一、pycharm安装

https://www.cnblogs.com/dcpeng/p/9031405.html

二，代码联系

1、输入输出（明文）：

　　username = input("usrname:"）

       password = input("password:"）

　　print(username,password)

2、输入输出（暗文）：

 

import getpass ##输入的时候没有显示输入字符

 username = input("usrname:")

password = getpass.getpass("password:") print(username,password)

 

3、验证输入的账号密码是否正确：

 

_username = 'alex' _password = 'abc123' username = input("username") password = input('password:') if _username == username and _password ==password:     print("Welcome user {name} login...".format(name=username)) else:     print("Invalid username or password!")

 4、猜年龄 if else 

age_of_oldboy = 56 guess_age = int(input("guess age:"))###输入必须为整数，不让报错 if guess_age == age_of_oldboy:     print("yes,you got it.") elif guess_age > age_of_oldboy:     print("think smaller....") else:     print("think bigger!") 5、while循环

count = 0 while True:     print("count:",count)     count = count+1     if count ==100:         break 输出0-99

count = 0 while True:     if count ==3:         break     guess_age = int(input("guess age:"))     if guess_age == age_of_oldboy:             print("yes,you got it.")             break     elif guess_age > age_of_oldboy:             print("think smaller....")     else:             print("think bigger!")     count+=1

6、优化后

age_of_oldboy = 56 count = 0 while count<3:     guess_age = int(input("guess age:"))     if guess_age == age_of_oldboy:             print("yes,you got it.")             break     elif guess_age > age_of_oldboy:             print("think smaller....")     else:             print("think bigger!")     count+=1

7、for 循环

for i in range(10):     print("loop",i)

for i in range(3):     guess_age = int(input("guess age:"))     if guess_age == age_of_oldboy:             print("yes,you got it.")             break     elif guess_age > age_of_oldboy:             print("think smaller....")     else:             print("think bigger!") else:     print("you have tried too many times ..")

8、有间隔的for循环

for i in range(0,10,3):##隔三个数     print("loop",i) 输出结果

loop 0

loop 3

loop 6

loop 9

 

9、用户控制

age_of_oldboy = 56 count = 0 while count<3:     guess_age = int(input("guess age:"))     if guess_age == age_of_oldboy:             print("yes,you got it.")             break     elif guess_age > age_of_oldboy:             print("think smaller....")     else:             print("think bigger!")     count+=1     if count==3:####重点         continue_confirm = input("do you want to keep guessing?")         if continue_confirm !='n':             count =0 10、双层循环

for i in range(10):     print('--------',i)     for j in range(10):         print(j)         if j>5:             break