依赖项导入问题错误：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。我相信这是一个简单的pip安装，但我不确定的命令。非常感谢您的帮助！谢谢

顺便说一句，我正在运行Ubuntu18.04，并已尝试安装scipy，如下所述：Python import error "getfullargspec"。我还运行了pip安装traitsui。此外，我已经重新启动了我的系统

更新： 在进一步挖掘之后，似乎这可能是Python版本的问题。我能够让它与Python3一起运行，但不是Python2.7（我需要它与Python2一起工作）。我还尝试将handler.py中的代码修改为getargspec，而不是getfullargspec。我这样做是因为我犯了一个关于工厂的错误

以下是完整的打印输出：

 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软件包。并非所有依赖项（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（它们只支持Python 3）

以下是适合我的版本：

mayavi==4.6.2

traitsui==6.1.3

traits==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==#.#.#