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)