My "main" routine for Project Euler. Runs that program specified by arg1, times the execution and prints the answer and timing The timer is rather too coarse and the details (real time vs. CPU time) differ from Linux to WIndows.

maintimer.py

from time import clock
if __name__ == "__main__":
    import sys
    print "args=", sys.argv
    x="from " + sys.argv[1] + " import main"
    print x
    exec x
    tstart=clock()*1000
    answer=main()
    tend=clock()*1000
    print "answer=", answer
    print "tstart=", "%e" % tstart, "tend=", "%e" % tend
    print "runtime(CPU milliseconds)=", str(tend-tstart)