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Mr.Li's Blog

1. 首页
2. 
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3. 技术专栏
4. Python进阶

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9个相关结果

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Python进阶 | 技术专栏

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Python之if嵌套

如何用if嵌套描述考试成绩评价规则： 1. 如果成绩大于等于60分，就是及格，在此前提下： (1)如果成绩大于等于80分，属于优秀范围； (2)否则，属于一般范围。 2. 如果成绩小于60分，就是不及格，在此前提下： (1)如果成绩小于30分，平时太不认真，属于学渣了； (2)如果成绩大于等于30分，那么，至少 …

Mr.Li
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2019年5月13日 0
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0
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3.07 k

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Python进阶

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Python之冒号和缩进

在开发中你可能注意到了一个细节：在条件判断代码中的冒号:后、下一行内容的前面，会空几个格，但这是为什么呢？ 首先，在计算机的沟通语言中，空格的学名叫缩进，比如我们写文章都要空两个格，这就叫首行缩进。 对于Python而言，冒号和缩进是一种语法。它会帮助Python区分代码之间的层次，理解条件执行的逻辑及先后顺序 …

Mr.Li
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2019年5月13日 0
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3
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5.01 k

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Python进阶

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Python条件判断

比方说，我想让天猫精灵在感知到我开门的一瞬间，打开客厅的灯。如果我只说：天猫精灵，打开灯。那么，由于缺少开门的前提条件，无论你开不开门，灯都会打开着。 所以，我们下的命令应该是这样：天猫精灵，如果我开门，你就打开客厅的灯。 而这个下命令的如果…就…逻辑，就是与计算机沟通的逻辑——条件判断，其作用就是明确地让计算 …

Mr.Li
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2019年5月12日 0
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0
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3.4 k

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Python进阶

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Python之数据转换

负责转换数据类型的函数一共有3种：str()、 int()和float()。 下面，我们先来学习一下str()函数，它拥有镜像世界的『隐分身术』，可让其他类型的数据分身成str类型。 str()函数 str()函数能将数据转换成其字符串类型，不管这个数据是中文、数字、标点还是火星文，只要放到括号里。这 …

Mr.Li
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2019年5月10日 0
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3.31 k

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Python进阶

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Python之数据的应用

现在，你已经认识了字符串、整数、浮点数，掌握了它们的初级使用，下面我们来学以致用一下。 四则运算 Python里的整数、浮点数和数学意义的整数、小数是一样的，它最重要的作用是与运算符号结合，进行数学计算。接下来我们看一下Python如何利用整数，浮点数进行四则运算。 首先，我们来看看Python世界的运算符。 …

Mr.Li
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2019年5月10日 0
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2.84 k

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Python进阶

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Python之有意思的【0.55+0.3】

浮点数可能让你有点眩晕，这是因为，与【整数运算结果永远精确】的特点不同，计算机里浮点数的运算是不精确的，会有四舍五入的误差。这什么意思呢？ 下面，请你先心算一道题【0.55+0.3】 然后我们再让Python算一下： 哎？为什么不是【0.85】，而尾巴多了一个【1】呢？这是因为，Python计算浮点数时，会先把 …

Mr.Li
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2019年5月9日 0
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3.57 k

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Python进阶

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Python之数据类型

python世界可以看作部分现实世界的【镜像】，部分现实世界的东西、概念都可在python世界里找到对应，比如：现实世界中最常见的数字，文字，符号在Python世界就是：【数据】。 不同类型的数据呀，『长相』不一样，各司其职。只有认清各类型数据的『长相』，了解它们的功能，才能在镜像世界里完成现实世界的任务。 在 …

Mr.Li
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2019年5月9日 0
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2.92 k

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Python进阶

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Python之print()函数与变量

print()函数 恭喜你已经步入了python新世界，让我们使用print()开启对python的第一声问候！Print()函数的用法有以下几种：单枪匹马——不带引号、搭配单引号、搭配双引号、搭配三引号，我们逐个见识下吧！ 无引号 注意，这里的括号一定要用【英文括号】，不然会报错 print(520) 刚才， …

Mr.Li
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2019年5月9日 0
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4
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4.37 k

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Python进阶

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Python入门

· 首先来个要干仗的比喻 如果说编程语言是我们在新世界冒险中必备的武器，Python和Java、C、C++比起来，功能大概是这样的……   它的强大之处在于： （1）它背后有着最庞大的免费“代码库”，给初学者足够的资源搞实现自己想要的功能。 （2）它是人工智能、大数据分析的重要支持语言。 （ …

Mr.Li
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2019年5月8日 2
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6.03 k