Web2py:ImportError:尝试导入Web2py-modules目录中的模块时，没有名为patch的模块

Question

我在web2py的modules目录中有几个自定义模块。这些模块很容易导入控制器文件。但是，当我试图在scheduler.py文件中导入这些模块时，我收到了错误。请帮忙。

/home/www-data/web2py$ python web2py.py -K <app_name>
web2py Web Framework
Created by Massimo Di Pierro, Copyright 2007-2018
Version 2.15.4-stable+timestamp.2017.09.02.04.02.22
Database drivers available: sqlite3, imaplib, pymysql, pg8000
starting scheduler for "<app_name>"...
Currently running 1 scheduler processes
Traceback (most recent call last):
File "/home/www-data/web2py/gluon/restricted.py", line 219, in restricted
exec(ccode, environment)
File "applications/<app_name>/models/scheduler.py", line 28, in <module>
customSSH = local_import('customSSH')
File "/home/www-data/web2py/gluon/compileapp.py", line 444, in <lambda>
local_import_aux(name, reload, app)
File "/home/www-data/web2py/gluon/compileapp.py", line 347, in local_import_aux
module = __import__(name)
File "/home/www-data/web2py/gluon/custom_import.py", line 111, in custom_importer
return NATIVE_IMPORTER(name, globals, locals, fromlist, level)
File "applications/<app_name>/modules/customSSH.py", line 4, in <module>
import multiprocessing
File "/home/www-data/web2py/gluon/custom_import.py", line 111, in custom_importer
return NATIVE_IMPORTER(name, globals, locals, fromlist, level)
File "applications/<app_name>/modules/multiprocessing/__init__.py", line 64, in <module>
import multiprocessing.patch
File "/home/www-data/web2py/gluon/custom_import.py", line 111, in custom_importer
return NATIVE_IMPORTER(name, globals, locals, fromlist, level)
ImportError: No module named patch

Answer 1

问题是multiprocessing也是Python标准库中模块的名称。multiprocessing的初始导入由web2py自定义导入程序在/modules中找到。然而，当multiprocessing本身尝试导入multiprocessing.patch时，本机Python导入程序希望.patch是标准库multiprocessing的子模块，但这当然失败了。

如果multiprocessing是第三方库，那么最好将其安装在应用程序的/modules文件夹之外。如果是自定义模块或您可以轻松编辑的模块，则可以重命名模块或更改导入以引用完整的applications.<app_name>.modules路径，例如：

import applications.<app_name>.modules.multiprocessing.patch as patch