human
Solve the following python programming problem given the following code:
@ classmethod 
def get_user_workspace(cls, user) : 
    '
        Get the file workspace (directory) for a user.

        Args:
          user(User or HttpRequest): User or request object.

        Returns:
          tethys_apps.base.TethysWorkspace: An object representing the workspace.

        **Example:**

        ::

            import os
            from .app import MyFirstApp

            def a_controller(request):
                """
                Example controller that uses get_user_workspace() method.
                """
                # Retrieve the workspace
                user_workspace = MyFirstApp.get_user_workspace(request.user)
                new_file_path = os.path.join(user_workspace.path, \'new_file.txt\')

                with open(new_file_path, \'w\') as a_file:
                    a_file.write(\'...\')

                context = {}

                return render(request, \'my_first_app/template.html\', context)

        ' 
    username = '' 
    from django.contrib.auth.models import User 
    if (isinstance (user, User) or isinstance (user, SimpleLazyObject)) : 
        username = user.username 
else : 
        if isinstance (user, HttpRequest) : 
            username = user.user.username 
else : 
            if (user is None) : 
                pass 
else : 
                raise ValueError ("Invalid type for argument 'user': must be either an User or HttpRequest object.") 
if (not username) : 
        username = 'anonymous_user' 
project_directory = os.path.dirname (sys.modules [cls.__module__].__file__) 
    workspace_directory = os.path.join (project_directory, 'workspaces', 'user_workspaces', username) 
    return TethysWorkspace (user) 

    
    

    Fix the buggy line: return TethysWorkspace (user)
assistant
#Here is Python code to fix the buggy line: return TethysWorkspace (user)
.

return TethysWorkspace (workspace_directory)