hi, thanks for the explanation. if i print out line=line.split(), below is the result: ['Platform:', 'PC'] ['Tempt', ':', '25'] ['TAP0', ':0'] ['TAP1', ':1'] [] ['+++++++++++++++++++++++++++++++++++++++++++++'] ['Port', 'Chnl', 'Lane', 'EyVt'] ['+++++++++++++++++++++++++++++++++++++++++++++'] ['0', '1', '1', '75'] ['0', '1', '2', '10'] ['0', '1', '3', '-1'] ['0', '1', '4', '-1'] ['0', '1', '5', '10'] ['+++++++++++++++++++++++++++++++++++++++++++++'] ['Time:', '20s']
that's why port, channel, lane, eyvt = line.split() will give traceback error due to there are only 2 values in the 1st line. how to make the line search at line Port, Chnl, Lane, EyVt? thanks tcl76 > Date: Mon, 10 Jan 2011 00:48:51 +1100 > From: st...@pearwood.info > To: tutor@python.org > Subject: Re: [Tutor] Open a text file, read and print pattern matching > > tee chwee liong wrote: > > hi, > > > > there is error when running the code: > >> Traceback (most recent call last): > >> File "C:/Python25/myscript/log/readfile9.py", line 5, in <module> > >> port, channel, lane, eyvt = line.split() > >> ValueError: need more than 2 values to unpack > > > > the error is due to below line code: > >> port, channel, lane, eyvt = line.split() > > > > pls advise. > > > You have a line with only 2 words, and you are trying to unpack it into > four variables. Four variables on the left, 4 values on the right works: > > >>> a, b, c, d = "sentence with four words".split() > >>> print a > sentence > >>> print b > with > >>> print c > four > >>> print d > words > > But 4 variables on the left, 3 on the right does not: > > >>> a, b, c, d = "sentence with three".split() > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > ValueError: need more than 3 values to unpack > > Likewise: > > >>> a, b, c, d = "two words".split() > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > ValueError: need more than 2 values to unpack > > >>> a, b, c, d = "word".split() > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > ValueError: need more than 1 value to unpack > > > > > -- > Steven > > > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor
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