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我正在开发一个Django项目，该项目需要Ubuntu 16上的Python3.7.3虚拟环境。所以我创建了一个虚拟环境并在其中安装了所有需求并对其进行了验证，激活了它。

但是，当我尝试使用它运行Django服务器runserver时，会出现以下错误。

Traceback (most recent call last):
  File "/usr/lib/python3.7/decimal.py", line 3, in <module>
    from _decimal import *
ModuleNotFoundError: No module named '_decimal'

During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "./interfaces/control/manage.py", line 8, in <module>
        execute_from_command_line(sys.argv)
      File "/home/path/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
        utility.execute()
      File "/home/path/lib/python3.7/site-packages/django/core/management/__init__.py", line 375, in execute
        self.fetch_command(subcommand).run_from_argv(self.argv)
      File "/home/path/lib/python3.7/site-packages/django/core/management/__init__.py", line 224, in fetch_command
        klass = load_command_class(app_name, subcommand)
      File "/home/path/lib/python3.7/site-packages/django/core/management/__init__.py", line 36, in load_command_class
        module = import_module('%s.management.commands.%s' % (app_name, name))
      File "/home/path/lib/python3.7/importlib/__init__.py", line 127, in import_module
        return _bootstrap._gcd_import(name[level:], package, level)
      File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
      File "<frozen importlib._bootstrap>", line 983, in _find_and_load
      File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
      File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
      File "<frozen importlib._bootstrap_external>", line 728, in exec_module
      File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
      File "/home/path/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 10, in <module>
        from django.core.servers.basehttp import (
      File "/home/path/lib/python3.7/site-packages/django/core/servers/basehttp.py", line 17, in <module>
        from django.core.handlers.wsgi import LimitedStream
      File "/home/path/lib/python3.7/site-packages/django/core/handlers/wsgi.py", line 8, in <module>
        from django.core.handlers import base
      File "/home/path/lib/python3.7/site-packages/django/core/handlers/base.py", line 7, in <module>
        from django.urls import get_resolver, set_urlconf
      File "/home/path/lib/python3.7/site-packages/django/urls/__init__.py", line 1, in <module>
        from .base import (
      File "/home/path/lib/python3.7/site-packages/django/urls/base.py", line 4, in <module>
        from django.utils.encoding import iri_to_uri
      File "/home/path/lib/python3.7/site-packages/django/utils/encoding.py", line 4, in <module>
        from decimal import Decimal
      File "/usr/lib/python3.7/decimal.py", line 8, in <module>
        from _pydecimal import *
      File "/usr/lib/python3.7/_pydecimal.py", line 436, in <module>
        import contextvars
      File "/usr/lib/python3.7/contextvars.py", line 1, in <module>
        from _contextvars import Context, ContextVar, Token, copy_context
    ModuleNotFoundError: No module named '_contextvars'

请注意，它首先会转到我virtualenv这里的 Django 项目。

/home/path/lib/python3.7/site-packages/django/core/management/__init__.py

它再次在这里搜索 python 的全局位置。

/usr/lib/python3.7/_pydecimal.py

有人可以让我知道为什么它会转到全球位置并抛出错误。

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3 回答 3

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就我而言，虚拟环境中安装的 python 版本是 3.7.2，而我的计算机中唯一的版本是 3.7.3。所以，我重新安装了 3.7.2 版本，它工作正常。希望这对你有用 ！！！

于 2020-06-21T15:41:00.777 回答
1

问题在于 Global Python 解释器本身。

我按照https://linuxize.com/post/how-to-install-python-3-7-on-ubuntu-18-04/中的在 Ubuntu 上安装 Python 3.7 安装 Python 3.7。

不知何故，它没有为 python 解释器安装所有必需的包。

如果我在带有 Apt 的 Ubuntu 上使用安装 Python 3.7进行安装，一切正常。

于 2019-07-17T09:11:02.877 回答
0

对我来说，我检查了该位置，发现不知何故我的 requirements.txt 已将 Werkzeug 更改为 1.5x 版本。所以我恢复了这些更改，这解决了我的问题。

尝试这个。

pip3 install Werkzeug==2.0.1
于 2021-08-25T13:07:42.540 回答