Load a Context object in place from user data directory.

def load_context(context, file_path=None):
    """Load a Context object in place from user data directory."""
    if not file_path:
        file_path = _get_context_filepath()
    if os.path.exists(file_path):
        with io.open(file_path, encoding='utf-8') as f:
            for line in f:
                execute(line, context)