Can't get a Python package installed

There are twelve executables named python on my intel macbook pro.  None of them are in my path, but "python3" in my path points to version 3.13.4 installed by homebrew. When I try python3 -m pip install pinyin I get two screens of diagnostics, starting with × This environment is externally managed ╰─> To install Python packages system-wide, try brew install xyz, where xyz is the package you are trying to install. but brew install pip says there is no formula for pip. I need to run a python script that starts with import sys import re import pinyin but it errs with a complaint about pinyin on line 3 I also tried doing it with the Apple-installed P{ython, but no success there either. Advice? Update: After studying those two screens of diagnostics, it seemed to advise me to install and use pipx instead.  So I did that, and then pipx install pinyin said pinyin is already installed!  So I tried running the intended command again and got the same complaint: WGroleau@MacBookPro pinyin % python3 convert_pinyin.py test.pinyin.php test.pinyin.php Traceback (most recent call last): File "/Users/WGroleau/ChiCal/pinyin/convert_pinyin.py", line 3, in import pinyin ModuleNotFoundError: No module named 'pinyin' WGroleau@MacBookPro pinyin %