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/usr/lib/python2.7/dist-packages/SimPy/stepping.py is in python-simpy 2.3.1-1.

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# coding=utf-8
"""
This is a small utility for interactively stepping through a simulation.

Usage:
    import stepping
    (simulation model)
    stepping.stepping(Globals) # instead of 'simulate(until = endtime)

"""
import sys


def stepping(glob):
    asim = glob.sim
    help = {'s':"next event",'r':"run to end",'e':"end run",
           '<time>':"skip to event at <time>",'l':"show eventlist",
           'p<name>':"skip to event for <name>",'h':"help"}
    evlist = asim._timestamps
    while True:
        if not evlist:
            print("No more events at t=%s"%asim.now())
            break
        tEvt = evlist[0][0]
        who = evlist[0][2]
        while evlist[0][3]: #skip cancelled event notices
            step()
        print("\nTime now: %s, next event at: t=%s for process: %s "\
              %(asim.now(),tEvt,who.name))

        while True:
            if sys.version_info.major == 2:
                input = raw_input
            cmd = input("Command ('h' for help): ")
            if cmd == "h":
                for i in help:
                    print(i, ":", help[i])
            else:
                break
        try:
            nexttime = float(cmd)
            while asim.peek() < nexttime:
                asim.step()
        except:
            if cmd == 's':
                asim.step()
            elif cmd == 'r':
                while evlist:
                    asim.step()
                print("Run ended at t=%s"%asim.now())
                break
            elif cmd == 'e':
                asim.stopSimulation()
                break
            elif cmd == 'l':
                print("Events scheduled: \n%s"%asim.allEventNotices())
            elif cmd[0] == 'p':
                while evlist and evlist[0][2].name != cmd[1:]:
                    asim.step()
            else:
                print("%s not a valid command" % cmd)