一、概述: 在引用计数的基础上,还可以通过“标记-清除”(mark and sweep)解决容器对象可能产生的循环引用的问题。无论使用何种语言开发,无论开发的是何种类型,何种规模的程序,都存在这样一点相同之处。即:一定比例的内存块的生存周期都比较短,通常是几百万条机器指令的时间,而剩下的内存块,起生存周期比较...【阅读全文】
def hanshu(n): sumn = 0 m = n for dix in range(1,4): m = m % 10 sumn = sumn + m ** 3 m = n // 10 if sumn == n: print(n,end = " ") def hanshu1(): for b in range(1,1000): hanshu(b) hanshu1() ...【阅读全文】
Linear: Runs a list of tasks/flows, one after the other in a serial manner.Unordered: Runs a set of tasks/flows in any order, usually run in parallel manner and have no dependencies between tasks.Graph: Runs a graph (set of nodes and edges between those nodes) c...【阅读全文】
一、问题 官网下载Python2.7(python-2.7.13.msi),安装后启动提示错误,ImportError: No module named site 二、解决 1、这个问题是Python环境变量错误引起的,一般是之前安装过Python,卸载后没把环境变量去掉。 2、或者安装Python时选择了最下面一项,把Pthon加入环境变量,但它默认设置PYTHONHOME=C:\Python27,但...【阅读全文】