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# mode: run
# tag: listcomp, comprehension
cimport cython
def smoketest():
"""
>>> smoketest()
[0, 4, 8]
"""
x = 'abc'
result = [x*2 for x in range(5) if x % 2 == 0]
assert x != 'abc'
return result
def list_genexp():
"""
>>> list_genexp()
[0, 4, 8]
"""
x = 'abc'
result = list(x*2 for x in range(5) if x % 2 == 0)
assert x == 'abc'
return result
def int_runvar():
"""
>>> int_runvar()
[0, 4, 8]
"""
cdef int x
print [x*2 for x in range(5) if x % 2 == 0]
cdef class A:
def __repr__(self): return u"A"
def typed():
"""
>>> typed()
[A, A, A]
"""
cdef A obj
print [obj for obj in [A(), A(), A()]]
def inferred_type():
"""
>>> inferred_type()
['A', 'A', 'A']
"""
print [cython.typeof(obj) for obj in [A(), A(), A()]]
def not_inferred_type():
"""
>>> not_inferred_type()
['Python object', 'Python object', 'Python object']
"""
print [cython.typeof(obj) for obj in [1, A(), 'abc']]
def iterdict():
"""
>>> iterdict()
[1, 2, 3]
"""
cdef dict d = dict(a=1,b=2,c=3)
l = [d[key] for key in d]
l.sort()
print l
listcomp_result = [ i*i for i in range(5) ]
def global_listcomp():
"""
>>> [ i*i for i in range(5) ]
[0, 1, 4, 9, 16]
>>> listcomp_result
[0, 1, 4, 9, 16]
"""
class ListCompInClass(object):
"""
>>> x = ListCompInClass()
>>> x.listcomp
[1, 2, 3]
"""
listcomp = [i+1 for i in range(3)]
cdef class ListCompInCClass:
"""
>>> x = ListCompInCClass()
>>> x.listcomp
[1, 2, 3]
"""
listcomp = [i+1 for i in range(3)]
def nested_result():
"""
>>> nested_result()
[[], [-1], [-1, 0], [-1, 0, 1]]
"""
result = [[a-1 for a in range(b)] for b in range(4)]
return result
def listcomp_as_condition(sequence):
"""
>>> listcomp_as_condition(['a', 'b', '+'])
True
>>> listcomp_as_condition('ab+')
True
>>> listcomp_as_condition('abc')
False
"""
if [1 for c in sequence if c in '+-*/<=>!%&|([^~,']:
return True
return False
@cython.test_fail_if_path_exists("//SimpleCallNode//ComprehensionNode")
@cython.test_assert_path_exists("//ComprehensionNode")
def sorted_listcomp(sequence):
"""
>>> sorted_listcomp([])
[]
>>> sorted_listcomp([1])
[2]
>>> sorted_listcomp([3,2,4])
[3, 4, 5]
"""
return sorted([ n+1 for n in sequence ])
@cython.test_fail_if_path_exists("//IfStatNode",
"//ComprehensionAppendNode")
@cython.test_assert_path_exists("//ComprehensionNode")
def listcomp_const_condition_false():
"""
>>> listcomp_const_condition_false()
[]
"""
return [x*2 for x in range(3) if False]
@cython.test_fail_if_path_exists("//IfStatNode",
"//ComprehensionAppendNode")
@cython.test_assert_path_exists("//ComprehensionNode")
def listcomp_const_condition_false_bool_test():
"""
>>> listcomp_const_condition_false_bool_test()
True
"""
return not [l for l in [1] if False]
@cython.test_fail_if_path_exists("//IfStatNode",
"//ComprehensionAppendNode")
@cython.test_assert_path_exists("//ComprehensionNode")
def listcomp_const_condition_false_assert():
"""
>>> listcomp_const_condition_false_assert()
"""
assert not [l for l in [1] if False]
@cython.test_fail_if_path_exists("//ComprehensionNode//IfStatNode",
"//ComprehensionAppendNode")
@cython.test_assert_path_exists("//ComprehensionNode",
"//IfStatNode")
def listcomp_const_condition_false_if():
"""
>>> listcomp_const_condition_false_if()
True
"""
if not [l for l in [1] if False]:
return True
return False
@cython.test_fail_if_path_exists("//ComprehensionNode//IfStatNode",
"//ComprehensionAppendNode")
@cython.test_assert_path_exists("//ComprehensionNode",
"//IfStatNode")
def listcomp_const_condition_false_typed_error():
"""
>>> listcomp_const_condition_false_typed_error() # doctest: +ELLIPSIS
Traceback (most recent call last):
TypeError: ...
"""
cdef str l
if not [l for l in [1] if False]:
return True
return False
@cython.test_fail_if_path_exists("//IfStatNode")
@cython.test_assert_path_exists("//ComprehensionNode",
"//ComprehensionAppendNode")
def listcomp_const_condition_true():
"""
>>> listcomp_const_condition_true()
[0, 2, 4]
"""
return [x*2 for x in range(3) if True]
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