In this instance the trackback was somewhat unhelpful.There problem was
here:
file = open(filename, 'r')
should be
file = open(a, 'r')
args should be passed within the getopt riff
On Fri, Jul 17, 2009 at 11:08 AM, MRAB <pyt...@mrabarnett.plus.com> wrote:
> LoD MoD wrote:
>
>> I am having trouble extending my option parsing.
>> Any help is appreciated:
>>
>> import sys
>> import getopt
>> import time
>>
>> def tail(file):
>> while 1:
>> where = file.tell()
>> line = file.readline()
>> if not line:
>> time.sleep(1)
>> file.seek(where)
>> else:
>> print line, # already has newline
>>
>> def main():
>>
>> # parse command line options
>> try:
>> opts, args = getopt.getopt(sys.argv[1:], "hf:", ["help",
>> "filename="])
>> except getopt.error, msg:
>> print msg
>> print "for help use --help"
>> sys.exit(2)
>> # process options
>> for o, a in opts:
>> if o in ("-h", "--help"):
>> print __doc__
>> sys.exit(0)
>> if o in ("-f", "--filename"):
>> print "Parsing F argument"
>> file = open(filename, 'r')
>> print file
>>
>> # process arguments
>> for arg in args:
>> process(arg) # process() is defined elsewhere
>>
>> if __name__ == "__main__":
>> main()
>>
>> Yields this error:
>>
>> localhost:src gsery$ python logTail.py /var/log/system.log
>> Traceback (most recent call last):
>> File "logTail.py", line 52, in <module>
>> main()
>> File "logTail.py", line 49, in main
>> process(arg) # process() is defined elsewhere
>> NameError: global name 'process' is not defined
>>
>> The trackback tells you what's wrong: you haven't defined 'process'. The
> comment says it's defined elsewhere, but neither I nor Python can see
> it! :-)
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>
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