Enumerate枚举

Enumerate()---BIF

主要是对一个元祖或者是一个列表,既要打印元素又要打印索引时使用.

Definition :enumerate(iterable[, start])

Type : Function of__builtin__ module

enumerate(iterable[, start])-> iterator for index, value of iterable

Return an enumerate object.iterable must be another object that supports iteration. The enumerate objectyields pairs containing a count (from start, which defaults to zero) and avalue yielded by the iterable argument. enumerate is useful for obtaining anindexed list:

(0, seq[0]), (1, seq[1]),(2, seq[2]), ...





例子:

a = [a,b,c]

for i,v inenumerate(a):

print I,v

>>> for i, season inenumerate(['Spring', 'Summer', 'Fall', 'Winter']):

...print(i, season)

0 Spring

1 Summer

2 Fall

3 Winter