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  • Python第一天

    一、变量
    # print("hello world")
    # age=18
    # #定义一个变量,会有2个特征:id,type,value
    # print(id(age),type(age),age)(查看变量的类型)
    # name="egon"
    # print(id(name),type(name),name)

    #变量的命名方式:
    # 1.驼峰体
    # AgeOfolaboy=73
    # 2下划线
    # age_of_oldboy=73

    #常量(大写方式)
    # AGE_OF_OLDBOY=73
    # #AGE_OF_OLDBOY=71
    # print(AGE_OF_OLDBOY)

    二、用户与程序交互
    #!/usr/bin/env python
    #coding:utf-8(python2解决raw_input报错,在文档第一行写coding:utf-8)
    #在Python3中,无论输入何种类型,都会存成字符串类型
    # name=input('please input your name:')
    # print(id(name),type(name),name)
    #在python2中,raw_input与Python3的input一样
    # name=raw_input('please input your name:')
    # print (id(name),type(name),name)
    #python2中input,用户必须输入值,输入的是什么类型,就存成什么类型
    # name=input('please input your name:')
    # print (id(name), type(name), name)

    三、基本数据类
    #数字类

    #int整型类型:身份证号,QQ号,等级等;只能存一个值,没有顺序,不可变
    #age=18 #age=int(18)
    #float浮点型:身高,体重,薪资等;存一个值,没有顺序,不可变
    #height=1.81
    # height=float(1.81)
    # print(type(height),height)

    #字符串类型:把一堆字符放到单引号或者双引号或者三引号中
    #表示一些描述性的状态,比如人的名字,性别
    # name="egon"#(注意用英文字符)
    # print(type(name))
    #
    # comment='''
    # 老男孩的Alex,买了一辆车,然而。。。
    # '''
    #msg="i'm ok"

    #字符串拼接:
    #1只能字符串之间拼接
    #2字符串之间只能用+或者*
    # name='egon'
    # msg='hello'
    # age=18
    # print(name+msg+str(age))
    # print(name*10)


    #列表:定义在【】内,用逗号分隔开的多个元素,每个元素可以是任意类型
    #用来表示存取多个值,比如人的爱好,人的信息
    # hobbies=['play', 'read','music','movie']
    # print(hobbies [0])
    # print(hobbies [3])

    # l=[1,1.3,'ha',['a','b']]
    # print(l[3][1])

    # id name sex hobbies
    # info=[1311221994,'ling','male',['music','read']]
    # print(info[1])

    #字典:定义在{}内,用key=value形式表示一个元素,用逗号隔开
    # info={'id':1311221994,'name':'ling','sex':'male','hobbies':['music','read']}
    # print(info['name'])
    # print(info['hobbies'][1])

    #布尔类型
    #print(type(True))
    # AGE=72
    # age=18
    # print(age>AGE)
    # print(age<AGE)

    #bool值:所有的数据类型都自带bool值
    #bool值为假的情况:1、对于数字来说0的时候为假。2、空列表、空集合、空字符串。。。。为假3、none
    x=1
    print(bool(x))
    if x:
    print('ok')


    四、格式化输出
    #my name is ***,my age is ***

    # name=input('user_name:')
    # age=input('user_age:')
    #print('my name is %s,my age is %s'%(name,age))相当于print('my name is %s,my age is %s'%('ling','23'))
    #print('my name is %s,my age is %s'%('ling',23))%s占位符可以接收字符串str与整型的int
    print('my name is %s,my age is %d'%('ling',23))%d占位符只可以接收整型的int
    五、基本运算符
    # a=10
    # b=3
    # print(a+b)
    #print(a/b)#真正的除法,有整数有余数
    #print(a//b)#地板除,只有整数
    # print(a%b)
    # print(a*b)

    #比较运算
    #age=23
    # print(age>70)
    # print(age<70)
    # print(age!=70)
    # print(age==70)

    #赋值运算
    # height=180
    # height+=1#height=height+1
    # print(height)


    #逻辑运算
    # name='ling'
    # age=23
    # print(name=='ling1' and age>20)
    # print(name=='ling2' or age>20)

    age=11
    print(not age>5)
    六、流程控制之if...else语句
    # age=input('输入年龄:')
    # age=int(age)
    # if age>30:
    # print('叫阿姨')
    # else:
    # print('叫美女')

    # sex=input('sex>>:')
    # age=int(input('age>>:'))
    # is_pretty = True
    # if sex == 'female'and age>18 and age<30 and is_pretty == True:
    # print('表白中')
    # else:
    # print('叫阿姨')


