Re: [Tutor] Command line args
Teresa Stanton [EMAIL PROTECTED] wrote No one suggested this. That's great! Wish I had seen it sooner. Thanks, I'll put that in my notebook for further use later. Note that Fileinput is used to iterate over a (set of) file line by line, it doesn't read the entire file into a string as in your original question. You can get round that by using join() to join the lines togvether after reading. Also there are no prompts to stdin if that matters. HTH, Alan G. ___ Tutor maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Command line args
Hi Teresa, Has anyone on this thread already suggested the 'fileinput' module? From what I understand, what 'fileinput' does is exactly what you're asking from: http://mail.python.org/pipermail/tutor/2007-April/053669.html Here's documentation on 'fileinput': http://www.python.org/doc/lib/module-fileinput.html Good luck! ___ Tutor maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Command line args
No one suggested this. That's great! Wish I had seen it sooner. Thanks, I'll put that in my notebook for further use later. -Original Message- From: Daniel Yoo [mailto:[EMAIL PROTECTED] Sent: Friday, April 13, 2007 5:51 PM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: RE: Command line args Hi Teresa, Has anyone on this thread already suggested the 'fileinput' module? From what I understand, what 'fileinput' does is exactly what you're asking from: http://mail.python.org/pipermail/tutor/2007-April/053669.html Here's documentation on 'fileinput': http://www.python.org/doc/lib/module-fileinput.html Good luck! ___ Tutor maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Command line args
Kirk Bailey [EMAIL PROTECTED] wrote Try: filename=sys.arv[1] except Exception, e: This still doesn't help for the problem where a different exception is raised.It really does need to be try: filename = sys.argv[1]: except IndexError: if filename='': filename='foo' # define a default value else: if foo: # detect one likely error foobarcode else: This is invalid syntax it would need to be a chain of if/elif/else another idea is simply detect that there IS a argument; if sys.argv[1]; filename=sys.argv[1] ... which avoids try altogether. Somehow I kinda like this way more. This would still throw an exception if argv[1] doesn't exist because the code still tries to access non existent data. You cannot get away without using the try/except here unless you check the length of argv: if len(sys.argv) 1: filename = sys.argv[1] Now you can check whether filename is valid or not. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Command line args
Kirk Bailey wrote: Teresa Stanton wrote: If one argument to a script is provided I am to take the input from it. I figure that is presented like this: filename = sys.argv[1] Try: the 'try' keyword is not capitalized in Python. filename=sys.arg[1] except exception, E: you should only catch the exception you expect, so you don't accidentally silence an unrelated error. so except IndexError: because you're trying to index into a list that might not have 2 or more elements. filename='FooBar' You said you wanted the input from standard input, so just put a raw_input here. so the new code is: try: filename = sys.argv[1] except IndexError: filename = raw_input(Prompt: ) HTH, -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Command line args
ok, try this: Try: filename=sys.arv[1] except Exception, e: if filename='': filename='foo' # define a default value else: if foo: # detect one likely error foobarcode else: if bar: # detect another one morefoobarcode else: # final catchall for things you # did not anticipate Print 'how the heck did you accomplish this?!? I QUIT~! sys.exit(13) i has something vauely like this in the wiki on the slab right now, except it was addressing the query string. other than that, same problem. another idea is simply detect that there IS a argument; if sys.argv[1]; filename=sys.argv[1] if condition: do something else: do this instead else: filename=foo which avoids try altogether. Somehow I kinda like this way more. Luke Paireepinart wrote: Kirk Bailey wrote: Teresa Stanton wrote: If one argument to a script is provided I am to take the input from it. I figure that is presented like this: filename = sys.argv[1] Try: the 'try' keyword is not capitalized in Python. filename=sys.arg[1] except exception, E: you should only catch the exception you expect, so you don't accidentally silence an unrelated error. so except IndexError: because you're trying to index into a list that might not have 2 or more elements. filename='FooBar' You said you wanted the input from standard input, so just put a raw_input here. so the new code is: try: filename = sys.argv[1] except IndexError: filename = raw_input(Prompt: ) HTH, -Luke -- Salute! -Kirk Bailey Think +-+ | BOX | +-+ knihT Fnord. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Command line args
Teresa Stanton wrote: If one argument to a script is provided I am to take the input from it. I figure that is presented like this: filename = sys.argv[1] Try: filename=sys.arg[1] except exception, E: filename='FooBar' data = open(filename).read() But, if none are provided, input should come from standard input. How do I write that code? TY ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.0.0/750 - Release Date: 4/6/2007 9:30 PM -- Salute! -Kirk Bailey Think +-+ | BOX | +-+ knihT Fnord. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Command line args
Teresa Stanton [EMAIL PROTECTED] wrote If one argument to a script is provided I am to take the input from it. OK This sounds like a homework so I can't give you a direct answer but only some things to consider. I figure that is presented like this: filename = sys.argv[1] data = open(filename).read() So far so good but how will you know whether there is anyting in sys.argv to read? But, if none are provided, input should come from standard input. Standard input is where you normally get input in interactive programs. How do you normally get a user to giove you information? You'll find more about receiving input from users in the Talking to the User topic of my tutorial. -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Command line args
* Teresa Stanton [EMAIL PROTECTED] [070407 18:52]: If one argument to a script is provided I am to take the input from it. I figure that is presented like this: filename = sys.argv[1] data = open(filename).read() But, if none are provided, input should come from standard input. How do I write that code? if len(sys.argv) 1: fp = file(sys.argv[1]) else: fp = sys.stdin data = fp.read() if fp is not sys.stdin: fp.close() Andreas ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
