strange problems with code generation

[John Machin]

Eric_Dexter at msn.com wrote:
> I am writing out zero byte files with this (using python 2.5).  I have
> no idea why I am having that problem

Which output file(s) do you mean, temp.orc or temp.sco or both?
Two possible causes outlined below.

> I am also looking for an example
> of readlines where I can choose a number of lines say lines 12 to 14
> and then write them back to disk.

To the same file? There was a long thread on updating text files very
recently.

>  any help would be apreaceted.

Have you considered deploying a spelling checker?

>
> import sys as sys2
> import os as os2

Why the obfuscation?

>
> def playscoreinrange(from_file, fromline, toline):
>     "untested way to play a series of lines from a orc, sco combination
> line 14 may not be correct"

and which is line 14?? According to my count, it is the blank line
after "outfile2 = open('temp.orc', 'w') "!!

>     print(from_file)
>     fromfile = os2.path.basename(from_file)
>     print(fromfile)
>
>     orcfilename = fromfile[:-4] + '.orc'
>     print(orcfilename)
>     infile2 = open(orcfilename, 'r')
>     outfile2 = open('temp.orc', 'w')
>
>     for line in infile2:
>         outfile2.write(line)
>
>
>     infile = open(fromfile, 'r')

infile is not used

>     outfile = open('temp.sco','w')
>
>     data = sys2.stdin.readlines()
>     print(data)

and how many lines were there in data when you printed it?

>     for linenumber in range(fromline, toline):

Consider the possibility that fromline >= toline (which may be caused
by either or both not being of a numerical type).

Did you mean range(fromline, toline + 1) ?

do this:
print repr(fromline), type(fromline)
print repr(toline), type(toline)

BTW, print is a *statement*, not a function!

>         outfile.writeline(data[linenumber])

outfile.writeline() ???

| Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
(Intel)] on win
32
| Type "help", "copyright", "credits" or "license" for more
information.
| >>> f = open('fubar.txt', 'w')
| >>> f.writeline('bzzzzt!\n')
| Traceback (most recent call last):
|   File "<stdin>", line 1, in <module>
| AttributeError: 'file' object has no attribute 'writeline'

So, the body of your loop wasn't executed (or you overlooked the
exception, or that wasn't the code that was executed) -- so it looks
like the range was empty (or the problem occurred further upstream).

> https://sourceforge.net/projects/dex-tracker
> http://www.dexrow.com
>
>
>     os2.startfile('temp.bat')

and what does this do?? Read temp.orc and/or temp.sco before you've
closed the file(s)?

Where is the code that was used to call this playscoreinrange function?

HTH,
John