Retrieves a module name from a path

getmodulenamefrompath.py

import inspect
import os


def get_module_name_from_path(path):
    if not os.path.exists(path):
        raise ValueError("The path '%s' is not a valid path." % path)
    
    path = os.path.abspath(path)
    full_names = []
    for sys_path in sys.path:
        if path.startswith(sys_path):
            relative_path = path[len(sys_path):].lstrip(os.sep)
            if not relative_path:
                continue
            
            full_name_parts = relative_path.split(os.sep)
            module_name = inspect.getmodulename(path)
            if module_name:
                if module_name == '__init__':
                    del full_name_parts[-1]
                else:
                    full_name_parts[-1] = module_name
            elif os.path.isfile(path):
                raise ValueError("The path '%s' is not a valid module." % path)
            
            if full_name_parts:
                full_names.append('.'.join(full_name_parts))
    
    full_names.sort(key=lambda full_name: -len(full_name))
    for full_name in full_names:
        if full_name in sys.modules:
            return full_name
    
    return full_names[0] if full_names else None