Re: [Tutor] Exit from program early
or raise SystemExit Hugo Johan Geldenhuys wrote: > Try using 'sys.exit()' where you want the script to stop if you haven't > supplied enough arguments. > in you example, it looks like it will go on to the else anyway AND print > the string at the end. > > HTH, > Johan > > > Roy Bleasdale wrote: > > >>Hi >> >>In the example below I would like the program to stop if I forgot to >>provide an argument . Though I could do all my processing indented under >>the else statement, I was wondering if there was a command that would allow >>me to halt the program execution early. >> >>Regards, >> >>Roy >> >> >># Example program - Test for valid argument >> >>import sys >> >>if len(sys.argv) < 2: >>print "opps missing an argument" >># Nice if I could stop and exit program here >>else: >>print "Argument provided!!" >># Looking good so go do some stuff >> >>print "Done some stuff" >> >>___ >>Tutor maillist - Tutor@python.org >>http://mail.python.org/mailman/listinfo/tutor >> >> >> > > ___ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Exit from program early
Johan Geldenhuys wrote: > Try using 'sys.exit()' where you want the script to stop if you haven't > supplied enough arguments. > in you example, it looks like it will go on to the else anyway AND print > the string at the end. > > Roy Bleasdale wrote: >>In the example below I would like the program to stop if I forgot to >>provide an argument . Though I could do all my processing indented under >>the else statement, I was wondering if there was a command that would allow >>me to halt the program execution early. Another way to do this is to structure your program with functions. For example you could write it as def doSomeStuff(): # Looking good so go do some stuff if len(sys.argv) < 2: print "opps missing an argument" # Nice if I could stop and exit program here else: print "Argument provided!!" doSomeStuff() print "Done some stuff" Breaking your program up into small functions will generally make it more readable, testable and maintainable that using long stretches of straight-line code. Kent >> >>Regards, >> >>Roy >> >> >># Example program - Test for valid argument >> >>import sys >> >>if len(sys.argv) < 2: >>print "opps missing an argument" >># Nice if I could stop and exit program here >>else: >>print "Argument provided!!" >># Looking good so go do some stuff >> >>print "Done some stuff" >> >>___ >>Tutor maillist - Tutor@python.org >>http://mail.python.org/mailman/listinfo/tutor >> >> >> > > ___ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > > -- http://www.kentsjohnson.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Exit from program early
Try using 'sys.exit()' where you want the script to stop if you haven't supplied enough arguments. in you example, it looks like it will go on to the else anyway AND print the string at the end. HTH, Johan Roy Bleasdale wrote: >Hi > >In the example below I would like the program to stop if I forgot to >provide an argument . Though I could do all my processing indented under >the else statement, I was wondering if there was a command that would allow >me to halt the program execution early. > >Regards, > >Roy > > ># Example program - Test for valid argument > >import sys > >if len(sys.argv) < 2: > print "opps missing an argument" > # Nice if I could stop and exit program here >else: > print "Argument provided!!" > # Looking good so go do some stuff > >print "Done some stuff" > >___ >Tutor maillist - Tutor@python.org >http://mail.python.org/mailman/listinfo/tutor > > > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
