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今天正常运行flask程序，但是系统报错，具体如下：

Traceback (most recent call last):
  File "s:\Program Files\JetBrains\PyCharm 2021.2\plugins\python\helpers\pydev\pydevd.py", line 1483, in _exec
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "s:\Program Files\JetBrains\PyCharm 2021.2\plugins\python\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
    exec(compile(contents+"\n", file, 'exec'), glob, loc)
  File "s:/Python/python-jiaoben/seo/main.py", line 33, in 
    app = Flask(__name__)
  File "s:\Python\Python39\lib\site-packages\flask\app.py", line 409, in __init__
    instance_path = self.auto_find_instance_path()
  File "s:\Python\Python39\lib\site-packages\flask\app.py", line 641, in auto_find_instance_path
    prefix, package_path = find_package(self.import_name)
  File "s:\Python\Python39\lib\site-packages\flask\scaffold.py", line 839, in find_package
    package_path = _find_package_path(root_mod_name)
  File "s:\Python\Python39\lib\site-packages\flask\scaffold.py", line 790, in _find_package_path
    return os.path.dirname(next(iter(spec.submodule_search_locations)))
TypeError: 'NoneType' object is not iterable

一脸懵逼，后来经过查找发现，是pycharm的问题，升级就可以搞定，但是升级又太麻烦，所以，采取下面的办法。

app = Flask(__name__, instance_path="/{project_folder_abs_path}/instance")

在入口中加入instance_path="/{project_folder_abs_path}/instance"参数即可。