A simple way to get the list subscript and its value in python

When traversing a sequence in python, we usually use the following method:

for item in sequence:
    process(item)

If you want to get the position of a certain item , you can write like this:

for index in range(len(sequence)):
    process(sequence[index])

Another better way is to use python’s built-in enumerate function:

enumerate(sequence,start=0)

In the above function, sequence is an iterable object, which can be a list, dictionary, file object, etc. enumerate returns a tuple consisting of subscript and item:

>>> seasons = ['Spring', 'Summer', 'Fall', 'Winter']
>>> list(enumerate(seasons)) [(0, 'Spring'), (1, 'Summer'), (2, 'Fall'), (3, 'Winter')]
>>> list(enumerate(seasons, start=1)) [(1, 'Spring'), (2, 'Summer'), (3, 'Fall'), (4, 'Winter')]

The first example of the article can be written like this:

for index,item in enumerate(sequence):
    print index,item

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