program wanted for Posix

[Skaperen]

maybe you know the "head" command. maybe you know the "tail" command. i'd like to see someone create a "headtail" command that outputs the head of a file followed by the tail of that same file. if the file is so small that these would overlap or duplicate, then it should just output the whole file. arguments should allow specifying how many lines for the head part and how many lines for the tail part. and, of course, it must be written in Python3.