由于 Dash，无法运行 Django 本地服务器

Question

我在安装 django_plotly_dash 后尝试迁移我的 Django 数据库，但我收到此错误，即使我已经安装了 dash 并且工作正常。当我用 Django 尝试时，为什么这不起作用？

命令：

C:\Users\xxx\Python\Price Tracking\Django\mysite>python manage.py migrate
Installing dash:
C:\Users\xxx>pip install --trusted-host=pypi.org --trusted-host=files.pythonhosted.org dash
Requirement already satisfied: dash in c:\python38\lib\site-packages (1.12.0)
Requirement already satisfied: Flask>=1.0.2 in c:\python38\lib\site-packages (from dash) (1.1.2)
Requirement already satisfied: flask-compress in c:\python38\lib\site-packages (from dash) (1.5.0)
Requirement already satisfied: plotly in c:\python38\lib\site-packages (from dash) (4.7.1)
Requirement already satisfied: dash_renderer==1.4.1 in c:\python38\lib\site-packages (from dash) (1.4.1)
Requirement already satisfied: dash-core-components==1.10.0 in c:\python38\lib\site-packages (from dash) (1.10.0)
Requirement already satisfied: dash-html-components==1.0.3 in c:\python38\lib\site-packages (from dash) (1.0.3)
Requirement already satisfied: dash-table==4.7.0 in c:\python38\lib\site-packages (from dash) (4.7.0)
Requirement already satisfied: future in c:\python38\lib\site-packages (from dash) (0.18.2)
Requirement already satisfied: itsdangerous>=0.24 in c:\python38\lib\site-packages (from Flask>=1.0.2->dash) (1.1.0)
Requirement already satisfied: Werkzeug>=0.15 in c:\python38\lib\site-packages (from Flask>=1.0.2->dash) (1.0.1)
Requirement already satisfied: Jinja2>=2.10.1 in c:\python38\lib\site-packages (from Flask>=1.0.2->dash) (2.11.2)
Requirement already satisfied: click>=5.1 in c:\python38\lib\site-packages (from Flask>=1.0.2->dash) (7.1.2)
Requirement already satisfied: MarkupSafe>=0.23 in c:\python38\lib\site-packages (from Jinja2>=2.10.1->Flask>=1.0.2->dash) (1.1.1)
Requirement already satisfied: brotli in c:\python38\lib\site-packages (from flask-compress->dash) (1.0.7)
Requirement already satisfied: six in c:\python38\lib\site-packages (from plotly->dash) (1.14.0)
Requirement already satisfied: retrying>=1.3.3 in c:\python38\lib\site-packages (from plotly->dash) (1.3.3)

错误：

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    main()
  File "manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "C:\Python38\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "C:\Python38\lib\site-packages\django\core\management\__init__.py", line 377, in execute
    django.setup()
  File "C:\Python38\lib\site-packages\django\__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "C:\Python38\lib\site-packages\django\apps\registry.py", line 91, in populate
    app_config = AppConfig.create(entry)
  File "C:\Python38\lib\site-packages\django\apps\config.py", line 116, in create
    mod = import_module(mod_path)
  File "C:\Python38\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:\Python38\lib\site-packages\django_plotly_dash\__init__.py", line 31, in <module>
    from .dash_wrapper import DjangoDash
  File "C:\Python38\lib\site-packages\django_plotly_dash\dash_wrapper.py", line 32, in <module>
    from dash import Dash
ImportError: cannot import name 'Dash' from 'dash' (C:\Users\xxxx\AppData\Roaming\Python\Python38\site-packages\dash\__init__.py)```

Answer 1

Dash 的安装位置：

c:\python38\lib\site-packages

不是它寻找 Dash 的地方：

ImportError: cannot import name 'Dash' from 'dash' (C:\Users\xxxx\AppData\Roaming\Python\Python38\site-packages\dash\__init__.py)

这看起来像是 Python 路径名问题。如果您可以将它安装到它正在寻找的相同位置，或者将它正在寻找的位置更改为它正在安装的地方，它应该可以工作。

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