• day03总结


    一. 基本数据类型
    # 1、整型int
    # 作用:记录年龄、等级、号码等状态
    # 定义与使用
    # age = 999
    # level = 10
    # qq = 383838338

    # res=age * 1
    # print(age != 10)


    # 2、浮点型float
    # 作用:记录薪资、身高、体重等状态
    # 定义与使用
    # salary=3.3
    # print(salary,type(salary))

    # print(3.3 + 1)
    # print(3.3 >= 1)


    # print("abc" > 1) # 不能混用


    # 二、字符串str
    # 作用:记录一些描述性的状态,比如名字、性别、消息等等
    # 定义与使用:在双引号内或者单引号内或三引号内(''''''、"""""")定义的一组字符称之为字符串
    # msg="一行白鹭上青天"
    # msg1 = '一行白鹭上青天'
    # msg2 = '行一白鹭上青天'
    # msg3 = '行 1&*一白鹭上青天'
    # msg4 = '行'
    # print(msg4,type(msg4))

    # msg5="""
    # aaa
    # bbbb
    # cccc
    # """
    # print(type(msg5))


    # 引号的嵌套
    # msg="my name is 'egon'"
    # print(msg)


    # gender="male"
    # gender=1
    # gender=0

    # 了解:字符串类型也可以进行数学运算以及比较运算,但仅限于字符串类型之间进行
    # 数学运算:字符串只能做+、*
    # print("abc"+" "+"def") # 字符串的相加是一个拼接操作,效率极低
    # print("abc"*10)
    # print("#"*50)
    # print('hello')
    # print("#"*50)

    # 三:列表list: 索引对应值,索引从0开始
    # 作用:按顺序存放多个值,并且能够按顺序取出来单独的一个值
    # 定义与使用:在[]内用逗号分隔开多个任意类型的值
    # hobbies = "play music read"

    # 0 1 2
    # egon_hobbies = ["play","music","read"]
    # print(egon_hobbies[0])
    # print(egon_hobbies[1])
    # print(egon_hobbies[2])
    # print(egon_hobbies[-1])

    # 0 1 2 3
    # l = [111, 333.3333, "abc", [444444, 5555, 66666,["aaa","bbbb"]]]
    # print(l[2])
    # print(l[3][0]) # [444444, 5555, 66666][0]
    # print(l[3][-1]) # [444444, 5555, 66666][0]

    # print(l[3][3][0])

    # 练习题1:存放一个人信息(名字、年龄、多个爱好)
    # egon_info = ["egon", 18, ["play", "movie"]]
    # 练习题2:存放多个人信息(名字、年龄、多个爱好)
    # info = [
    # ["egon1", 18, ["play", "movie"]],
    # ["egon2", 19, ["read"]],
    # ]
    # print(info[1][2][0])

    # names=["egon","张三","李四"]
    # salaries=[1.1,2.2,3.3]

    # 0 1 2
    # info=["egon",18,"male",19,10,11,12]
    # print(info[-1])


    # 四:字典
    # 作用:存放多个值,用key对应值,key通常为字符串类型
    # 定义与使用:在{}内用逗号分隔开多个key:value,其中value可以是任意类型
    # info={"name":"egon","age":18,"gender":"male","hobbies":["play","music"]}
    # print(info["name"])
    # print(info["age"])

    # print(info["hobbies"][1])

    # 练习题:存放多个人信息(名字、年龄、多个爱好)
    # info = [
    # {
    # "name": "egon1",
    # "age": 18,
    # "level": 10,
    # "hobbies": ["play", "movie"]
    #
    # },
    # {
    # "name": "egon2",
    # "age": 19,
    # "level": 11,
    # "hobbies": ["read"]
    # },
    # ]
    #
    # print(info[1]["level"])


    # 五:布尔类型,只有两个值True和False
    # 可以自己定义布尔值
    # tag=True
    # print(tag,type(tag))

    # 通过是通过比较运算得到布尔值的
    # print(10 > 3)
    # print("egon" == "egon")

    # 布尔值用于条件


    二. 输入输出
    # 1、python3中input功能会把用户输入的任意内容都存成字符串类型
    # 接收用户的输入
    # inp_name=input("请输入您的账号名>>>: ") # "egon123*"
    # print(inp_name,type(inp_name))

