day04-流程控制之if判断、流程控制之while循环、流程控制之for循环（含上节课复习）

上节课复习

# names=['egon','asb','wsb','lsb','csb']


# n=0
# while n < len(names):
#     print(names[n])
#     n+=1

# names=['egon','asb','wsb','lsb','csb']
# info={'name':'egon','age':18,'sex':'male'}
#
# # for k in info: #x=''age'
# #     print(k,info[k])
#
# for item in names:
#     print(item)

# for i in range(1,10):
#     print(i)

# for i in range(10): #默认的起始位置是0
#     print(i)

# for i in range(1,10,2): #1 3  5  7  9
#     print(i)

# names=['egon','asb','wsb','lsb','csb']
# for i in range(len(names)):
#     print(i,names[i])

# for i in range(5):
#     print('========>第一层: %s<=========' %i)
#     for j in range(3):
#         print('          第二层: %s' %j)

#for+break
# names=['asb','wsb','egon','lsb','csb']
# for n in names:
#     if n == 'egon':
#         break
#     print(n)

#for+continue
# names=['asb','wsb','egon','lsb','csb']
# for n in names:
#     if n == 'egon':
#         continue
#     print(n)

#for+else
# names=['asb','wsb','egon','lsb','csb']
# for n in names:
#     # if n == 'egon':
#     #     break
#     print(n)
# else:
#     print('=====>')

01 流程控制之If判断

# 语法1
# if 条件:
#     代码1
#     代码2
#     代码3
#     ...


# cls='human'
# sex='female'
# age=18
#
# if cls == 'human' and sex == 'female' and age > 16 and age < 22:
#     print('开始表白')
#
# print('end....')
#
#
# 语法2
# if 条件:
#     代码1
#     代码2
#     代码3
#     ...
# else:
#     代码1
#     代码2
#     代码3
#     ...


# cls='human'
# sex='female'
# age=38
#
# if cls == 'human' and sex == 'female' and age > 16 and age < 22:
#     print('开始表白')
# else:
#     print('阿姨好')
#
# print('end....')




# 语法3
# if 条件1:
#     代码1
#     代码2
#     代码3
#     ...
# elif 条件2:
#     代码1
#     代码2
#     代码3
#     ...
# elif 条件3:
#     代码1
#     代码2
#     代码3
#     ...
# ............
# else:
#     代码1
#     代码2
#     代码3
#     ...


#练习
# '''
# 如果：成绩>=90，那么：优秀
#
# 如果成绩>=80且<90,那么：良好
#
# 如果成绩>=70且<80,那么：普通
#
# 其他情况：很差
#
# '''
#
# score1=input('请输入你的成绩>>: ').strip()
# score=int(score1)
# if score>=90:
#     print('优秀')
# elif score>=80 and score<90:
#     print('良好')
# elif score>=70 and score<80:
#     print('普通')
# else:
#     print('很差')






n={'a':111,'b':222,'c':333,'d':444}
# for k in n.values():
#     print(k)
print(n['a'])
















# score=input('your score: ') #score='73'
# score=int(score) #score=73
# if score >= 90:
#     print('优秀')
# elif score >= 80:
#     print('良好')
# elif score >= 70:
#     print('普通')
# else:
#     print('很差')




# user_from_db='egon'
# pwd_from_db='123'
#
# user_from_inp=input('username>>>: ')
# pwd_from_inp=input('password>>>: ')
#
# if user_from_inp == user_from_db and pwd_from_inp == pwd_from_db:
#     print('login successfull')
# else:
#     print('user or password error')






#if的嵌套


# cls='human'
# sex='female'
# age=18
# is_success=False
#
# if cls == 'human' and sex == 'female' and age > 16 and age < 22:
#     print('开始表白...')
#     if is_success:
#         print('在一起')
#     else:
#         print('我逗你玩呢....')
# else:
#     print('阿姨好')
#
# print('end....')

