【global statement】

　　在线程里，默认所有变量都是本线程局部变量，要想访问全局变量，则要先用global声明。

　　如全局有变量totalCount，线程中有语句 totalCount += 1，运行时会报错，totalCount未赋值。此时在赋值语句前加上global totalCount声明即可。

global statement的更多相关文章

  1. Python之global

    1 Global The global statement and its nonlocal cousin are the only things that are remotely like dec ...

  2. 关键字local、global和内置函数【locals、globals】

    每个函数都有着自已的命名空间,叫做局部名字空间,它记录了函数的变量,包括函数的参数和局部定义的变量.每个模块拥有它自已的命名空间,叫做全局命名空间,它记录了模块的变量,包括函数.类.其它导入的模块.模 ...

  3. Python Scopes and Namespaces

    Before introducing classes, I first have to tell you something about Python's scope rules. Class def ...

  4. [Python] Symbol Review

    From:http://learnpythonthehardway.org/book/ex37.html 1. with X as Y: pass 1.1 yield 2. exec 2.1 name ...

  5. Think Python - Chapter 11 - Dictionaries

    Dictionaries A dictionary is like a list, but more general. In a list, the indices have to be intege ...

  6. adaptive hash index

    An optimization for InnoDB tables that can speed up lookups using = and IN operators, by constructin ...

  7. Python Tutorial 学习(九)--Classes

    ## 9. Classes 类 Compared with other programming languages, Python's class mechanism adds classes wit ...

  8. 【转】Multithreaded Python Tutorial with the “Threadworms” Demo

    The code for this tutorial can be downloaded here: threadworms.py or from GitHub. This code works wi ...

  9. haproxy 关闭ssl 3.0 加密

    global log 127.0.0.1 local3 maxconn 65535 chroot /usr/local/haproxy uid 500 gid 500 daemon ssl-defau ...

随机推荐

  1. python2.7中出现TypeError: must be type, not classobj

    class Person: def __init__(self,name,age): self._name = name self._age = age class Student(Person): ...

  2. ubuntu 查看系统是32位还是64位

    查看cpu信息 cat /proc/cpiinfo 查看ubuntu版本: cat /etc/issue 查看系统是32位还是64位 方法1: #查看long的位数,返回32或64 getconf L ...

  3. 学学Gearman

    通常,多语言多系统之间的集成是个大问题,一般来说,人们多半会采用WebService的方式来处理此类集成问题,但不管采用何种风格的WebService,如RPC风格,或者REST风格,其本身都有一定的 ...

  4. python 简单的单例模式日志模块

    # -*- coding: utf-8 -*-import logging def singleton(cls): instance = {} def _singleton(*args, **kw): ...

  5. pip 安装指定版本的python包

    pip install -v package_name==2.3

  6. Effect

    /////////////////////////////////shader source/////////////////////////////////Texture2D colorMap : ...

  7. SQL Server数据库定时备份解决方案

    SQL Server数据库定时备份解决方案 1.本方案采用软件为:SQLBackupAndFTP 10.0.3 版本,压缩包自带注册机,请自行破解. 2.软件截图如下: 3.功能说明:自动定时备份相关 ...

  8. 时间模块 --- time

    表示时间有三种方法:timestamps  Format String    struct-time 1 时间戳 :通常来说,时间戳表示的是从1970年一月一日00:00:00开始按秒计算的偏移量,使 ...

  9. corejava-内容梳理

  10. 文件查找find命令

    find命令总结: 常用选项: -name 查找/etc目录下以conf结尾的文件 find /etc -name '*conf' -iname 查找当前目录下文件名为aa的文件,不区分大小写 fin ...