with open("header.html", "r") as top, open("footer.html", "r") as bottom, open(
    "resume.html", "r"
) as middle:
    header = top.read()
    content = middle.read()
    footer = bottom.read()

with open("index.html", "w+") as index:
    index.write(header)
    index.write(content)
    index.write(footer)