#

#while语法,while循环又称为条件循环

# while 条件:

#     code1

#     code2

#     code3

#     ....

# user_db='egon'

# pwd_db='123'

#

# while True:

#     inp_user=input('username>>: ')

#     inp_pwd=input('password>>: ')

#     if inp_user == user_db and inp_pwd == pwd_db:

#         print('login successfull')

#     else:

#         print('user or password error')

#2 while+break:break的意思是终止掉当前层的循环,.执行其他代码

# while True:

#     print('1')

#     print('2')

#     break

#     print('3')

# user_db='egon'

# pwd_db='123'

#

# while True:

#     inp_user=input('username>>: ')

#     inp_pwd=input('password>>: ')

#     if inp_user == user_db and inp_pwd == pwd_db:

#         print('login successfull')

#         break

#     else:

#         print('user or password error')

# print('其他代码')

#3 while+continue:continue的意思是终止掉本次循环,.直接进入下一次循环

#ps:记住continue一定不要加到循环体最后一步执行的代码

# n=1

# while n <= 10: #

#     if n == 8:

#         n += 1 #n=9

#         continue

#     print(n)

#     n+=1 #n=11

02 流程控制之while循环

# while True:

#     if 条件1:

#         code1

#         code2

#         code3

#         continue #无意义

#     elif 条件1:

#         code1

#         continue #有意义

#         code2

#         code3

#     elif 条件1:

#         code1

#         code2

#         code3

#         continue #无意义

#     ....

#     else:

#         code1

#         code2

#         code3

#         continue #无意义

#while循环嵌套

user_db='egon'

pwd_db='123'

while True:

    inp_user=input('username>>: ')

    inp_pwd=input('password>>: ')

    if inp_user == user_db and inp_pwd == pwd_db:

        print('login successfull')

        while True:

            cmd=input('请输入你要执行的命令: ')

            if cmd == 'q':

                break

            print('%s 功能执行...' %cmd)

        break

    else:

        print('user or password error')

print('end....')

#while+tag

user_db='egon'

pwd_db='123'

tag=True

while tag:

    inp_user=input('username>>: ')

    inp_pwd=input('password>>: ')

    if inp_user == user_db and inp_pwd == pwd_db:

        print('login successfull')

        while tag:

            cmd=input('请输入你要执行的命令: ')

            if cmd == 'q':

                tag=False

            else:

                print('%s 功能执行...' %cmd)

    else:

        print('user or password error')

print('end....')

#while+else (***)

n=1

while n < 5:

    # if n == 3:

    #     break

    print(n)

    n+=1

else:

    print('在整个循环结束后,会进行判断:只有while循环在没有被break结束掉的情况下才会执行else中的代码')

03 流程控制之for循环

# names=['egon','asb','wsb','lsb','csb']

# n=0
# while n < len(names):
#     print(names[n])
#     n+=1

# names=['egon','asb','wsb','lsb','csb']
# info={'name':'egon','age':18,'sex':'male'}
#
# # for k in info: #x=''age'
# #     print(k,info[k])
#
# for item in names:
#     print(item)

# for i in range(1,10):
#     print(i)


# for i in range(10): #默认的起始位置是0
#     print(i)

# for i in range(1,10,2): #1 3  5  7  9
#     print(i)
#
# names=['egon','asb','wsb','lsb','csb']
# for i in range(len(names)):
#     print(i,names[i])

# for i in range(5):
#     print('========>第一层: %s<=========' %i)
#     for j in range(3):
#         print('          第二层: %s' %j)

# for+break
# names=['asb','wsb','egon','lsb','csb']
# for n in names:
#     if n == 'egon':
#         break
#     print(n)

#for+continue
# names=['asb','wsb','egon','lsb','csb']
# for n in names:
#     if n == 'egon':
#         continue
#     print(n)

#for+else
# names=['asb','wsb','egon','lsb','csb']
# for n in names:
#     # if n == 'egon':
#     #     break
#     print(n)
# else:
#     print('=====>')