• 编码

ASCII --> GB --> GBK --> utf-8

• 第一个程序

hello world

• 输密码

#Author:Elson Zeng
import getpass
_username = 'jian'
_passwd = '123'
username = input("username:")
passwd = input("passwd:")

if _passwd == passwd and _username == username:
    print ('welcome user {name} login'.format(name=username))
else:
    print ('Invalid username or passwd!')

• while and for 循环

#Author:Elson Zeng

age_of_oldboy = 56

count = 0
for i in range(3):
    guess_age = int(input('guess age:'))
    if guess_age == age_of_oldboy:
        print ('you guess ture!')
        exit()
    elif guess_age > age_of_oldboy:
        print ('you guess big')
    else:
        print ("you guess small")
    count += 1
else:
    print('you guess too many times,fuck off~!')