依赖项问题 - ImportError：无法导入名称 getfullargspec

Question

我试图在 python 中使用 mayavi 来可视化点云，但无法解决此错误。我确信这是一个简单的 pip 安装，但我不确定该命令。任何帮助深表感谢！谢谢！

顺便说一句，我正在运行 Ubuntu 18.04 并尝试安装 scipy，如下所述：Python import error "getfullargspec"。我还运行了 pip install Traitsui。此外，我已经重新启动了系统。

更新：经过进一步挖掘，看来这可能是Python版本的问题。我能够让它与 Python3 一起运行，但不能与 Python 2.7 一起运行（我需要它与 python 2 一起工作）。我还尝试将 handler.py 中的代码修改为getargspec而不是getfullargspec. 通过这样做，我收到了有关 Trait_factory 的错误

这是完整的打印输出：

 Traceback (most recent call last):
  File "mayavi_test.py", line 3, in <module>
    from mayavi import mlab
  File "/home/user/.local/lib/python2.7/site-packages/mayavi/mlab.py", line 16, in <module>
    from mayavi.tools.camera import view, roll, yaw, pitch, move
  File "/home/user/.local/lib/python2.7/site-packages/mayavi/tools/camera.py", line 24, in <module>
    from .engine_manager import get_engine
  File "/home/user/.local/lib/python2.7/site-packages/mayavi/tools/engine_manager.py", line 12, in <module>
    from mayavi.preferences.api import preference_manager
  File "/home/user/.local/lib/python2.7/site-packages/mayavi/preferences/api.py", line 4, in <module>
    from .preference_manager import preference_manager
  File "/home/user/.local/lib/python2.7/site-packages/mayavi/preferences/preference_manager.py", line 29, in <module>
    from traitsui.api import View, Group, Item
  File "/home/user/.local/lib/python2.7/site-packages/traitsui/api.py", line 37, in <module>
    from .editors.api import (
  File "/home/user/.local/lib/python2.7/site-packages/traitsui/editors/__init__.py", line 26, in <module>
    from .api import (
  File "/home/user/.local/lib/python2.7/site-packages/traitsui/editors/api.py", line 6, in <module>
    from .array_editor import ArrayEditor
  File "/home/user/.local/lib/python2.7/site-packages/traitsui/editors/array_editor.py", line 34, in <module>
    from ..view import View
  File "/home/user/.local/lib/python2.7/site-packages/traitsui/view.py", line 41, in <module>
    from .ui import UI
  File "/home/user/.local/lib/python2.7/site-packages/traitsui/ui.py", line 51, in <module>
    from .handler import Handler, ViewHandler
  File "/home/user/.local/lib/python2.7/site-packages/traitsui/handler.py", line 27, in <module>
    from inspect import getfullargspec
ImportError: cannot import name getfullargspec

Answer 1

这个问题的解决方案是使用旧的包。并非所有依赖项（例如 Traitsui）都与 Python 2.7 兼容。即使安装了旧版本的 mayavi，自动安装的依赖项也不兼容（它们仅支持 Python 3）。

以下是适合我的版本：

玛雅维==4.6.2

特征==6.1.3

特质==5.2.0

numpy==1.17.4

pyface==6.1.2

要安装特定版本，只需运行sudo pip install packageName==#.#.#