I have been running pyenv from homebrew on Mac so I could run Python3 rather than 2.7. However when I upgraded to Catalina I ran into an issue that pyenv wasn’t working anymore. When I went through the GitHub page for pyenv at: pyenv and followed all of the steps and got to this part:

• Add pyenv init to your shell to enable shims and autocompletion. Please make sure eval "$(pyenv init -)" is placed toward the end of the shell configuration file since it manipulates PATH during the initialization.$ echo -e ‘if command -v pyenv 1>/dev/null 2>&1; then\n eval “$(pyenv init -)”\nfi’ >> ~/.bash_profile
  • Zsh note: Modify your ~/.zshenv file instead of ~/.bash_profile.
  • fish note: Use pyenv init - | source instead of eval (pyenv init -).
  • Ubuntu and Fedora note: Modify your ~/.bashrc file instead of ~/.bash_profile.General warning: There are some systems where the BASH_ENV variable is configured to point to .bashrc. On such systems you should almost certainly put the abovementioned line eval "$(pyenv init -)" into .bash_profile, and not into .bashrc. Otherwise you may observe strange behaviour, such as pyenv getting into an infinite loop. See #264 for details.

.zshenv should actually be .zshrc