    # sex=input('sex>>:')
    # age=int(input('age>>:'))
    # is_pretty = bool(input('is pretty:'))
    # if sex == 'female'and age>18 and age<30 and is_pretty == True:
    # print('表白中')
    # else:
    # print('叫阿姨')



    #if嵌套
    # sex=input('sex>>:')
    # age=int(input('age>>:'))
    # is_pretty = bool(input('is pretty:'))
    # success=True#(满足条件1的情况下,打印在一起)False(满足条件1的情况下,打印去你妈的爱情)
    # if sex == 'female'and age>18 and age<30 and is_pretty == True:#(条件1)
    # if success:
    # print('在一起')
    # else:
    # print('去你妈的爱情')
    # else:
    # print('叫阿姨')

    #if多分支
    # score=int(input('your score>>:'))
    # if score>=90:
    # print('优秀')
    # elif score>=80:
    # print('良好')
    # elif score>=70:
    # print('及格')
    # else:
    # print('太差')



    # name=input('please input your name:')
    # password=input('please input your password:')
    # if name=='ling' and password=='123':
    # print('登陆成功')
    # else:
    # print('用户名或密码错误')


    # '''
    # ling -管理员
    # mei - 职员
    # zhang,liu- 主管
    # 其他 - 普通用户
    # '''
    # name=input('输入用户名:')
    # if name=='ling':
    # print('管理员')
    # elif name=='mei':
    # print('职员')
    # elif name=='zhang'or name=='liu':
    # print('主管')
    # else:
    # print('普通用户')


    # today=input('>>:')
    # if today in ['Monday','Tuesday','Wednesday','Thursday','Friday']:
    # print('上班')
    # elif today in ['Saturday','Sunday']:
    # print('出去浪')
    # else:
    # print('''必须输入其中一种:
    # Monday
    # Tuesday
    # Wednesday
    # Thursday
    # Friday
    # Saturday
    # Sunday''')
    七、流程控制之while循环
    # AGE_OF_OLDBOY=73
    # guess=int(input('>>:'))
    # if guess > AGE_OF_OLDBOY:
    # print('太大了,往小里猜')
    # elif guess < AGE_OF_OLDBOY:
    # print('太小了,往大里猜')
    # else:
    # print('恭喜你,猜对了')

    #while:条件循环
    # while 条件:
    # 循环体
    # count=0
    # while count<3:
    # print('loop',count)
    # count+=1

    #break跳出本层循环(打印0-100)
    # count=0
    # while True:
    # if count>100:
    # break
    # print(count)
    # count+=1

    # #continue:跳出本次循环(打印1-10,7不打印)
    # count=0
    # while count <= 10:
    # if count == 7:
    # count+=1
    # continue
    # print(count)
    # count+=1

    #while+else
    # count=0
    # while count <=10:
    # if count==3:
    # break
    # print(count)
    # count+=1
    # else:
    # print('while正常结束了,没有被break打断,才会执行这里')
    #注意一
    # count=0
    # while count <=5:
    # print(count)
    # count+=1
    # #continue加到这里没有意义

    #注意二
    #用户登陆,输入正确用户密码可直接登陆,输入错误3次则退出
    # name='ling'
    # password='123'
    # count=0
    # while count<3:
    # u=input('输入用户名:')
    # p=input('输入登陆密码:')
    # if u == name and p == password:
    # print('登陆成功')
    # break
    # else:
    # print('用户名或密码错误')
    # count+=1




    #同上
    name='ling'
    password='123'
    count=0
    while True:
    if count == 3:
    break
    u=input('输入用户名:')
    p=input('输入登陆密码:')
    if u == name and p == password:
    print('登陆成功')
    break
    else:
    print('用户名或密码错误')
    count+=1

    #登陆后可以操作命令
    # name='ling'
    # password='123'
    # count=0
    # while True:
    # if count == 3:
    # break
    # u=input('输入用户名:')
    # p=input('输入登陆密码:')
    # if u == name and p == password:
    # print('登陆成功')
    # while True:
    # cmd=input('>>:')
    # if cmd == 'quit':
    # break
    # print('run%s'%cmd)
    # break
    # else:
    # print('用户名或密码错误')
    # count+=1

    #同上
    # name='ling'
    # password='123'
    # count=0
    # tag=True
    # while tag:
    # if count == 3:
    # break
    # u=input('输入用户名:')
    # p=input('输入登陆密码:')
    # if u == name and p == password:
    # print('登陆成功')
    # while tag:
    # cmd=input('>>:')
    # if cmd == 'quit':
    # tag=False
    # continue
    # print('run%s'%cmd)
    #
    # else:
    # print('用户名或密码错误')
    # count+=1
     
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  • 原文地址:https://www.cnblogs.com/lingmei/p/7483047.html
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