Indexing in Python
Looking into it in our thread today is NOT python datatype but the key feature we use on a datatype to achieve predetermined objectives.
You can access a single item of a Python sequence (such as a string, tuple, or list) with the corresponding integer index.
Indexing in Python is zero-based. This means the index 0 corresponds to the first (leftmost) item of a collection, 1 to the second item, and so on.
Python index is positive when you start your indexing from the first left items of say a list.
Examples.
Commenters =[1, 2, 3, 4, 5] Python List
[0, 1, 2, 3, 4] Positive Indexing
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Engagers =[ 1, 2, 3, 4, 5] Python List
[- 5, — 4, — 3, — 2, — 1] Negative Indexing
Let’s go practical. Say i want to replace 1 in Commenters with some other values. I can simple do that by using indexing to call the number and reassign other values to it thus.
Input
Commenters [0] = [ ‘Monday’, ‘Tuesday’, ‘ Wednesday’, ‘Thursday’, ‘Friday’]
Output
Commenters = [ [ ‘Monday’, ‘Tuesday’, ‘ Wednesday’, ‘Thursday’, ‘Friday’] , 2, 3, 4, 5]
You can use indexing to modify the items of the mutable sequence such as list as I have done above.
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