# 声明一个变量name用来存储一个字符串'apollo'

name = 'apollo'

# 声明一个变量age用来存储一个数字20

age = 20

# 在控制台打印变量name中存储的字符串和变量age中存储的数字

# 打印结果:apollo 20

print(name,age)

# 在控制台打印字符串"name"和"age"

print('name','age')

# 打印结果:name age

username = input('please input your username :')

password = input('please input your password :')

print('当前登录用户:', username, password)

please input your username :apollo

please input your password :111111

当前登录用户: apollo 111111

# == , != , <= , >= , < , >  逻辑运算符

print(1 == 1)               # True

print(1 == 2)               # False

print(1 == "")             # False

print(1 != 2)               # True

print(1 != 1)               # False

print(1 <= 2)               # True

print(1 >= 2)               # False

print(1 < 2)                # True

print(1 > 2)                # False

print(1 == 1 and 2 == 2)      # True

print(1 == 1 and 1 == 2)      # False

print(2 == 1 and 1 == 2)      # False

print(1 == 1 or 2 == 2)      # True

print(1 == 1 or 1 == 2)      # True

print(2 == 1 or 1 == 2)      # False

print(not 1 == 1)              # False

print(not 1 == 2)              # True

##1 如果if跟随的条件为真,那么执行属于if中的语句

if 1 == 1:

    print("1==1真的")

##2 如果if跟随的条件为假,那么不执行属于if的语句,然后寻找else,执行属于else中的语句

if 1 == 2:

    print("假的")

else:

    print("1==2假的")

##3 如果if条件不成立,会进行第二次判断elif,如果elif条件成立,则执行属于elif中的语句,如不成立则else

if 1 == 2:

    print("1==2")

elif 1 == 1:

    print("1==1")

else:

    print("全是骗人的")    

##4 for循环

for i in range(10):

    # 当i为5时,停止当次循环回到最开始继续循环

    if i == 5:

        continue

    # 当i为7时,停止全部循环

    if i == 7:

        break

    # 打印结果: 0,1,2,3,4,6

    print(i)

##5 死循环

a = 0

sum = 0

while a < 10:

    a += 1

    sum += a

print(sum)

while True:

    username = input("username:")

    password = input("password:")

    if username == "apollo" and password == "":

        print("successful")

        break

    else:

        continue