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Added difference in range() between Python 2 and 3 (#20629)

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Added the differences between the working methods of the range() function in Python 2 and 3, including the explanation of the "lazy" method of generating a list of numbers.
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Pravin Pratap
2018-11-01 09:41:43 +05:30
committed by Christopher McCormack
parent 4e92b01111
commit c056fc18dd
1 changed files with 8 additions and 0 deletions
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guide/english/python/range-function/index.md
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@@ -39,3 +39,11 @@ for i in range(3, 12, 2):
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``` ```
#### Notes
In Python 2, there are 2 functions for going through a range of numbers: range() and xrange().
Out of these functions, xrange() is the "lazy" function, meaning it generates numbers as necessary instead of actually creating
a list of numbers and iterating through them. range(), on the other hand, makes an entire list of numbers and iterates through
this list. This makes it a strain on the memory in the case of really long lists.
In Python 3, the range() function mimics xrange() as the "lazy" variant, and xrange() itself has been removed.