As a short-term workaround, you have two options:
(1) Create a symlink python in your $PATH that references python3. This can be done in one of several ways:

Some Linux distros have a python-is-python3 package for that
Some distros have other "official" ways to do it
Or you can just sudo ln -s /usr/local/bin/python3 /usr/local/bin/python (or whatever the correct paths are on your system).

(2) You can call gm.py with an explicit Python binary:
python3 tools/dev/gm.py
Medium-term, gm.py should be updated to require python3 directly. The fact that it doesn't do so yet is an artifact of the Python2-to-Python3 migration.
macos monterey 12.3.1
python -V: python3
which python3: /usr/local/bin/python3
alias python="/usr/bin/python3"
path: /Users/Bill/Public/browser/depot_tools /usr/local/bin /usr/bin /bin /usr/sbin /sbin
proxy: proxychains4 + tor socks5 127.0.0.1 9150
cloned dedepot_tools in git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
run gclient working good
run: fetch v8
run: gclient sync working good
run: tools/dev/gm.py x64.release
show:
env: python: No such file or directory
how to fix it?
should install python-is-python3?
brew info python-is-python3
Error: No available formula with the name "python-is-python3". Did you mean python-tk@3.9?
gm.py x64.release Errorr---env: python: No such file or directory