How Write Part of a Binary Array?

[Assembler]

Windows 7
Python 3.8.10

I wish to read a binary file, and then write it's data to a different file, skipping the first 16 bytes.
How do I do that?

Python pseudo code:

oldfile = open("oldfile.dat", mode="rb")	#Open old file for binary read
newfile = open("newfile.dat", mode="wb")	#Open new file for binary write

olddata = oldfile.read()					#Read the original file

#How do I write olddata, after the first 16 bytes, into newfile.dat?
# newfile.write( From olddata[16] ?? )

[Gribouillis]

If the file's size is not too big, you could use pathlib directly

from pathlib import Path
Path('newfile.dat').write_bytes(Path('oldfile.dat').read_bytes()[16:])

If it is a large file, you may want to process it by chunks. There is an interesting piece of code in the documentation of the iter() function. Here is how it applies here

from functools import partial
CHUNK = 8192  # choose your preferred value
with open('oldfile.dat', 'rb') as filein:
    filein.read(16)
    with open('newfile.dat', 'wb') as fileout:
        for block in iter(partial(filein.read, CHUNK), b''):
            fileout.write(block)