[英]Global variables in Python to share variable across files
I have a Python script that gets a command line argument, and then it is stored as a global variable within the script: 我有一个获取命令行参数的Python脚本,然后将其存储为脚本中的全局变量:
global chain
chain = sys.argv[1]
The script then imports a couple of other files, each containing another function. 然后,脚本将导入几个其他文件,每个文件包含另一个功能。 I am trying to carry the value of this variable to the other functions as well, by doing the following:
我正在尝试通过执行以下操作将此变量的值也传递给其他函数:
def func():
global chain
#do stuff
which is contained in another file than the original script. 它包含在不同于原始脚本的另一个文件中。
When I run the script, I get 当我运行脚本时,我得到
NameError: global name 'chain' is not defined
What am I missing? 我想念什么?
global
in Python means "within that module". Python中的
global
表示“在该模块内”。 It does not share names across modules. 它不跨模块共享名称。
If you want to access a variable defined in one module from another, simply import it: 如果要从另一个模块访问一个模块中定义的变量,只需将其导入:
from my_module import chain
or, even better, pass it as an argument to func
. 甚至更好的是,将其作为
func
的参数传递。
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