python-如何在 Flask 中设置全局变量？
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python-How to set global variables in Flask?
提问by jinglei
I'm working on a Flaskproject and I want to have my index load more contents when scroll.
I want to set a global variable to save how many times have the page loaded.
My project is structured as :
我正在做一个Flask项目，我想让我的索引在滚动时加载更多内容。我想设置一个全局变量来保存页面加载的次数。我的项目结构如下：
├──run.py
└──app
├──templates
├──_init_.py
├──views.py
└──models.py
At first, I declare the global variable in _init_.py:
首先，我声明了全局变量_init_.py：
global index_add_counter
and Pycharm warned Global variable 'index_add_counter' is undefined at the module level
和 Pycharm 警告 Global variable 'index_add_counter' is undefined at the module level
In views.py:
在views.py：
from app import app,db,index_add_counter
and there's ImportError: cannot import name index_add_counter
还有 ImportError: cannot import name index_add_counter
I've also referenced global-variable-and-python-flaskBut I don't have a main() function. What is the right way to set global variable in Flask?
我还引用了global-variable-and-python-flask但我没有 main() 函数。在 Flask 中设置全局变量的正确方法是什么？
采纳答案by Salva
With:
和：
global index_add_counter
You are not defining, just declaring so it's like saying there is a global index_add_countervariable elsewhere, and notcreate a global called index_add_counter. As you name don't exists, Python is telling you it can not import that name. So you need to simply remove the globalkeyword and initialize your variable:
您不是在定义，只是在声明，所以这就像在说别处有一个全局index_add_counter变量，而不是创建一个名为index_add_counter. 由于您的名字不存在，Python 告诉您它无法导入该名称。因此，您只需删除global关键字并初始化您的变量：
index_add_counter = 0
Now you can import it with:
现在您可以使用以下命令导入它：
from app import index_add_counter
The construction:
那个工程：
global index_add_counter
is used inside modules' definitions to force the interpreter to look for that name in the modules' scope, not in the definition one:
在模块的定义中使用以强制解释器在模块的范围内查找该名称，而不是在定义一中：
index_add_counter = 0
def test():
global index_add_counter # means: in this scope, use the global name
print(index_add_counter)
