lmac wrote:
> Hi there,
> i want to use an long int from an list which i got from my function
> find_lineno().
> But i got this error and i don't understand why i can not use this long
> as an argument.
You have the arguments to file.seek() reversed.
> Where do i find a good documentation on errors so that i complete
> understand what
> the heck is going on.
>From http://docs.python.org/lib/bltin-file-objects.html
seek( offset[, whence])
Set the file's current position, like stdio's fseek(). The whence argument
is optional and defaults to 0 (absolute file positioning); other values are 1
(seek relative to the current position) and 2 (seek relative to the file's
end).
Kent
> Many thanks.
>
> ERROR:
> ---
> Traceback (most recent call last):
> File "./extrmails.py", line 42, in ?
> inputfile.seek(0,li)
> IOError: [Errno 22] Invalid argument
> ---
>
>
> CODE-START:
> -
>
> inputfile=open("mails","rt")
>
> # --
> def reset_inputfile():
> inputfile.seek(0,0)
>
> # --
> def find_lineno(string):
> f = -1
> a = "start"
> found_lines = []
> reset_inputfile()
>
> while len(a) != 0:
> a = inputfile.readline()
> f = a.find(string)
> if f != -1:
> found_lines.append(inputfile.tell())
>
> return found_lines
>
> # --
>
> from_lineno=find_lineno("From:")
> subj_lineno=find_lineno("Subject:")
>
> print len(subj_lineno)
> print len(from_lineno)
>
> reset_inputfile()
>
> for li in subj_lineno:
> inputfile.seek(0,li)<-- ???
> ...
> ..
> --
> CODE-END
>
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>
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