python map函数1练习

>>>ls = [i for i in range(10)]

>>>print ls

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

>>> def vv(num):
ver = "{:04}".format(num)

return ver

>>> rs = map(vv,ls)

>>> print rs

['0000', '0001', '0002', '0003', '0004', '0005', '0006', '0007', '0008', '0009']

>>> def ff(num):
val = "{:.2f}".format(num)
return val

>>> rs = map(ff,ls)

>>> print rs

['0.00', '1.00', '2.00', '3.00', '4.00', '5.00', '6.00', '7.00', '8.00', '9.00']