标签：标识 input pre 名称 conf 数据 注释 span blog
1、python起手式
写下第一个代码，打印‘hello world’
print(‘hello world‘)
2、变量
变量是为了存储信息，在程序中被调用，标识数据名称或类型。
变量定义的规则：
变量名只能是字母，数字或下划线的任意组合
变量名的第一个字符不能是数字
关键字不能生命为变量
为了方便读取等，变量命名一般都遵循变量本身的意义，如名字命名为name，年龄为age等等。
name = "Laay" #字符串类型string age = 21 #int类型 province = "shandong" NameOfTwinsGf = "hanmeimei" name_of_twins_gf = "hanmeimei" address = “shanghai” address1 = address address = “beijing” #address1 赋的是值，而不是变量，所以不变
3 注释
# 单行注释，最多不超过80个字符
‘‘‘ ‘‘‘ 多行注释
4 格式化字符串
name = input("input your name:") age =int( input("input your age:")) job = input("input your job:") print("name is :",name) print("age is :",age) print("job is :",job) msg = ‘‘‘ infomation of user %s: ----------------------------- name: %s age : %d job : %s ----------------------------- ‘‘‘ % (name,name,age,job) print(msg)
5 if else条件
_username = ‘Laay’ _password = ‘Laay’ username = input(‘input your name :‘) password = input(‘input your password:‘) if _username == username and _password == password: print(‘login..‘) else: print(‘username or password is correct...‘) age = 22 guess_num = int(input(‘input your num:‘)) if guess_num == age : print(‘congratulations! you got it.‘) elif guess_num >age: print(‘think smaller!‘) else: print(‘think bigger!‘)
6 while 循环
age = 22 counter = 0 for i in range(10) if counter<3: guess_num = int(input(‘input your num:‘)) if guess_num == age : print(‘congratulations! you got it.‘) break elif guess_num >age: print(‘think smaller!‘) else: print(‘think bigger!‘) else: continue_confirm = input(‘Do you want to contnue because you are stupid:‘) if countinue_confirm == ‘y‘ counter = 0 ciontinue else: print(‘bye‘) break count + = 1
标签：标识 input pre 名称 conf 数据 注释 span blog
原文地址：http://www.cnblogs.com/laay/p/6413057.html
