loop(dict, dict.keys())
def test_iter_file(self
):
self
.check_for_loop(f
, ["0\n", "1\n", "2\n", "3\n", "4\n"])
self
.check_for_loop(f
, [])
# 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)
self
.assertEqual(list(f
), ["0\n", "1\n", "2\n", "3\n", "4\n"])
self
.assertEqual(list(f
),
["0\n", "1\n", "2\n", "3\n", "4\n"])
# 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)
self
.assertEqual(tuple(f
), ("0\n", "1\n", "2\n", "3\n", "4\n"))
self
.assertEqual(tuple(f
),
("0\n", "1\n", "2\n", "3\n", "4\n"))
# 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)
def __init__(self
, truth
):
def __init__(self
, *args
):
def __init__(self
, vals
):
return SeqIter(self
.vals
)
seq
= Seq(*([bTrue
, bFalse
] * 25))
self
.assertEqual(filter(lambda x
: not x
, seq
), [bFalse
]*25)
self
.assertEqual(filter(lambda x
: not x
, iter(seq
)), [bFalse
]*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
.write("xtra large line\n")
f
.write("itty-bitty line\n")
self
.assertEqual(min(f
), "itty-bitty line\n")
self
.assertEqual(max(f
), "xtra large line\n")
# 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())
expected
= [(i
< len(d
) and dkeys
[i
] or None,
i
< len(d
) and dkeys
[i
] or None)
self
.assertEqual(map(None, d
,
f
.write("xy" * i
+ "\n") # line i has len 2*i+1
self
.assertEqual(map(len, f
), range(1, 21, 2))
# Test zip()'s use of iterators.
def test_builtin_zip(self
):
self
.assertEqual(zip(), [])
self
.assertEqual(zip(*[]), [])
self
.assertEqual(zip(*[(1, 2), 'ab']), [(1, 'a'), (2, 'b')])
self
.assertRaises(TypeError, zip, None)
self
.assertRaises(TypeError, zip, range(10), 42)
self
.assertRaises(TypeError, zip, range(10), zip)
self
.assertEqual(zip(IteratingSequenceClass(3)),
self
.assertEqual(zip(SequenceClass(3)),
d
= {"one": 1, "two": 2, "three": 3}
self
.assertEqual(d
.items(), zip(d
, d
.itervalues()))
# Generate all ints starting at constructor arg.
def __init__(self
, start
):
f
.write("a\n" "bbb\n" "cc\n")
self
.assertEqual(zip(IntsFrom(0), f
, IntsFrom(-100)),
self
.assertEqual(zip(xrange(5)), [(i
,) for i
in range(5)])
# Classes that lie about their lengths.
def __getitem__(self
, i
):
class Guess3Len5(NoGuessLen5
):
class Guess30Len5(NoGuessLen5
):
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
):
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.
return unicode("fooled you!")
f
.write("a\n" + "b\n" + "c\n")
# 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().
got
= " - ".join(OhPhooey(f
))
self
.assertEqual(got
, unicode("a\n - b\n - fooled you! - c\n"))
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 "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
}
self
.assert_(k
not in d
.itervalues())
self
.assert_(v
in d
.itervalues())
for k
, v
in d
.iteritems():
self
.assert_((k
, v
) in d
.iteritems())
self
.assert_((v
, k
) not in d
.iteritems())
f
.write("a\n" "b\n" "c\n")
self
.assert_(chunk
not in f
)
self
.assert_((chunk
+ "\n") in f
)
# Test iterators with operator.countOf (PySequence_Count).
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
}
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
.write("a\n" "b\n" "c\n" "b\n")
for letter
, count
in ("a", 1), ("b", 2), ("c", 1), ("d", 0):
self
.assertEqual(countOf(f
, letter
+ "\n"), count
)
# Test iterators with operator.indexOf (PySequence_Index).
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
.write("a\n" "b\n" "c\n" "d\n" "e\n")
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")
iclass
= IteratingSequenceClass(3)
self
.assertEqual(indexOf(iclass
, i
), i
)
self
.assertRaises(ValueError, indexOf
, iclass
, -1)
# Test iterators with file.writelines().
def test_writelines(self
):
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})
def __init__(self
, start
, finish
):
if self
.i
>= self
.finish
:
result
= str(self
.i
) + '\n'
def __init__(self
, start
, finish
):
return Iterator(self
.start
, self
.finish
)
f
.writelines(Whatever(6, 6+2000))
expected
= [str(i
) + "\n" for i
in range(1, 2006)]
self
.assertEqual(list(f
), expected
)
# Test iterators on RHS of unpacking assignments.
def test_unpack_iter(self
):
self
.assertEqual((a
, b
), (1, 2))
a
, b
, c
= IteratingSequenceClass(3)
self
.assertEqual((a
, b
, c
), (0, 1, 2))
a
, b
= IteratingSequenceClass(3)
self
.fail("should have raised ValueError")
a
, b
, c
= IteratingSequenceClass(2)
self
.fail("should have raised ValueError")
self
.fail("should have raised TypeError")
a
, b
, c
= {1: 42, 2: 42, 3: 42}.itervalues()
self
.assertEqual((a
, b
, c
), (42, 42, 42))
lines
= ("a\n", "bb\n", "ccc\n")
self
.assertEqual((a
, b
, c
), lines
)
(a
, b
), (c
,) = IteratingSequenceClass(2), {42: 24}
self
.assertEqual((a
, b
, c
), (0, 1, 42))
# Test reference count behavior
return object.__new
__(cls
)
self
.assertEqual(C
.count
, 1)
self
.assertEqual(C
.count
, 0)
self
.assertEqual(C
.count
, 3)
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
):
self
.assertEqual(list(b
), range(5))
self
.assertEqual(list(b
), [])
def test_sinkstate_tuple(self
):
self
.assertEqual(list(b
), range(5))
self
.assertEqual(list(b
), [])
def test_sinkstate_string(self
):
self
.assertEqual(list(b
), ['a', 'b', 'c', 'd', 'e'])
self
.assertEqual(list(b
), [])
def test_sinkstate_sequence(self
):
self
.assertEqual(list(b
), range(5))
self
.assertEqual(list(b
), [])
def test_sinkstate_callable(self
):
raise AssertionError, "shouldn't have gotten this far"
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():
self
.assertEqual(len(list(b
)), 5)
self
.assertEqual(list(b
), [])
def test_sinkstate_yield(self
):
self
.assertEqual(list(b
), range(5))
self
.assertEqual(list(b
), [])
def test_sinkstate_range(self
):
self
.assertEqual(list(b
), range(5))
self
.assertEqual(list(b
), [])
def test_sinkstate_enumerate(self
):
self
.assertEqual(list(b
), zip(range(5), range(5)))
self
.assertEqual(list(b
), [])
if __name__
== "__main__":