python enumerate函数用法

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

print ‘============‘
seq = [‘one‘, ‘two‘, ‘three‘]
for i, element in enumerate(seq):
    print i, seq[i]
    
print ‘============‘
for i,j in enumerate(‘abc‘):
    print i,j
#0 a
#1 b
#2 c

print ‘============‘
def _treatment(pos, element):
    return ‘%d: %s‘ %(pos, element)

seq = [‘one‘, ‘two‘, ‘three‘]
print [_treatment(i, e1) for i, e1 in enumerate(seq)]