[Python] pipreqs fails with SyntaxError when scanning Python 2 code in a Python 3 environment

I have a python3 virtual environment but there are some python2 syntaxed files. I am trying to get the requirement.txt using pip freeze and pipreqs, but neither worked.

The error message looks like follow:

INFO: Not scanning for jupyter notebooks.
ERROR: Failed on file: ./tests/data/python2.py
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "/Users/plus1/Desktop/black/venv/lib/python3.12/site-packages/pipreqs/pipreqs.py", line 615, in <module>
main() # pragma: no cover
^^^^^^
File "/Users/plus1/Desktop/black/venv/lib/python3.12/site-packages/pipreqs/pipreqs.py", line 609, in main
init(args)
File "/Users/plus1/Desktop/black/venv/lib/python3.12/site-packages/pipreqs/pipreqs.py", line 533, in init
candidates = get_all_imports(
^^^^^^^^^^^^^^^^
File "/Users/plus1/Desktop/black/venv/lib/python3.12/site-packages/pipreqs/pipreqs.py", line 153, in get_all_imports
raise exc
File "/Users/plus1/Desktop/black/venv/lib/python3.12/site-packages/pipreqs/pipreqs.py", line 139, in get_all_imports
tree = ast.parse(contents)
^^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/Cellar/python@3.12/3.12.2_1/Frameworks/Python.framework/Versions/3.12/lib/python3.12/ast.py", line 52, in parse
return compile(source, filename, mode, flags,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "<unknown>", line 7
print >> sys.stderr , "Look, a repr:", `sys`
^
SyntaxError: invalid syntax


And the erroring file looks like below：

#!/usr/bin/env python2

import sys

print >> sys.stderr , "Warning:" ,
print >> sys.stderr , "this is a blast from the past."
print >> sys.stderr , "Look, a repr:", `sys`


def function((_globals, _locals)):
exec ur"print 'hi from exec!'" in _globals, _locals

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