01 of lenrning python

我也打算开始写博客啦！记录一下自己的学习过程~

01密文登陆

这个在vscode中不显示密文

在cmd中看不到密码

 # -*- coding: utf-8 -*-

 import getpass

 name = input("please input your name:")
 password = getpass.getpass('please put in your password:')
 if name == "xb" and password == "":
     print("welcome!")
 else:
         print("you have put in the wrong information!")
 print(name, password)

02各种变量的空值

数值	digital = 0
字符串	str = "" 或 str = ”
列表	list = []
字典	ditc = {}
元组	tuple= ()

03占位符

（1）%

tpl = "i am %s" % "alex"

tpl = "i am %s age %d" % ("alex", 18)
tpl = "i am %(name)s age %(age)d" % {"name": "alex", "age": 18}
tpl = "percent %.2f" % 99.97623
tpl = "i am %(pp).2f" % {"pp": 123.425556, }
tpl = "i am %.2f %%" % {"pp": 123.425556, }

（2）Format

tpl = "i am {}, age {}, {}".format("seven", 18, 'alex')

tpl = "i am {}, age {}, {}".format(*["seven", 18, 'alex'])

tpl = "i am {0}, age {1}, really {0}".format("seven", 18)

tpl = "i am {0}, age {1}, really {0}".format(*["seven", 18])

tpl = "i am {name}, age {age}, really {name}".format(name="seven", age=18)

tpl = "i am {name}, age {age}, really {name}".format(**{"name": "seven", "age": 18})

tpl = "i am {0[0]}, age {0[1]}, really {0[2]}".format([1, 2, 3], [11, 22, 33])

tpl = "i am {:s}, age {:d}, money {:f}".format("seven", 18, 88888.1)

tpl = "i am {:s}, age {:d}".format(*["seven", 18])

tpl = "i am {name:s}, age {age:d}".format(name="seven", age=18)

tpl = "i am {name:s}, age {age:d}".format(**{"name": "seven", "age": 18})

tpl = "numbers: {:b},{:o},{:d},{:x},{:X}, {:%}".format(15, 15, 15, 15, 15, 15.87623, 2)

tpl = "numbers: {:b},{:o},{:d},{:x},{:X}, {:%}".format(15, 15, 15, 15, 15, 15.87623, 2)

tpl = "numbers: {0:b},{0:o},{0:d},{0:x},{0:X}, {0:%}".format(15)

tpl = "numbers: {num:b},{num:o},{num:d},{num:x},{num:X}, {num:%}".format(num=15)

04登陆交互程序

 # -*- coding: utf-8 -*-

 print("----------welcome---------")
 i = 0
 LockedName = ""
 name = ""
 while i < 3:
     name = input("please input your name:")
     password = input('please put in your password:')
     if name == LockedName:
             print("You have been locked")
     if name == "xb" and password == "":
         print("-----------------")
         print("welcome!")
         print("name:%s,\npassword:%s" % (name, password))
         exit()
     else:
         print("try again")
     if i == 2:
         LockedName = name
         print("your account has been locked!!!")
     i = i + 1