Python Object Graphs - objgraph 1.7.2 documentation Python Object Graphs¶ objgraph is a module that lets you visually explore Python object graphs. You'll need graphviz if you want to draw the pretty graphs. I recommend xdot for interactive use. pip…

今天在生产系统中查询产品时,莫名提示错误:maximum recursion depth exceeded while calling a Python object,根据错误日志提示,发现在查询产品时,系统会构造一个domain,查询所有库位的库存量.当仓库较多的时候,构造的这个domain比较长,然后解析这个domain的方法distribute_negate是递归调用,因为递归次数太多,所以就提示错误. 根据源码查看了生成domain的条件,这个部分不太好调整,所以后来直接找了个方法来增加…

2019-10-21 19:01:00 [scrapy.core.engine] INFO: Spider opened2019-10-21 19:01:00 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)2019-10-21 19:01:00 [scrapy.extensions.telnet] INFO: Telnet console l…

pickle - Python object serialization  消息队列…

1. Creating class class className: 'Optional class documentation string' class_suite The class has a documentation string, which can be accessed via ClassName.__doc__. Example: class Employee: 'Common base class for all employees' empCount = 0 def __…

动态语言的对象属性 既然都是动态语言,自然python和熟知的JavaScript很像,建一个空对象用来存放所有的数据,看看js: var data = {}; data.name = 'CooMark'; data.age = 30; 但是在python中这样却不行,说好的动态属性呢? data = object() data.name = 'CooMark' # AttributeError: 'object' object has no attribute 'name' 但是像下面这样又是…

In JS, we have object spread opreator: const x = { a: '1', b: '2' } const y = { c: '3', d: '4' } const z = { ...x, ...y } // z = {a: '1', b: '2', c: '3', d: '4'} In python we can do: x = {'a': 1, 'b': 2} y = {'b': 3, 'c': 4} z = {**x, **y} // z= {'c'…

JXPath 除了可以 XPath 语法访问 JavaBeans.DOM/JDOM,也可以对其属性赋值. 以下面的 JavaBeans 为例. package com.huey.jxpath; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data @NoArgsConstructor @AllArgsConstructor public class Book { p…

class Song(object): def __init__(self,lyrics): self.lyrics = lyrics def sing_me_a_song(self): for line in self.lyrics: print line happy_bday = Song(["happy birthday to you "," I dont want to get sued","so i'll stop right there&quo…

这个应为写得,写得蛮啰嗦的,建议耐心的人看看:http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html 知乎:http://www.zhihu.com/question/19754936 新式类,不学也没关系.看了一堆,没一个人正面回答这个问题,就是建议看文档.先不管它1…