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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 a 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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