i need a module for more involved command line parsing

[Skaperen]

i am wanting to rewrite this C program into Python3. any suggestions for a module that can handle this kind of command line argument parsing?

Output:
lt2a/forums /home/forums 1> rls -h

rls version 0.9.0

syntax:
        rls  [options]  [names]

single letter options may be combined in a single command line token:
        -0 -1 -2 -3 -4 -5 -6 -7 -8 -9 maximum depth
        -a      append '/' to directory names
        -b      show blocks allocated
        -d -D   show date (-d for local, -D for UTC)
        -g -G   show group name (-G for group number)
        -h -H   show this help and quit
        -i      show inode
        -l      show long format
        -L      show number of links
        -m      show mode
        -n      append nanoseconds to time (if available)
        -N      append nanoseconds to time (if available)
        -p      show where link points to
        -q      output nothing
        -s      show size
        -S      show time/date as raw seconds
        -t -T   show time and date (-t for local, -T for UTC)
        -u -U   show user name (-U for number)
        -V      show version number and quit
        +a      select directories (ascending)
        +b      select block devices
        +c      select character devices
        +d      select directories (descending)
        +h +H   show this help and quit
        +f      select regular files
        +l      select symlinks
        +p      select pipes
        +s      select sockets
        +V      show version number and quit

assignment options must be in separate command line tokens:
        cd=<directory>  change to this directory (multiple)
        maxdepth=<num>  maximum recursion depth

lt2a/forums /home/forums 2>

i'm also thinking about extending the options so they can be changed in the middle of the command line and apply to the names that follow them.