I see people are using
any to gather another list to see if an item exists in a list, but is there a quick way to just do?:
if list.contains(myItem): # do something
You can use this syntax:
if myItem in list: # do something
Also, inverse operator:
if myItem not in list: # do something
It's work fine for lists, tuples, sets and dicts (check keys).
Note that this is an O(n) operation in lists and tuples, but an O(1) operation in sets and dicts.
In addition to what other have said, you may also be interested to know that what
in does is to call the
list.__contains__ method, that you can define on any class you write and can get extremely handy to use python at his full extent.
A dumb use may be:
>>> class ContainsEverything: def __init__(self): return None def __contains__(self, *elem, **k): return True >>> a = ContainsEverything() >>> 3 in a True >>> a in a True >>> False in a True >>> False not in a False >>>