Kivy项目导入kivy.garden.knob报KeyError错误求助

Hey there, that KeyError you're hitting means Kivy can't locate the knob garden component—this is almost always an issue with how the garden package was installed. Let's walk through the fixes step by step:

Step 1: Ensure the Kivy Garden tool is installed #

First, confirm you have the kivy-garden package set up, since it's required to manage all garden components. Run this command in your terminal:

pip install kivy-garden

Since your log shows you're using Python 3, use pip3 instead to avoid mixing environments if you have both Python 2 and 3 installed:

pip3 install kivy-garden

Step 2: Install the Knob component properly #

Once the garden tool is ready, install the knob component with:

garden install knob

For Python 3 specifically, you might need to use garden3 to target the correct environment:

garden3 install knob

Wait for the installation to finish—if you see any errors here, note them down (they'll help diagnose further issues).

Step 3: Verify the installation path #

Kivy garden components are stored in your user's .kivy/garden directory. Check if the knob folder exists at this path:

/Users/nolandonley/.kivy/garden/knob

If it's missing, the installation failed. Re-run the garden install knob command and watch for any error messages during the process.

Step 4: Force Python to recognize the garden path (temporary workaround) #

If the component is installed but still not found, you can explicitly add the garden directory to Python's path at the start of your script:

import sys
from kivy.garden import garden

# Add the garden directory to Python's path
sys.path.append(garden.garden_dir)

# Now import the Knob
from kivy.garden.knob import Knob

This is a quick fix, but it's better to resolve the root installation issue if possible.

Step 5: Clean reinstall if all else fails #

If none of the above works, try a fresh reinstall of the garden tool and knob component:

# Uninstall existing packages
pip3 uninstall kivy-garden
garden3 uninstall knob

# Reinstall from scratch
pip3 install kivy-garden
garden3 install knob

Your Error Log Reference #

For context, here's the error you shared:

Nolans-MacBook-Pro:~ nolandonley$ kivy /Users/nolandonley/Desktop/Kivy/main1.py
Purge log fired. Analysing...
Purge finished!
[INFO ] [Logger      ] Record log in /Applications/Kivy.app/Contents/Resources/.kivy/logs/kivy_18-05-28_32.txt
[INFO ] [Kivy        ] v1.10.0
[INFO ] [Python      ] v3.5.0 (default, Jun 11 2017, 01:10:38) 
[GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.30.5)]
[INFO ] [Factory     ] 194 symbols loaded
[INFO ] [Image       ] Providers: img_tex, img_imageio, img_dds, img_sdl2, img_gif (img_pil, img_ffpyplayer ignored)
[INFO ] [Text        ] Provider: sdl2
[INFO ] [OSC         ] using <multiprocessing> for socket
[INFO ] [Window      ] Provider: sdl2
[INFO ] [GL          ] Using the "OpenGL ES 2" graphics system
[INFO ] [GL          ] Backend used <gl>
[INFO ] [GL          ] OpenGL version <b'2.1 INTEL-10.32.48'>
[INFO ] [GL          ] OpenGL vendor <b'Intel Inc.'>
[INFO ] [GL          ] OpenGL renderer <b'Intel Iris Pro OpenGL Engine'>
[INFO ] [GL          ] OpenGL parsed version: 2, 1
[INFO ] [GL          ] Shading version <b'1.20'>
[INFO ] [GL          ] Texture max size <16384>
[INFO ] [GL          ] Texture max units <16>
[INFO ] [Window      ] auto add sdl2 input provider
[INFO ] [Window      ] virtual keyboard not allowed, single mode, not docked
Traceback (most recent call last):
  File "/Users/nolandonley/Desktop/Kivy/main1.py", line 17, in <module>
    from kivy.garden.knob import Knob
File "<frozen importlib._bootstrap>", line 969, in _find_and_load
File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 664, in _load_unlocked
File "<frozen importlib._bootstrap>", line 636, in _load_backward_compatible
KeyError: 'kivy.garden.knob'

内容的提问来源于stack exchange，提问作者nolan