这里是python的新手。使用来自CRUD-PythonFlask站点的PyCharm 社区版处理基本项目。在执行迁移步骤时，在命令后出现如下错误flask db init：
Traceback (most recent call last):
File "C:\Python27\Lib\runpy.py", line 174, in_run_module_as_main
"__main__", fname, loader, pkg_name)
File "C:\Python27\Lib\runpy.py", line 72, in _run_code
exec code in run_globals
File "C:\Users\elkkanah\PycharmProjects\aquauk\venv\Scripts\flask.exe\__main__.py", line 9, in <m
odule>
File "c:\users\elkkanah\pycharmprojects\aquauk\venv\lib\site-packages\flask\cli.py", line 894, in
main
cli.main(args=args, prog_name=name)
File "c:\users\elkkanah\pycharmprojects\aquauk\venv\lib\site-packages\flask\cli.py", line 557, in
main
return super(FlaskGroup, self).main(*args, **kwargs)
File "c:\users\elkkanah\pycharmprojects\aquauk\venv\lib\site-packages\click\core.py", line 717, i
n main
rv = self.invoke(ctx)
File "c:\users\elkkanah\pycharmprojects\aquauk\venv\lib\site-packages\click\core.py", line 1137,
in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "c:\users\elkkanah\pycharmprojects\aquauk\venv\lib\site-packages\click\core.py", line 1137,
in …