树莓派4 Linux系统下VS Code安装pywhatkit模块卡顿问题

Hey there, I’ve dealt with this exact problem on my Raspberry Pi 4 before—compiling OpenCV from source via pip is super resource-heavy and slow on the Pi, which is why your installation is getting stuck. Let’s walk through the most effective fixes:

1. Use Pre-compiled OpenCV from Raspberry Pi’s Official Repository #

The easiest way to avoid compiling from source is to install OpenCV via the system package manager first, then install pywhatkit. This skips the slow compilation step entirely:

# Update package lists
sudo apt-get update
# Install pre-compiled OpenCV for Python 3
sudo apt-get install python3-opencv
# Now install pywhatkit (it will use the system's OpenCV instead of compiling)
pip3 install pywhatkit

2. Increase Swap Space (If Memory is the Bottleneck) #

Raspberry Pi 4’s default swap size is small, and compiling OpenCV needs a lot of memory. Temporarily increasing swap can prevent the process from hanging:

• Stop the swap service:

  sudo dphys-swapfile stop
  

• Edit the swap configuration file:

  sudo nano /etc/dphys-swapfile
  

• Find the line CONF_SWAPSIZE=100 and change it to CONF_SWAPSIZE=2048 (2GB swap).
• Save and exit (Ctrl+O, then Ctrl+X), then restart the swap service:

  sudo dphys-swapfile start
  

• Now try installing pywhatkit again. Once done, you can revert the swap size to avoid wearing out your SD card.

3. Specify a Compatible Older Version of opencv-python #

Newer versions of opencv-python can be trickier to compile on the Pi. Try installing a slightly older version that’s more Pi-friendly:

pip3 install pywhatkit opencv-python==4.2.0.32

4. Use a Domestic PyPI Mirror for Faster Downloads #

Sometimes the process appears stuck because it’s downloading source files slowly. Use a mirror to speed things up:

pip3 install pywhatkit -i https://pypi.tuna.tsinghua.edu.cn/simple

Why This Happens #

When you install pywhatkit, it pulls in opencv-python as a dependency. If there’s no pre-compiled wheel available for your Raspberry Pi’s architecture, pip will try to compile OpenCV from scratch. Compiling OpenCV is a lengthy process that eats up CPU and memory—on a Pi 4, this can take hours (or appear to hang entirely). Using pre-compiled packages skips this painstaking step.

内容的提问来源于stack exchange，提问作者Kuldip Gami