流程控制之for循环

for循环主要用于循环取值

student=【'summer'，'dream'，'cold'】

i=0

while i <len(students):

    print (student[1])

    i+=1

for item in student:

    print(item)

for item in 'hello'

    print(item)

dic={'x','444','y','333','z','555'}

for k in dic:

    print(k,dic[k])

for i in range(1,10,3):

    print(i)

for i in range(10):

    print(i)

student=['summer','dream','cold']

for item in student:

    print(item)

for i in range(len(student)):

    print(i,student[i])