python-day6---while循环

# while 条件:
#     循环体的代码1
#     循环体的代码2
#     循环体的代码3
# count=0
# while count < 10:
#     print(count)
#     count+=1

# while True: #死循环
#     print('ok')

# while 1: #死循环
#     print('ok')



#break:跳出本层循环
# count=0
# while count < 10:
#     if count == 5:
#         break
#     print(count)
#     count+=1

#continue：跳出本次循环
#0 1 2 3 7 8 9


# count=0
# while count < 10:
#     if count >=4 and count <=6:
#         count += 1
#         continue
#     print(count)
#     count+=1


# OLDBOY_AGE=56
# while 1:
#     age=input('猜一猜年龄>>: ')
#     age=int(age)
#
#     if age > OLDBOY_AGE:
#         print('太大了')
#     elif age < OLDBOY_AGE:
#         print('太小了')
#     else:
#         print('猜对了')
#         break



# OLDBOY_AGE=56
# count=1
# while count <= 3:
#     age=input('猜一猜年龄>>: ')
#     age=int(age)
#
#     if age > OLDBOY_AGE:
#         print('太大了')
#         count+=1
#     elif age < OLDBOY_AGE:
#         print('太小了')
#         count+=1
#     else:
#         print('猜对了')
#         break





# OLDBOY_AGE=56
# count=1
# while True:
#     if count > 3:
#         print('您猜的次数超过限制')
#         break
#     age=input('猜一猜年龄>>: ')
#     age=int(age)
#
#     if age > OLDBOY_AGE:
#         print('太大了')
#     elif age < OLDBOY_AGE:
#         print('太小了')
#     else:
#         print('猜对了')
#         break
#     count += 1







# while True:
#     score = input('>>:　')
#     score = int(score)
#
#     if score >= 90:
#         print('A')
#     if score >= 80:
#         print('B')
#     if score >= 70:
#         print('C')
#     if score >= 60:
#         print('D')
#     if score < 60:
#         print('E')







# OLDBOY_AGE=56
# count=0
# while True:
#     if count > 2:
#         break
#     age=input('猜一猜年龄>>: ')
#     age=int(age)
#     if age > OLDBOY_AGE:
#         print('太大了')
#
#     if age < OLDBOY_AGE:
#         print('太小了')
#
#     if age == OLDBOY_AGE:
#         print('猜对了')
#         break
#     count += 1




补充：

while True:
    name=input('please input your name: ')
    password=input('please input your password: ')

    if name == 'egon' and password == '123':
        print('login successfull')
        while True:
            cmd=input('>>: ')
            if cmd == 'quit':
                break
            print('====>',cmd)
        break


tag=True
while tag:
    name=input('please input your name: ')
    password=input('please input your password: ')

    if name == 'egon' and password == '123':
        print('login successfull')
        while tag:
            cmd=input('>>: ')
            # if cmd == 'quit':
            #     tag=False
            #     continue
            # print('====>',cmd)

            if cmd == 'quit':
                tag=False
            else:
                print('====>',cmd)



count=0
while count < 10:
    if count == 3:
        count+=1
        continue
    print(count)

    count+=1
else:               #最后执行
    print('在最后执行，并且只有在while循环没有被break打断的情况下才执行')


优化：

ount=0
while count < 10:
    if count == 3:
        pass
    else:
        print(count)
    count+=1