    # 注意1:
    # inp_age=input("请输入您的年龄>>>: ") # "18"
    # inp_age=int(inp_age) # int会把纯数字的字符串转换成int型
    # print(inp_age+1) # "18"+1

    # 注意2:
    # inp_pwd=input("请输入您的密码>>>: ") # "123"
    # print(inp_pwd == 123) # "123" == 123
    # print(inp_pwd == "123") # "123" == "123"

    # 注意3:无论输啥,都存成字符串
    # x=input(">>>: ") # "[1,2,3]"
    # print(x,type(x))

    # 了解(**):
    # 2、python2中raw_input功能与python3中的input功能一模一样

    # 3、python2中input功能


    # 格式化输出
    # print('login successfull')
    # name=input('your name: ')
    # age=input('your age: ')
    # print("my name is %s my age is %s" %(name,age))


    # print("my name is %s" % "egon")
    # print("my name is %s my age is %s" % ("egon", 18))
    # print("my name is %s my age is %s" % ("egon", [1,2,3]))


    三. 基本运算符
    1.算术运算符
    # 算数运算符通常用于数字类型之间进行,但是+号和*比较特殊
    # +和*可以用于其他类,但是仅限于同种类型直之间进行
    # print(10 / 3)
    # print(10 // 3)
    # print(10 % 3) # 取余数,取模
    # print(10 ** 2)


    # 了解知识(**)
    # 特殊:+ *
    # l1=[1,2,3]
    # l2=[4,5,6]
    # print(l1 + l2)
    # print(l1*3)

    # 2、比较运算符
    # 比较运算符通常用于数字之间进行
    # print(10 == 10)
    # print(10 == "10")
    # print(10 != "10") # True

    # 了解(*)
    # print("abz" > "abcdef") # True

    # l1=[1,'abc',18]
    # l2=["a",'abc',18]
    # l1 > l2 # 报错,对应位置的值必须是同种类型才可以

    # l1=[1,'abc',18,111,222,333]
    # l2=[2,'abc',18]
    # print(l2 > l1)


    # 3、赋值运算符
    # age = 18
    # # age += 1 # age = age + 1
    # # print(age)
    #
    # age *= 100 # age = age * 100
    # print(age)

    # 4、逻辑运算符
    # not: 把布尔值结果取反
    # print(not 10 > 3)
    # print(not "egon" == "egon")
    # print(not True)
    # print(not False)

    # and:用来链接左右两个条件
    # 左右两个条件同时为True,最终结果才为True
    # print(10 > 3 and 3 == 3)
    # print(10 > 33 and 3 == 3)
    # print(False and True)

    # or:用来链接左右两个条件
    # 左右两个条件但凡有一个结果为True,最终结果就为True
    # print(False or True)
    # print(True or True)
    # print(False or False)
    # print(10 > 33 or False)


    # 短路行为=》偷懒行为
    # 10 < 3 and 1 == 1
    # False or 1 == 1
    # True or 1 == 1


    # 优先级:not > and > or
    # 推荐用()区分优先级
    # (True and 1 == 1) or (not "egon" == "egon") or ("aaa" == "aaa" and 1 <= 3)

    # res = True and 1 == 1 or not "egon" == "egon" or "aaa" == "aaa" and 1 <= 3
    # (True and 1 == 1) or not "egon" == "egon" or ("aaa" == "aaa" and 1 <= 3)
    # print(res)




  • 相关阅读:
    数据流图
    数据库设计
    多媒体基础知识
    面向对象程序设计
    UML建模
    warning: integer overflow in expression [Woverflow]
    unmatched/skipped datagrams
    MFC
    D3DWindower
    cheatengine
  • 原文地址:https://www.cnblogs.com/Knge/p/13038007.html
Copyright © 2020-2023  润新知