Python & file operation mode create/read/write/append mode https://docs.python.org/3/library/functions.html#open #!/usr/bin/env python3 # coding: utf8 __author__ = 'xgqfrms' __editor__ = 'vscode' __version__ = '1.0.1' __copyright__ = """…

file.open(name[,mode[,buffering]]) 模式的类型有: r 默认只读 w     以写方式打开,如果文件不存在则会先创建,如果文件存在则先把文件内容清空(truncate the file first)a     以追加模式打开 (从 EOF 开始, 必要时创建新文件)用seek也无用.打开的文件也是不能读的.r+     以读写模式打开,如果文件不存在则报错,文件可读可写,可写到文件的任何位置w+    以读写模式打开 (参见 w ),和r+不同的是,它会trun…

字典是另一种可变容器模型,且可存储任意类型对象. 字典的每个键值(key=>value)对用冒号(:)分割,每个对之间用逗号(,)分割,整个字典包括在花括号({})中 ,格式如下所示: d = {key1 : value1, key2 : value2 } 键必须是唯一的,但值则不必. 值可以取任何数据类型,但键必须是不可变的,如字符串,数字或元组. 一个简单的字典实例: dict = {'Alice': '2341', 'Beth': '9102', 'Cecil': '3258'} 也可如此…

mysql http://www.cnblogs.com/zhangzhu/archive/2013/07/04/3172486.html 1.连接到本机上的MYSQL.首先打开DOS窗口,然后进入目录mysql\bin,再键入命令mysql -u root -p,回车后提示你输密码.注意用户名前可以有空格也可以没有空格,但是密码前必须没有空格,否则让你重新输入密码. 例1:建立一个名为xhkdb的数据库   mysql> create database xhkdb; py-mysql http…

NumPy Reference: Indexing Integer array indexing Boolean array indexing Note: The expression a < mean produces a boolean array, like: [[False, False, True, False, False, False, True, True, True], [True, True, False, False, True, True, False, True, Tr…

Comparison of the different algorithms for  Polygon Boolean operations. Michael Leonov 1998 http://www.angusj.com/delphi/clipper.php#screenshots http://www.complex-a5.ru/polyboolean/comp.html http://www.angusj.com/delphi/clipper.php#screenshots Intro…

A Product by Mixed Dimensions What is BooleanRT? BooleanRT is a real-time 3D boolean operations extension for Unity that allows you from executing 3D Boolean operations (Union, Intersection, Substract) during runtime or during level creation and edit…

From: http://interactivepython.org/courselib/static/pythonds/Introduction/GettingStartedwithData.html Built-in Collection Data Types Python has a number of very powerful built-in collection classes. Lists, strings, and tuples are ordered collections…

35. In python, file operation syntax is similar to c. open(file,'r',……) //the first parameters is necessary, other is optional ,the second parameters is 'r' by default if you want to open a file, you can use: f = open('//Users//wyg_mac//Desktop//Acco…

Boolean operations between triangle meshes eryar@163.com Abstract. Boolean operations is one of basic and well known on 3D models. The operations are widely used in computer graphics, game, CAD, EDA. The blog introduce the function in some open sourc…