[CentralOH] Pipeness _Within_ Python

[jep200404 at columbus.rr.com]

How would one do the following[1] entirely within Python[2]? 

    python mogrify.py <(cat "$filename" \
    | tee >(sha1sum >&3) >(wc -c >&4) /dev/null \
    | gunzip | tee >(sha1sum >&5) >(wc -l -c >&6) /dev/null)



[1] Calculate sha1sums and byte count of compressed and 
    uncompressed file, reading file only once (without using 
    temporary files and without saving file in memory).

[2] Is it the wrong thing to ask for, 
    considering Python nature and Unix shell script nature?  
    If so, what question should I ask? 
    http://www.catb.org/~esr/writings/unix-koans/ten-thousand.html

    By the way, while looking for [2], I found "Why Python?"[4]

[4] "Why Python?" 
    http://www.linuxjournal.com/article/3882
    Guido van Rossum told me [Eric Raymond] once he thought 
    this article was the single most effective piece of Python 
    evangelism ever. For some years it was the single most 
    popular back article on the LJ website.