python check if list contains item

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https://stackoverflow.com/questions/12934190/is-there-a-short-contains-function-fo…
Is there a short contains function for lists?
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Answer
1024edited Jul 17, 2022 at 9:26
Use:

if my_item in some_list:
...
Also, inverse operation:

if my_item not in some_list:
...
It works 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.
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https://stackoverflow.com/questions/12934190
python - Is there a short contains function for lists? - Stack Overflow
WEBOct 17, 2012 · Learn how to check if a list contains a specific item using various methods, such as in, not in, index, or __contains__. See examples, performance considerations, and alternative solutions.
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Use: if my_item in some_list: ... Also, inverse operation: if my_item not in some_list: ... It works fine for lists, tuples, sets and dic...
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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...
71
I came up with this one liner recently for getting True if a list contains any number of occurrences of an item, or False if it contains no occ...
7
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. Alternativ...
5
There is also the list method: [2, 51, 6, 8, 3].__contains__(8) # Out[33]: True [2, 51, 6, 3].__contains__(8) # Out[33]: False
1
There is one another method that uses index . But I am not sure if this has any fault or not. list = [5,4,3,1] try: list.index(2) #code fo...
python - Fastest way to check if a value exists in a list Sep 26, 2011
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Learn how to use Python to check if a list contains an item using various methods, such as in, not in, count, any, and for loop. See examples, explanations…
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One of the easiest and most Pythonic ways to check for membership in a Python list is to use the in key. Technically, the inkeyword serves two purposes: 1. To check for membership in a list, and 2. To loop over a items in a for loop In this c…
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- Naive Method. In Naive method, one easily uses a loop that iterates through all the …
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How do I check if a Python list contains an item?The Quick Answer: Use in To Check if a Python List Contains an Item One of the easiest and most Pythonic ways to check for membership in a Python list is to use the in key. Technically, the in keyword serves two purposes: In this case, we’ll use the in keyword to check if an item exists in a list.
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How to check if an element exists in a Python list?This method is a concise and effective tool for handling tasks that require both existence checks and frequency analysis within Python lists. The 'in' operator in Python is the most straightforward and idiomatic way to check if an element exists in a list.
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How do I check if an item is in a list?Here's how you can use the 'not in' operator: Another way to check if an item is in a list is by using the count () method. This method returns the number of times the specified element appears in the list. If the count is more than 0, it means the item is in the list.
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How to check if something is inside a list?This is the use case you describe: Checking whether something is inside a list or not. As you know, you can use the in operator for that: That is, finding all elements in a sequence that meet a certain condition. You can use list comprehension or generator expressions for that:
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WEBFeb 27, 2023 · Learn how to check if a list contains an element or value in Python using different methods, such as for loop, in operator, not in operator, lambda, any and count. …
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WEBLearn how to use the in keyword to determine if a specified item is present in a list in Python. See an example of checking if \"apple\" is in a fruits list and try it yourself.
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item
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WEBApr 16, 2023 · Learn different ways to check if a given element exists in list or not using python \"in\" operator, list.count() function, or custom logic. See examples, code, and …
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WEBFeb 3, 2024 · The most straightforward way to check if an element exists in a list is by using the ‘in’ operator. This operator returns True if the element is found in the list and …
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WEB18 hours ago · This Python script checks if a user-provided number exists in a predefined list. It repeatedly prompts the user to enter a number and then checks if that number is …
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WEBYou do want to check if one string from a list of strings (the file extensions) is a substring of another string (the url). – mkrieger1. Jul 3, 2021 at 17:37. 8 Answers. Sorted by: 748. …
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Check If Element Contains String
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WEBFeb 21, 2012 · How can it be done? I found https://stackoverflow.com/a/598415/292291, [x for x in myList if x.n == 30] # list of all matches. any(x.n == 30 for x in myList) # if there is …
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python - Fastest way to check if a value exists in a list	Sep 26, 2011
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