A simple method for python to obtain list subscript and its value

The following is a simple method for python to obtain the list subscript and its values. I think this is quite good. now I will share it with you and give you a reference. Let's take a look at the following method when traversing a sequence in python:

for item in sequence:    process(item)

If you want to get the position of an item, you can write as follows:

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

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

enumerate(sequence,start=0)

In the above functions, sequence is an iteratable object, which can be a list, dictionary, and file object. Enumerate returns a triple 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 example at the beginning of the article can be written as follows:

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

The simple way to obtain the list subscript and its value in the above python article is to share all the content with you. I hope to give you a reference and support for PHP.

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