A detailed description of the usage of the enumerate function in Python

This article describes how to use the enumerate function in Python. the enumerate function is used to traverse elements in a sequence and their subscript. it is mostly used to get counts in a for loop. the enumerate parameter is a variable that can be traversed, such as string and list

In general, if you want to traverse both the index and element of a list or array, write as follows:

for i in range (0,len(list)):   print i ,list[i]

However, this method is somewhat cumbersome. it is more straightforward and elegant to use the built-in enumerrate function. let's take a look at the definition of enumerate:

def enumerate(collection):   'Generates an indexed series: (0,coll[0]), (1,coll[1]) ...'      i = 0    it = iter(collection)    while 1:    yield (i, it.next())    i += 1

Enumerate combines an array or list into an index sequence. This makes it easier to obtain the index and index content as follows:

for index，text in enumerate(list):   print index ,text

Code Example 1:

i = 0seq = ['one', 'two', 'three']for element in seq:    print i, seq[i]    i += 1

0 one

1 two

2 three

Code Example 2:

seq = ['one', 'two', 'three']for i, element in enumerate(seq):    print i, seq[i]

0 one

1 two

2 three

Code Example 3:

for i,j in enumerate('abc'):    print i,j

0

1 B

2 c

The above is a detailed description of the enumerate function usage in Python. For more information, see other related articles in the first PHP community!