Python3.6+R3.4环境下rpy2导入报错：Lookup Error: 'show' not found

I’ve run into this exact compatibility issue before with older Python/R and rpy2 combinations—here’s how to resolve it step by step:

• Pin rpy2 to a compatible version
  Newer rpy2 releases drop support for Python 3.6 and R 3.4. You need to install a version that explicitly supports this stack. Run these commands in your terminal:

  pip uninstall -y rpy2
  pip install rpy2==2.9.6
  

  Version 2.9.6 is the last stable release that works reliably with Python 3.6 and R 3.4.

• Set the R_HOME environment variable
  Sometimes rpy2 can’t automatically locate your R installation. On macOS, set the path to your R 3.4 resources folder:

  export R_HOME=/Library/Frameworks/R.framework/Versions/3.4/Resources
  

  To make this permanent, add the line above to your ~/.bash_profile or ~/.zshrc file (depending on your shell) and restart your terminal.

• Verify R’s core functions are intact
  The "show" error can also happen if R’s base packages are corrupted. Open an R terminal and run:

  show
  

  You should see output like function (object) .Primitive("show"). If not, repair your R installation by reinstalling R 3.4 or running install.packages("base", repos="https://cran.r-project.org") in R.

• Test the import again
  After completing the steps above, launch Python and try importing again:

  import rpy2.robjects as robjects
  

  The warnings might still appear (they’re often just deprecation notices for older packages), but the "show" lookup error should be gone.

内容的提问来源于stack exchange，提问作者Jessica