python切片与迭代

# L=['php','python','c++']# print(L[0:3])#slice标示符0到3但不包括3# print(L[:3])#0可以省略# L=list(range(100))# print(L[:10:2])# print(L[1:10:2])# print(L[-20:-1:5])#迭代d={'a':1,'b':2,'c':3}for key in d:    print(key)for key in d.values():    print(key)for key,v in d.items():    print(key,v)from collections import Iterable#查看是否可迭代对象print(isinstance('abd',Iterable))for i,value in enumerate(['A','B','C']):#将list下标循环    print(i,value)