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Accessing an item in a listAdding items to a listChecking if a list is emptyChecking whether a value is in a listConcatenating two listsCopying a list in PythonDifference between append and extend methodsDifference between sort and sortedFinding the index of an element in a listFinding the length of a listIterating from index oneLooping through listsModifying listsPrinting a list in reverse orderRemoving items from a listSorting a listUsing enumerate and zip at the same time
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Finding the index of an element in a list in Python
schedule May 21, 2023
Last updated local_offer
Tags Python
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We can find the index of an element in a list in Python using either the index(~) method or the enumerate(~) method.
Method | When to use |
|---|---|
| If the list does not contain duplicate items |
| If the list contains duplicate items |
Examples
index method
If there are no duplicate elements in the list we can use the index(~) method:
l = ['a', 'b', 'c', 'd']
1
The index(~) method only returns the position of the first occurrence of an element, hence caution is required if your list contains duplicate items.
If the element does not exist in the list we get a ValueError:
print(l.index('e'))
ValueError: 'e' is not in list
enumerate method
If there are duplicate elements in the list, we can use the enumerate(~) method:
dupe_l = ['a', 'b', 'c', 'd', 'a', 'b']
[1, 5]
If the element does not exist in the list we return an empty list:
[]
Published by Arthur Yanagisawa
Edited by 0 others
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