docs: def get_modpath(modname, prefer_pkg=False, prefer_main=False):
      r"""
      Returns path to module
  
      Args:
          modname (str or module): module name or actual module
  
      Returns:
          str: module_dir
  
      CommandLine:
          python -m utool.util_path --test-get_modpath
  
      Setup:
          >>> from utool.util_path import *  # NOQA
          >>> import utool as ut
          >>> utool_dir = dirname(dirname(ut.__file__))
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_path import *  # NOQA
          >>> import utool as ut
          >>> utool_dir = dirname(dirname(ut.__file__))
          >>> modname = 'utool.util_path'
          >>> module_dir = get_modpath(modname)
          >>> result = ut.truepath_relative(module_dir, utool_dir)
          >>> result = ut.ensure_unixslash(result)
          >>> print(result)
          utool/util_path.py
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_path import *  # NOQA
          >>> import utool as ut
          >>> utool_dir = dirname(dirname(ut.__file__))
          >>> modname = 'utool._internal'
          >>> module_dir = get_modpath(modname, prefer_pkg=True)
          >>> result = ut.ensure_unixslash(module_dir)
          >>> print(result)
          >>> assert result.endswith('utool/_internal')
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_path import *  # NOQA
          >>> import utool as ut
          >>> utool_dir = dirname(dirname(ut.__file__))
          >>> modname = 'utool'
          >>> module_dir = get_modpath(modname)
          >>> result = ut.truepath_relative(module_dir, utool_dir)
          >>> result = ut.ensure_unixslash(result)
          >>> print(result)
          utool/__init__.py
      """
      import importlib
      if isinstance(modname, six.string_types):
          module = importlib.import_module(modname)
      else:
          module = modname  # Hack
      modpath = module.__file__.replace('.pyc', '.py')
      initname = '__init__.py'
      mainname = '__main__.py'
      if prefer_pkg:
          if modpath.endswith(initname) or modpath.endswith(mainname):
              modpath = dirname(modpath)
              # modpath = modpath[:-len(initname)]
      if prefer_main:
          if modpath.endswith(initname):
              main_modpath = modpath[:-len(initname)] + mainname
              if exists(main_modpath):
                  modpath = main_modpath
      #modname = modname.replace('.__init__', '').strip()
      #module_dir = get_module_dir(module)
      return modpath