为何出现ImportError: No module named visual.graph错误？已装VPython仍报错

Hey there, let's break down and fix your VPython issues one by one:

1. The Root Import Issue: VPython's Module Name Changed #

First off, the old visual module is deprecated in newer VPython versions—they've switched to using vpython as the main package name. That's why your from visual.graph import * line is throwing an error, even if you thought you installed VPython correctly.

Fix your code import first:
Replace:

from visual.graph import *

With:

from vpython.graph import *

2. Resolving the Conda UnsatisfiableError (Astropy + VPython Conflict) #

The conflict between astropy and vpython in your base environment is a common conda dependency issue. Here are two reliable fixes:

Option 1: Create a Fresh Conda Environment (Recommended) #

Isolating VPython in its own environment avoids messing with your base setup's existing packages:

1. Create a new environment (name it whatever you like, e.g., vpython-env):

   conda create -n vpython-env python=3.9
   

2. Activate the environment:

   conda activate vpython-env
   

3. Install VPython in this clean environment:

   conda install -c mwcraig vpython
   

Option 2: Install VPython via Pip #

If you want to stick with your base environment, pip is less strict about dependency conflicts than conda:

pip install vpython

3. Verify the Fix #

After installing correctly, test with a simple graph snippet to make sure everything works:

from vpython.graph import *

# Create a simple plot
graph(title='Test Graph', xtitle='X', ytitle='Y')
f1 = gcurve(color=color.blue)
for x in range(10):
    f1.plot(x, x**2)

If this runs without errors, you're all set!

内容的提问来源于stack exchange，提问作者Vitor Bento