摘要： 1. chr is to get the character, ord can get the order(unicode)chr(11035)=chr(0x2B1B)='\u2B1B' black square; 2B1A white squareint('2B1B',16)=11035 2. s 阅读全文

摘要： 1. from timeit import timeit计算程序运行时间 比如： timeit(list(range(1000))) 2. if we using jupyter it will keep ranning for many times and giving the average t 阅读全文

摘要： Topology1. toplology is to describe connectivity between spatial features, which is a collection of rules that coupled with a set of editing tools and 阅读全文