字符串相加
a = "alex"
b = "wusir"
prin("a+b")字符串相乘
a = "alex"
print(a*3)import getpass
name = input("请输入你的用户名:")
password = getpass.getpass("请输入你的密码:")          #只能在cmd中运行
print(password)      
if 3>2:
    print("yes")
if 3>1
    print("yes too")a = int(input("输入一个数:"))
if a>2:
    print("hello")
else:
    print("hello world")age =20
if age < 18:
    print("too young")
elif age < 30 and age >18:
    print("也不小了")
else:
    print("还能折腾几年啊")if 50>0:
    print(666)
    if 20>0:
        print(6666)
        if 10>0:
            print(66666)
else:
    pass原文:https://www.cnblogs.com/qwe911/p/11122911.html