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  • python - Find a value in a list - Stack Overflow
    Another alternative: you can check if an item is in a list with if item in list:, but this is order O(n) If you are dealing with big lists of items and all you need to know is whether something is a member of your list, you can convert the list to a set first and take advantage of constant time set lookup :
  • python - Fastest way to check if a value exists in a list - Stack Overflow
    Get their indices if values exist in a list On the other hand, if you want to check if values exist in a list and return the indices of the values that do, then regardless of the length of the list, for small number of values, directly searching for it using list index() in a try-except block is the fastest way to do it In particular, if you
  • Check if something is (not) in a list in Python - Stack Overflow
    Apart from that, as the other answers have noted, not in is the correct syntax to check if an object is in a list (or any container really) For example: # check if `my_tuple` is not in `my_list` my_tuple not in my_list
  • Is there a short contains function for lists? - Stack Overflow
    The list method index will return -1 if the item is not present, and will return the index of the item in the list if it is present Alternatively in an if statement you can do the following: if myItem in list: #do things You can also check if an element is not in a list with the following if statement: if myItem not in list: #do things
  • python - Using any() and all() to check if a list contains one set of . . .
    in the case of any, at least one value is truthy A value x is falsy iff bool(x) == False A value x is truthy iff bool(x) == True Any non-boolean elements in the iterable are perfectly acceptable — bool(x) maps, or coerces, any x according to these rules: 0, 0 0, None, [], (), [], set(), and other empty collections are mapped to False
  • python - Checking if any elements in one list are in another - Stack . . .
    Also, the title of the question has been edited to make it a different question than was originally asked The original question by @h1h1, as interpreted by most who answered it, was to identify if one list contains any of the same elements of another list The question has been changed to check if one list contains all elements of a second list
  • python - Test if a variable is a list or tuple - Stack Overflow
    This type of check does have some good use-cases, such as with the standard string startswith endswith methods (although to be accurate these are implemented in C in CPython using an explicit check to see if it's a tuple - there's more than one way to solve this problem, as mentioned in the article you link to)
  • How to check if a string contains an element from a list in Python
    The difference is, I wanted to check if a string is part of some list of strings whereas the other question is checking whether a string from a list of strings is a substring of another string Similar, but not quite the same and semantics matter when you're looking for an answer online IMHO


















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