На вход python3.req.py даем:
```
[user@host dir]$ cat foo.py
uiModule = __import__('pywikibot.userinterfaces.%s_interface'
                      % config.userinterface,
                      fromlist=['UI'])
module = __import__('%s' % module_name)
```
На выходе получаем:
python3(%s)
python3(pywikibot.userinterfaces.%s_interface)

Немного диагностики:
```
(Pdb) bt
  /usr/lib/rpm/python3.req.py(249)<module>()
-> dependencies, relative_dependencies = read_ast_tree(code, file_name, REQ)
> /usr/lib/rpm/python3.req.py(68)read_ast_tree()
-> relative_dep.add(chuck_norris.args[0].left.value)
(Pdb) type(chuck_norris.args[0])
<class 'ast.BinOp'>
(Pdb) type(chuck_norris.args[0].left.value) != ast.Attribute
True
(Pdb) type(chuck_norris.args[0].left.value)
<class 'str'>
```