/usr/bin/less from zsh 5.0.2

Question

I wonder if this is only my case that when I use less 458 (POSIX regular expressions), ~/.zshenv is read.

Because I use pyenv and python is in a directory of pyenv (PATH is set in ~/.zshrc), less does not work. The error message is 'no python is available.'.

If I explicitly set, at the top of .zshenv, PATH=/usr/bin:$PATH, then less works.

Could you explain what is going on...