一、python第一行代码：
1 name = "你好，世界"2 print(name)
二、变量：
1 name = "SunDM12"2 name2 = name3 print("my name : ",name, name2)4 5 name = "wangba"6 print(name, name2)name前后变化，而name2 = name已经将“SunDM12”赋值给了name2，name变化后，name2不再变化
三、交互：
1 username = input("username ： ")2 print(username)input函数：用户可以在界面上显示输入字符，并赋值给了username
1 name = input("name :") 2 age = input("age :") 3 job = input("job :") 4 salary = input("salary :") 5 6 info = ''' 7 ------ info of %s ------ 8 name : %s 9 age : %s10 job : %s11 salary : %s12 '''%(name, name, age, job, salary)在屏幕打印的第一种格式。
%s是字符串；%d是双精度；%f是浮点型
1 info2 = '''2 ------- info of {_name} -------3 name : {_name}4 age : {_age}5 job : {_job}6 salary : {_salary}7 '''.format(_name=name,8 _name=name,_age=age,_job=job,_salary=salary)在屏幕打印的第二种格式。
1 info3 = '''2 ------ info of {0} ------3 name : {0}4 age : {1}5 job : {2}6 salary : {3}7 '''.format(name,age,job,salary)在屏幕打印的第三种格式。
四、登陆密码：
1 import getpass 2 3 _username = 'SunDM12' 4 _password = '123456' 5 6 username = input('username :') 7 password = input('password :') 8 print(username,password) 9 10 if _username == username and _password == password11 print("welcome user {name} login...".format(name = username))12 else:13 print("Invalid username or password!")其中getpass是一个package，提供可移植的面膜输入
1. getpass.getpass()
2. getpass.getuser()
五、猜密码游戏
1 correct_number = 122 guess_number = int(input("guess number:"))3 4 if correct_number == guess_number:5 print("yes,you got it...")6 elif guess_number >correct_number:7 print("think smaller...")8 else:9 print("think bigeer...")其中input函数输入是一个字符，此时要将其强制转换为整型
5.1 while循环
1 count = 02 while True:3 print("count :",count)4 count = count +15 if count == 1000:6 break其中break表示跳出整个循环
correct_number = 12count = 0while count<3:
guess_number = int(input("guess number:"))if correct_number == guess_number:print("yes,you got it...")elif guess_number >correct_number:print("think smaller...")else:print("think bigeer...")
count + = 1else:print("you have tried too many times.")利用while循环进行设计猜数字游戏
5.2 for循环
1 for i in range(10):2 print("loop ",i)显示1到10
1 for i in range(0,10,2):2 print("loop :",i)2是步长
correct_number = 12for i in range(3):
guess_number = int(input("guess number:"))if correct_number == guess_number:print("yes,you got it...")elif guess_number >correct_number:print("think smaller...")else:print("think bigeer...")else:print("you have tried too many times.")利用for循环进行猜数字游戏
5.3 continue和break的区别
1 for i in range(10): 2 if i<5: 3 print("loop",i) 4 else: 5 continue 6 print("....") 7 8 for i in range(10): 9 print('-------',i)10 for j in range(10):11 print(j)12 if j>5:13 breakcontinue忽略当前语句，继续执行下一行
break跳出当前执行的整个循环
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