in

Description

Returns a Boolean stating whether the object is in the container.

Syntax

A [not] in B

A

Any valid object.

B

Any valid object.

Return Value

#TODO

Time Complexity

O(1) for dict O(1) to O(n) for sets O(n) for sequences (str, list, tuple)

Remarks

When used with dictionaries checks the keys instead of values.

Example

>>> 'A' in 'ABCD'
True
>>> 0 in [0, 1, 2]
True
>>> 0 not in {'a': 0, 'b': 1}
True

See also

#TODO