迭代

1.list和tuple的迭代

student_names = ['xiaoming','xiaohua','xiaohuang']

for name in student_names:
    print (name)

2.dict字典的迭代

student_score = {'xiaoming': 20, 'xiaohua': 30, 'xiaohuang': 40}

#默认是key的迭代
for key in student_score:
    print(key)

#对value的迭代
for value in student_score.values():
    print(value)


#对key，value迭代
for k,v in student_score.items():
    print(k,v)