Problem with "make regen-pegen"

Bug report

Bug description:

Hey there! I have some problem with command make regen-pegen after editing Grammar > python.gram file.

CPython was correctly compiled and lauched.

If i type this after editing grammar file:
make regen-pegen

I got this:

PYTHONPATH=./Tools/peg_generator python3 -m pegen -q c \
        ./Grammar/python.gram \
        ./Grammar/Tokens \
        -o ./Parser/pegen/parse.new.c
Traceback (most recent call last):
  File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/webmilk/Desktop/cpython-3.9/Tools/peg_generator/pegen/__main__.py", line 16, in <module>
    from pegen.build import Grammar, Parser, Tokenizer, ParserGenerator
  File "/home/webmilk/Desktop/cpython-3.9/Tools/peg_generator/pegen/build.py", line 11, in <module>
    from pegen.c_generator import CParserGenerator
  File "/home/webmilk/Desktop/cpython-3.9/Tools/peg_generator/pegen/c_generator.py", line 2, in <module>
    from dataclasses import field, dataclass
ModuleNotFoundError: No module named 'dataclasses'
Makefile:871: recipe for target 'regen-pegen' failed
make: *** [regen-pegen] Error 1

Ubuntu: 18.04
CPython: 3.9

CPython versions tested on:

3.9

Operating systems tested on:

Linux

[skirpichev]

3.9 branch now only for security fixes. Can you reproduce that on 3.12+?

[ronaldoussoren]

For the issue at hand: @0xWEBMILK: Make sure that the python3 command on your shell's search path is recent enough. You are currently using Python 3.6 to run the parser generator and that won't work.

[picnixz]

The issue is:

File "/home/webmilk/Desktop/cpython-3.9/Tools/peg_generator/pegen/c_generator.py", line 2, in
from dataclasses import field, dataclass

Since dataclasses were introduced in 3.7, this is the reason why the build fails. I will close this one as not an issue (feel free to say otherwise if the issue persists even when upgrading to Python 3.10 (which I think is the minimal version for the parser))