Python enumerate() function

description##

The enumerate() function is used to combine a traversable data object (such as a list, tuple or string) into an index sequence, and list data and data subscripts at the same time. It is generally used in a for loop.

Python 2.3. and above are available, and 2.6 adds the start parameter.

grammar###

The following is the syntax of the enumerate() method:

enumerate(sequence,[start=0])

parameter###

return value###

Return an enumerate (enumeration) object.

Examples##

The following shows an example of using the enumerate() method:

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

Ordinary for loop##

>>> i =0>>> seq =['one','two','three']>>>for element in seq:... print i, seq[i]... i +=10 one 1 two 2 three

for loop using enumerate

>>> seq =['one','two','three']>>>for i, element inenumerate(seq):... print i, element 
0 one 1 two 2 three

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