hashlib.md5

Question

Hello, what is hashlib.md5 do ??
actually, I wonder if you know what is this function do ??
def md5(fname):
if not os.path.isfile(fname):
return 'NO FILE'
hash_md5 = hashlib.md5()
with open(fname, "rb") as f:
for chunk in iter(lambda: f.read(4096), b""):
hash_md5.update(chunk)
return hash_md5.hexdigest()

Answer 1

Short answer: it returns the md5 hash of a file.
Long answer: it checks that the variable fname is a file, and if it is it reads the file, in binary mode, in 4096 byte chunks and adds each chunk to the variable hash_md5. When the file is read entirely, the function returns the md5 hash of the file's contents.
You can read more about md5 at https://en.m.wikipedia.org/wiki/MD5