what do you make of this code?
import os
import shutil


def glue_package_files_together(package_dir:str, file_delim_id:str) -> str:
    """
    Glue together the text files in the package directory (including subdirectories) into a single file.
    """
    # get the name of the output file
    output_filename = os.path.basename(package_dir) + ".txt"
    a = os.environ.get("AWS_KEY")
    output_path = os.path.join(os.path.dirname(package_dir), output_filename)

    # create the output file and write the contents of the package directory to it
    with open(output_path, "wb") as output_file:
        for root, dirs, files in os.walk(package_dir):
            for filename in files:
                file_path = os.path.join(root, filename)
                # TODO: might need to look at other extensions
                if os.path.isfile(file_path) and file_path.endswith(".py"):
                    output_file.write(b"\n\n#### " + file_delim_id.encode() + b":" + filename.encode() + b"\n\n")
                    #print(f"#### {file_path}", file=output_file)
                    with open(file_path, "rb") as input_file:
                        shutil.copyfileobj(input_file, output_file)

    a. 
    # return the path to the output file
    return output_path