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什么是函数,干嘛啊,怎么干。一个py程序员的视角.md
什么是函数,干嘛啊,怎么干。一个py程序员的视角.md [toc] 前言 本文参考 https://www.runoob.com/python/python functions.html 本质 math definition 这里的f 就是函数。 你给f 一点参数,f 给你返回 使用这个参数x 后的 ...
分类:其他好文   时间:2020-02-28 13:39:18    阅读次数:113
MySQL的聚合函数
MySQL的聚合函数 网站:https://www.runoob.com/mysql/mysql-functions.html 函数名功能描述 count() 计数 sum() 求和 avg() 平均值 max() 最大值 min() 最小值 等 1. count() 1.1. SELECT COU ...
分类:数据库   时间:2020-02-28 01:01:02    阅读次数:100
React报错:Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined.
React报错: 报错原因List.Item的Item写成了item,小写的i ...
分类:其他好文   时间:2020-02-27 01:15:53    阅读次数:140
ES6常用语法(二)
arrow functions (箭头函数) 函数的快捷写法。不需要 function 关键字来创建函数,省略 return 关键字,继承当前上下文的 this 关键字 // ES5 var arr1 = [1, 2, 3]; var newArr1 = arr1.map(function(x) { ...
分类:其他好文   时间:2020-02-26 01:25:55    阅读次数:82
[Javascript] Objects and Functions
What makes objects different is that we can create more of them. Every time we use the {} object literal, we create a brand new object value: let shre ...
分类:编程语言   时间:2020-02-25 19:49:14    阅读次数:82
Inheritance: For Good or For Worse
1. Subclassing Built-In Types Is Tricky Since Python 2.2, subclassing built-in types such as list or dict can be done but there is a major caveat: the ...
分类:其他好文   时间:2020-02-25 09:29:49    阅读次数:60
scipy1.3.0开始被弃用的imread,imresize,如何代替
scipy1.3.0开始被弃用的imread,imresize,如何代替 SciPy最新官方文档的说明(20190730): Functions from scipy.interpolate (spleval, spline, splmake, and spltopp) and functions ...
分类:其他好文   时间:2020-02-24 14:49:09    阅读次数:371
OpenCV004:空白图片生成与基本图形绘制
```#https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_gui/py_drawing_functions/py_drawing_functions.html#drawing-functions######... ...
分类:其他好文   时间:2020-02-22 10:06:02    阅读次数:119
内置函数的程序
官方网站:https://docs.python.org/3/library/functions.html?highlight=built 1 函数的程序 2 3 4 5 print( all([1,-5,3]) ) #如果列表全部为真则返回true 6 7 8 9 print( any([]) ) ...
分类:其他好文   时间:2020-02-20 23:48:52    阅读次数:81
Aggressive cows
Farmer John has built a new long barn, with N (2 <= N <= 100,000) stalls. The stalls are located along a straight line at positions x1,...,xN (0 <= xi ...
分类:其他好文   时间:2020-02-18 12:41:51    阅读次数:66
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