Let’s learn about looping techniques using functions like enumerate, zip, sorted, reversed in python.

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Looping techniques:

Python’s for statement iterates over the items of any sequence (a list or a string), in the order that they appear in the sequence.

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Looping techniques

1. Looping through the sequence using enumerate():

When looping through a sequence like a list, tuple, range object, strings the position index and corresponding value can be retrieved at the same time using the enumerate() function.


**enumerate**(_iterable_, _start=0_)

Return an enumerate object. iterable must be a sequence, an iterator, or some other object which supports iteration. The_ __next__()_ method of the iterator returned by _enumerate()_ returns a tuple containing a count (from start which defaults to 0) and the values obtained from iterating over iterable.

Looping through the list using enumerate():

Example 1:

Looping through the list using the enumerate() function returns a tuple containing count and value from the iterable. By default, the count starts from 0.

for i in enumerate(l):
    print (i)

(0, 'red')
(1, 'green')
(2, 'blue')

Example 2:

for i,j in enumerate(l):
    print (i,j)

0 red
1 green
2 blue

Example 3:

The start is mentioned as 5. So count starts from 5 while looping through the iterable.

for i in enumerate(li,5):
    print (i)

(5, 'red')
(6, 'green')
(7, 'blue')

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Looping Techniques in Python
1.45 GEEK