Doesn't work with Python3 plus broken/missing deps

[barseghyanartur]

OS: Fedora 31
Used Python version: 3.7

After fixing a couple of obvious Python2 to Python3 transition errors...

Such as this:

Traceback (most recent call last):
  File "/home/me/repos/myproj/venv/bin/sfood", line 5, in <module>
    from snakefood.gendeps import main
  File "/home/me/repos/myproj/venv/lib64/python3.7/site-packages/snakefood/gendeps.py", line 26, in <module>
    from snakefood.depends import output_depends, output_depends_inverted
  File "/home/me/repos/myproj/venv/lib64/python3.7/site-packages/snakefood/depends.py", line 53
    print json.dumps(output_dict)
             ^
SyntaxError: invalid syntax

And this:

Traceback (most recent call last):
  File "/home/me/repos/myproj/venv/bin/sfood", line 5, in <module>
    from snakefood.gendeps import main
  File "/home/me/repos/myproj/venv/lib64/python3.7/site-packages/snakefood/gendeps.py", line 27, in <module>
    from snakefood.find import find_dependencies
  File "/home/me/repos/myproj/venv/lib64/python3.7/site-packages/snakefood/find.py", line 267
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax

I bumped into this:

$ sfood .
Traceback (most recent call last):
  File "/home/me/repos/myproj/venv/bin/sfood", line 5, in <module>
    from snakefood.gendeps import main
  File "/home/me/repos/myproj/venv/lib64/python3.7/site-packages/snakefood/gendeps.py", line 27, in <module>
    from snakefood.find import find_dependencies
  File "/home/me/repos/myproj/venv/lib64/python3.7/site-packages/snakefood/find.py", line 9, in <module>
    import compiler
ModuleNotFoundError: No module named 'compiler'

Then I did pip install comiler (first guess) and re-ran the command:

$ sfood .
Traceback (most recent call last):
  File "/home/me/repos/myproj/venv/bin/sfood", line 5, in <module>
    from snakefood.gendeps import main
  File "/home/me/repos/myproj/venv/lib64/python3.7/site-packages/snakefood/gendeps.py", line 27, in <module>
    from snakefood.find import find_dependencies
  File "/home/me/repos/myproj/venv/lib64/python3.7/site-packages/snakefood/find.py", line 10, in <module>
    from compiler.visitor import ASTVisitor
ModuleNotFoundError: No module named 'compiler.visitor'