I got a permisson denied error when I tried to write a file in jupyter.

import gzip 
file=[
    "train-images-idx3-ubyte.gz",
    "train-labels-idx1-ubyte.gz",
    "t10k-images-idx3-ubyte.gz",
    "t10k-labels-idx1-ubyte.gz"
]

For fin file:
    raw_file="/"+f.replace(".gz", "")
    with gzip.open(f, "rb") as gz:
        body=gz.read()
        with open(raw_file, "wb") as raw_w:
            raw_w.write(body)