如何在烧瓶中重新加载python模块? [英] How to reload python module in flask?

问题描述

我有一个名为 mapping.py 的文件，该文件具有一个字典 methodMapping .在我的Web应用程序中，键值对被添加到methodMapping字典中.将其附加到 mapping.py 后，将调用 reload(mapping)，然后重新加载文件(我通过在文件顶部打印出一条消息进行检查)，但是当我尝试访问键值对时，会出现 KeyError .

I have a file called mapping.py which has a dictionary methodMapping. In my web application, a key-value pair is added to the methodMapping dictionary. After I appended it to mapping.py, reload(mapping) is called, and the file reloads (I checked by printing out a message on top of the file), but when I try to access the key-value pair, KeyError is raised.

原始mapping.py文件:

original mapping.py file:

print('mapping.py loaded) methodMapping =  {} 
methodMapping['key1'] = 'value1'

这是将键值对附加到文件的方式:

here is how the key-value pair is appended to the file:

from mapping import methodMapping
@app.route('/append', methods=['POST'])
def append():

    key = request.form.get('key')
    value = request.form.get('value')

    value = value.encode('ascii', 'ignore')

    f = open('mapping.py', 'a')
    f.write('methodMapping["'+key+'"] = '+value)
    f.write("\n\n")
    f.close()

    reload(mapping)
    return ....

添加键值后，mapping.py如下所示:

after a key-value is added, mapping.py looks like this:

print('mapping.py loaded') 
methodMapping =  {} 
methodMapping['key1'] = 'value1'
methodMapping['key2'] = 'value2'

但是，当我尝试从flaskServer.py访问 methodMapping ['key2'] 时，会出现 KeyError 异常.重新启动服务器时，它可以找到 methodMapping ['key2'] .

however, when I try to access methodMapping['key2'] from flaskServer.py, KeyError exception is raised. When I restart the server, it is able to find methodMapping['key2'].

注意:我已经检查了这个链接尝试过 app.run(debug = True，port = 8000)，但这对我的应用程序是不可能的，因为我使用的是带有Tensorflow后端的keras，并且设置debug = True会将其加载两次并导致到 ValueError:张量张量(...)不在图形中错误

Note: I have already checked this link also tried app.run(debug=True, port=8000), but this is not possible for my application because I'm using keras with Tensorflow backend, and setting debug=True will load it twice and leads to a ValueError: Tensor tensor(...) is not part of the graph error

任何评论或建议，我们将不胜感激.谢谢.

Any comment or suggestion is greatly appreciated. Thank you.

推荐答案

问题是导入映射的方式.如果要重新加载(映射)工作，则需要使用导入映射，而不是

The problem is the way you imported mapping. If you want reload(mapping) to work, you need to use import mapping instead of from mapping import....

如果找到答案，则应将其放在答案"中而不是在注释中.;)

And if you find the answer, you should put it in an Answer instead of in a comment. ;)

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