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########### Tests borrowed from or inspired by test_genexps.py ############
Test simple loop with conditional
>>> sum([i*i for i in range(100) if i&1 == 1])
166650
Test simple nesting
>>> [(i,j) for i in range(3) for j in range(4)]
[(0, 0), (0, 1), (0, 2), (0, 3), (1, 0), (1, 1), (1, 2), (1, 3), (2, 0), (2, 1), (2, 2), (2, 3)]
Test nesting with the inner expression dependent on the outer
>>> [(i,j) for i in range(4) for j in range(i)]
[(1, 0), (2, 0), (2, 1), (3, 0), (3, 1), (3, 2)]
Test the idiom for temporary variable assignment in comprehensions.
>>> [j*j for i in range(4) for j in [i+1]]
[1, 4, 9, 16]
>>> [j*k for i in range(4) for j in [i+1] for k in [j+1]]
[2, 6, 12, 20]
>>> [j*k for i in range(4) for j, k in [(i+1, i+2)]]
[2, 6, 12, 20]
Not assignment
>>> [i*i for i in [*range(4)]]
[0, 1, 4, 9]
>>> [i*i for i in (*range(4),)]
[0, 1, 4, 9]
Make sure the induction variable is not exposed
>>> i = 20
>>> sum([i*i for i in range(100)])
328350
>>> i
20
Verify that syntax error's are raised for listcomps used as lvalues
>>> [y for y in (1,2)] = 10 # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
SyntaxError: ...
>>> [y for y in (1,2)] += 10 # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
SyntaxError: ...
########### Tests borrowed from or inspired by test_generators.py ############
Make a nested list comprehension that acts like range()
>>> def frange(n):
... return [i for i in range(n)]
>>> frange(10)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Same again, only as a lambda expression instead of a function definition
>>> lrange = lambda n: [i for i in range(n)]
>>> lrange(10)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Generators can call other generators:
>>> def grange(n):
... for x in [i for i in range(n)]:
... yield x
>>> list(grange(5))
[0, 1, 2, 3, 4]
Make sure that None is a valid return value
>>> [None for i in range(10)]
[None, None, None, None, None, None, None, None, None, None]
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y = 2
vals = [(x, y) for x in range(2)]
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class C:
y = 2
vals = [(x, y) for x in range(2)]
vals = C.vals
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y = 1
class C:
y = 2
vals = [(x, y) for x in range(2)]
vals = C.vals
r� r r� r� r� r7 r8 s & r �%test_in_class_scope_inside_function_2�;ListComprehensionTest.test_in_class_scope_inside_function_2 s/ � � �� �F�F�+�,�� � � �d�Z�L� �Ar c �v � Q oQQQ,-oU O VQQ,Q5 QQQ ,-oU O VQ,Q5 P! )
a;
y = 1
class C:
global y
y = 2
# Ensure the listcomp uses the global, not the value in the
# class namespace
locals()['y'] = 3
vals = [(x, y) for x in range(2)]
vals = C.vals
r� r r r� r �r r4 �r3 r4 r� r� r7 r8 s & r � test_in_class_scope_with_global�5ListComprehensionTest.test_in_class_scope_with_global sV � �
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y = 1
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nonlocal y
y = 2
# Ensure the listcomp uses the global, not the value in the
# class namespace
locals()['y'] = 3
vals = [(x, y) for x in range(2)]
vals = C.vals
r� r r� r r r7 r8 s & r �!test_in_class_scope_with_nonlocal�7ListComprehensionTest.test_in_class_scope_with_nonlocal$ s/ � �
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items = [a for a in [1] if [a for _ in [0]]]
r r r� r7 r8 s & r �test_nested_has_free_var�.ListComprehensionTest.test_nested_has_free_var3 s+ � � �� �Q�C�.�� � � �d�W�I� �>r c �r � Q oU O UQ],-QQ,Q5 U O UQ, -Q] -Q,Q5 P! )zY
z = 1
items = [a for a in [1] if [x for x in [1] if z]]
r r r r� r� r r� r7 ra s & r �,test_nested_free_var_not_bound_in_outer_comp�BListComprehensionTest.test_nested_free_var_not_bound_in_outer_comp: sL � � ��
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items = [_C for _C in [1] for [0, 1][[x for x in [1] if _C][0]] in [2]]
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items = [(_C, [x for x in [1] if _C]) for _C in [0, 1]]
r r7 ra s & r � test_nested_free_var_in_expr�2ListComprehensionTest.test_nested_free_var_in_exprH s/ � � ��
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f = [(z, lambda y: [(x, y, z) for x in [3]]) for z in [1]]
(z, func), = f
out = func(2)
r� r� )r5 r4 r3 r7 ra s & r � test_nested_listcomp_in_lambda�4ListComprehensionTest.test_nested_listcomp_in_lambdaN s& � � ��
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(func, c), = [(a, b) for b in [1] for a in [lambda : a]]
d = func()
assert d is func
# must use "a" in this scope
e = a if False else None
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a = [1 for a in [0]]
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def b():
[a for b in [1] for _ in []]
return b, locals()
r, s = b()
x = r is b
y = list(s.keys())
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y = 0
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items3 = [("x" in dir()) for x in l]
items4 = [eval("x") for x in l]
# x is available, and does not overwrite y
[exec("y = x") for x in l]
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result = snapshot = None
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result = [{func}(value) for value in value]
except ValueError:
snapshot = value
raise
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value = ["ab"]
result = snapshot = None
try:
result = [{func}(value) for value in value]
finally:
snapshot = value
r. r/ r1 r2 r3 r4 r5 r^ r6 r8 s & r �test_comp_in_try_finally�.ListComprehensionTest.test_comp_in_try_finally� s} � � �� ���E��*�� � � �d�W�t�f�h���Z�RV�QW�$X�Y����E��*�� � � �d�W�t�f�h��j�SW�RX�$Y�%/� � 1r c �8 � Q oU O UQ]P,-2 P! )z�
value = [1, None]
try:
[v for v in value].sort()
except TypeError:
pass
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