030901 if else 流程判断

EXAMPLE_01

import getpass

_username = "alex"

_password = "123"

username = input("username: ")

password = getpass.getpass("password: ")

print(username, password)

# Pycharm 不支持 getpass 密码的密文

# 流程控制，逻辑判断

if _username == username and _password == password:

   print("Welcome user {name} login...".format(name = username))

else:

   print("Invalid username or password")

# 强制索引，省掉结构符

print('dddd')    # print 前不可以有空格，会出现缩进错误

EXAMPLE_02

age_of_oldboy = 56

guess_age = int(input("guess age: "))           # input 输入默认为字符串

if guess_age == age_of_oldboy:

   print(" yes, you got it.")

elif guess_age > age_of_oldboy:

   print(" think smaller...")

else:

   print(" think bigger! ")

# 物质带来的欲望，满足感最多半年，然后又会变成常态，然后就会想要更多

# 你以为你拥有了物质，其实是物质拥有了你，因为你变成了它的奴隶