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# pylint: disable=missing-docstring,invalid-name,no-absolute-import
import functools
# Don't do this, use a comprehension instead.
assert map(lambda x: x*2, [1, 2, 3]) == [2, 4, 6] # [deprecated-lambda]
assert filter(lambda x: x != 1, [1, 2, 3]) == [2, 3] # [deprecated-lambda]
# It's still ok to use map and filter with anything but an inline lambda.
double = lambda x: x * 2
assert map(double, [1, 2, 3]) == [2, 4, 6]
# It's also ok to pass lambdas to other functions.
assert functools.reduce(lambda x, y: x * y, [1, 2, 3, 4]) == 24
# Or to an undefined function or one with varargs
def f(*a):
return len(a)
f(lambda x, y: x + y, [1, 2, 3])
undefined_function(lambda: 2) # pylint: disable=undefined-variable
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