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class="article_intro">python基本数据类型的概念和使用</div><div class="article_content article_contentheight"> <link rel="stylesheet" href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/kdoc_html_views-1a98987dfd.css"> <link rel="stylesheet" href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/ck_htmledit_views-044f2cf1dc.css"> <div id="content_views" class="htmledit_views"> <p>##基本概念及基本数据类型<br> ##<br> ##数学计算符<br> ## +加－减 *乘 /除 //整除 %余数 **幂指数<br> ##<br> ##变量：存放数据类型及函数对象<br> ##<br> ##使用变量来存放<a href="https://so.csdn.net/so/search?q=%E5%AD%97%E7%AC%A6%E4%B8%B2&spm=1001.2101.3001.7020" target="_blank" class="hl hl-1" data-report-view="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=%E5%AD%97%E7%AC%A6%E4%B8%B2&spm=1001.2101.3001.7020","extra":"{\"searchword\":\"字符串\"}"}" data-report-click="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=%E5%AD%97%E7%AC%A6%E4%B8%B2&spm=1001.2101.3001.7020","extra":"{\"searchword\":\"字符串\"}"}" data-tit="字符串" data-pretit="字符串">字符串</a>及数值<br> x=16 <br> y=4<br> z=12</p> <p>##以后只更改x,y,z数值即可<br> ##<br> print('猪肉:',x)<br> print('西兰花:',y)<br> print('辣椒:',z)<br> ##<br> ##买菜<br> print(2*15+1*6+2*12) #花费了60元<br> print(2*x+1*y+2*z) #用变量运算<br> ##<br> ##解决<br> ##变量，帮我们减少代码的复杂性，增强可读性<br> ##不管用户输入什么都不会影响我们提前写好的代码<br> ##<br> ##变量的命名<br> ##命名：采用驼峰命名法，字母开头（小写），下划线结尾name_list<br> ##<br> ##name='liangji'<br> ##name_list=很多名字，为了区分<br> ##<br> ##原则<br> ##1、第一个字母必须是字母或者下划线</p> <p>name='梁积'<br> _name='小梁'<br> print(name,_name)</p> <p>##2、支持中文作为变量名，不规范。不建议，首选英文，abcd<br> ##<br> 年龄=18<br> print(年龄)<br> ##<br> ##3、命名规范，可以看词读意<br> ##<br> book='python基础'<br> age=18<br> number=3<br> print(book,age,number)<br> ##<br> ##4、不可以以数字和符号开头，除‘_’下划线以外<br> ##+name=4<br> ##print(+name) #报错，不可以<br> ##<br> ##5、不可以，以《关键字》和《内置函数》作为变量<br> ##关键字和内置，python的工具，它们在python中有着特殊的意义和用法。<br> ##<br> print() #输出函数，内置函数，功能：打印输出<br> ##<br> ##print=2<br> ##print('print') #print失去了打印的功能，它相对于数值2了<br> ##<br> #print(dir(_builtins_)) #查看所有的内置函数<br> ##<br> ##import keyword #导入keyword 关键字模块（查看所有的关键字）<br> ##print(keymord.kwlist) #kwlist 查看所有的关键字<br> ##<br> ##如何区分那些是关键字那些是内置函数？<br> ##<br> ##颜色区分：<br> ##<br> ##if pass and as 橙色<br> ##print type 紫色<br> ##<br> ##变量的赋值<br> ##分三种：<br> ##<br> ##单个变量赋值<br> ##a=1<br> ##<br> ##多个变量赋值<br> ##a=b=c=1 #将1同时赋值给a、b、c三个变量<br> ##<br> ##多变量指定赋值<br> ##a,b,c=1,2,3<br> ##<br> ##变量在赋值时存在垃圾回收<br> ##a=1<br> ##a=2<br> ##print(a) #只会出现2<br> ##<br> ##输入函数input<br> ##输入函数就是接收我们自己输入的值，然后再使用。输入时还可以给用户提示语<br> ##<br> ##可加可不加<br> ##用input提示用户输入一个数字<br> ##<br> num=input('请输入一个数字：')<br> print(num)<br> print(type(num)) #str 字符串<br> ##<br> ##注意:输入函数接收到的任何值都是一个字符串<br> ##<br> ##input函数在使用时会阻塞代码的运行，回车不给值或都输入值结束它的阻塞<br> ##<br> a=input()<br> ##<br> ##数值类型用法<br> ##<br> ##四个内置函数（类型转换函数）：str(),int(),float(),bool()<br> ##str()：类型转换成字符串<br> ##int()：类型转换成整型<br> ##float()：类型转换成浮点型<br> ##bool()：类型转换成布尔型<br> ##<br> ##整型和浮点型之间的转换：int(),float()<br> ##<br> a=float(1)<br> print(a)<br> b=int(1.53) #非四舍五入的值，直接忽略小数位<br> print(b)<br> c=float(int(1.23)) #结果为小数1.0<br> print(c)<br> ##<br> ##bool <br> ##存在即为True,不存在即为Fasle<br> print(bool('梁积')) #True<br> print(bool('')) #False<br> ##<br> ##字符串和数值如何转换<br> ##约束：只有数字类型的字符串才可以转换成数值类型的值<br> ##<br> a=int('1') #字符串1转成整型<br> print(a)<br> print(type(a))<br> b=float('1') #字符串1转成浮点型<br> print(b)</p> <p>##c=float('1.123')<br> ##d=int('1.55') #字符串小数类型的值不能转整型<br> ##<br> ##input()'123'-->123, 123+23<br> ##<br> num=int(input('请输入一个数值:')) #'123'<br> print(num+23)<br> ##<br> ##数值转字符串，没有约束，可以随意转换<br> ##a=str(1)</p> </div><div data-report-view="{"mod":"1585297308_001","spm":"1001.2101.3001.6548","dest":"https://blog.csdn.net/m0_66722163/article/details/122871083","extend1":"pc","ab":"new"}"><div></div></div> <div><div><span>声明：</span>本文内容由网友自发贡献，不代表【wpsshop博客】立场，版权归原作者所有，本站不承担相应法律责任。如您发现有侵权的内容，请联系我们。转载请注明出处：<a href="https://www.wpsshop.cn/w/Cpp五条/article/detail/645474">https://www.wpsshop.cn/w/Cpp五条/article/detail/645474</a></div></div></div><div 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