globals | 易学教程

python locals和globals

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locals和globals 标记一下：Dive Into Python 内容我们先偏离一下 HTML 处理的主题, 讨论一下 Python 如何处理变量。 Python 有两个内置的函数,locals和globals, 它们提供了基于 dictionary 的访问局部和全局变量的方式。还记得locals吗? 您第一次是在这里看到的: def unknown_starttag (self, tag, attrs): strattrs = "" .join([ ' %s="%s"' % (key, value) for key, value in attrs]) self.pieces.append( "<%(tag)s%(strattrs)s>" % locals()) 不, 等等, 此时您还不能理解locals。首先, 您需要学习关于命名空间的知识。这很枯燥, 但是很重要, 因此要要耐心些。 Python 使用叫做名字空间的东西来记录变量的轨迹。名字空间只是一个 dictionary ，它的键字就是变量名，它的值就是那些变量的值。实际上，名字空间可以象 Python 的 dictionary 一样进行访问，一会我们就会看到。在一个 Python 程序中的任何一个地方，都存在几个可用的名字空间。每个函数都有着自已的名字空间，叫做局部名字空间，它记录了函数的变量

Where are constant variables stored in C?

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问题 I wonder where constant variables are stored. Is it in the same memory area as global variables? Or is it on the stack? 回答1: How they are stored is an implementation detail (depends on the compiler). For example, in the GCC compiler, on most machines, read-only variables, constants, and jump tables are placed in the text section. 回答2: Depending on the data segmentation that a particular processor follows, we have five segments: Code Segment - Stores only code, ROM BSS (or Block Started by

Using global variables between files?

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问题 I\'m bit confused about how the global variables work. I have a large project, with around 50 files, and I need to define global variables for all those files. What I did was define them in my projects main.py file, as following: # ../myproject/main.py # Define global myList global myList myList = [] # Imports import subfile # Do something subfile.stuff() print(myList[0]) I\'m trying to use myList in subfile.py , as following # ../myproject/subfile.py # Save \"hey\" into myList def stuff():