No.1

第一个PYTHON程序——入派仪式！

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作为经典的语言学习起手式，你绝不能错过这样的一个小程序。

print("Hello World!")

写下你的第一行PYTHON代码，执行后给你的回答。

Hello World!

你已经入坑了！

变量——给你个简单的定义

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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

注释

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#       最多不超过80个字符

’‘’ ‘’‘   多行注释

格式化字符串

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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)

if 判断

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_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!')

循环

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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