条件语句的学习

这里是if...else...选择判断语句。

今天学到一个小知识点，在字符串的后面加.format方法。

if...elif...else

 1 # author:zfp
 2 
 3 age_of_zfp=38
 4 guess_age=int(input("guess age:"))
 5 if guess_age==age_of_zfp:
 6     print("yes,you got if.")
 7 elif guess_age>age_of_zfp:
 8     print("think smaller...")
 9 else:
10     print("think bigger!")

 1  1 #author:zfp
 2  2 
 3  3 #import getpass
 4  4 _username="zfp"
 5  5 _password="abc123"
 6  6 username=input("username:")
 7  7 #password=getpass.getpass("password:")
 8  8 #print(username,password)
 9  9 password=input("password:")
10 10 
11 11 if _username==username and _password==password:
12 12     print("Welcome user {name} login ...".format(name=username))
13 13 else:
14 14     print("Invalid username or password!")
15 15 
16 16 print("程序结束！")