[Tutor] line iteration in a file

[richard kappler]

Figured out the string delimiters problem, thanks for all the help. Now
I've run into another.

I've used the re.finditer that I think it was Peter suggested. So I have:

for line in file:
s = line
t = [m.start() for m in re.finditer(r"]", s)]
q = len(t)

which works fine, in testing it finds the number and position of the ]'s in
any line I throw at it. I then wrote a series of if/elif statements based
on q, in other words

if q == 1:
do something
elif q == 2:
do something else
elif q == 3:
do a third thing
else:
pass

as I looked through enough example to figure out that the most ]'s I can
have is 3, but the pass is there just in case.

I keep getting a list index out of range error, and my best guess is that
it's because t and q are set on the first line read, not each line read, is
that right? If not, what might be the problem and either way, how do I fix
it?

regards, Richard
who is proving to his Linux box that he is an idiot pretty regularly

[Cameron Simpson]

Post by richard kappler
Figured out the string delimiters problem, thanks for all the help. Now
I've run into another.
s = line
t = [m.start() for m in re.finditer(r"]", s)]
q = len(t)
which works fine, in testing it finds the number and position of the ]'s in
any line I throw at it. I then wrote a series of if/elif statements based
on q, in other words
do something
do something else
do a third thing
pass
as I looked through enough example to figure out that the most ]'s I can
have is 3, but the pass is there just in case.
I keep getting a list index out of range error, and my best guess is that
it's because t and q are set on the first line read, not each line read, is
that right? If not, what might be the problem and either way, how do I fix
it?

Please post a self contained example (i.e. small complete code, not snippets)
and a transcribe of the full error message with stack backtrace. What you have
above is not enough to figure out what is going wrong. If what you display
above is accurate then t and q are set for every line read.

Another remark, what is the use of your "else: pass" code? Normally one would
put some action here, such as raising an exception for the unhandled value or
issuing a warning.

Cheers,
Cameron Simpson <***@zip.com.au>

My computer always does exactly what I tell it to do but sometimes I have
trouble finding out what it was that I told it to do.
- Dick Wexelblat <***@ida.org>
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[richard kappler]

SOLVED: Sometimes one just has to be an idiot. One must remember that
computers count from zero, not from one. Changes my list indexes to reflect
that small but crucial fundamental point, and all worked fine.

regards, Richard

Post by richard kappler
Figured out the string delimiters problem, thanks for all the help. Now
I've run into another.
s = line
t = [m.start() for m in re.finditer(r"]", s)]
q = len(t)
which works fine, in testing it finds the number and position of the ]'s
in any line I throw at it. I then wrote a series of if/elif statements
based on q, in other words
do something
do something else
do a third thing
pass
as I looked through enough example to figure out that the most ]'s I can
have is 3, but the pass is there just in case.
I keep getting a list index out of range error, and my best guess is that
it's because t and q are set on the first line read, not each line read, is
that right? If not, what might be the problem and either way, how do I fix
it?
regards, Richard
who is proving to his Linux box that he is an idiot pretty regularly
--
Windows assumes you are an idiot…Linux demands proof.