Seperating CSV rows into new, seperate files
anthonybol2 at netscape.net
Sun Aug 15 22:45:15 CEST 2004
With some off post help I was able to come up with this little ditty
of a script but it still has one more problem. When I run the script
it creates new files for each specific class. While talking through
the logic with a friend, I realized that the gradebook software that
will import the list will ignore duplicate rows. Not the best
solution but I need it to work this week. In any case, it appears
that the new files have some sort of additional line terminator that
creates a blank row in the outputted file making the importing of the
list impossible. This is based on the fact that when I try to open
the new files in MS Excel, they have blank rows after each row of
data. If I open them in a text editor such as Notepad, they look
identical to the source file (which can be imported to the gradbook
Is there a way to SEE the newline terminators?
How can I use the csv.writer() to make sure there are no extra lines?
TEACHER_NAME = 4
COURSE_TITLE = 9
COURSE_NUMBER = 8
SECTION = 10
# Open the input file and read the file to memory (may be too big a
file? ~ 2MB?).
reader = csv.reader(file("sample.csv"))
We need to remove spaces from the fields for better formatting of
the file name
regex = re.compile('[^.A-Za-z0-9-_]')
filename = '%s_%s_%s_section%s.txt' % (teacher, title, number,
return regex.sub('_', filename)
for row in reader:
filename = createFilename(row[TEACHER_NAME], row[COURSE_TITLE],
fileobj = file(filename, 'a')
newfile = csv.writer(fileobj)
Thanks to those who have helped!
Maik Röder <roeder at berg.net> wrote in message news:<mailman.1653.1092491778.5135.python-list at python.org>...
> Hi TobyB,
> > Hi,
> > I've searched the group and need more information and guidance on this
> > issue I need to resolve next week. I work for the local school system
> > and I am working on a way to parse a CSV file of class lists from MS
> > Excel. It is a ~2MB file with all teachers and all their classes in
> > it. I thought I would use Python to do this since many people I know
> > tell me how great it is.
> Pyhton is a good choice for treating texts.
> > The real sticking point is there are
> > duplicates of each teacher's classes embedded in the file (don't ask
> > why). I want to break up the source file into the seperate class
> > files without duplication and use the teachers name, coursecode and
> > section in the filename.
> > Example Data:
> > Last Name First Name Grade Period Teacher Name
> > SMITH JOHN 8 1 JONES SALLY
> > Student ID Course Code Course Title
> > 12345678 1234 ALGEBRA I
> > Course Section Session
> > 1 0
> > The course code and section number are the same in the duplicate
> > classes. The difference is that the session number changes. I'm
> > thinking that I will need to somehow iterate through the lines and
> > break the class when the course code changes and/or section change
> > (course codes can be the same but section numbers change with each
> > class). Then I have to monitor the session number to see if there is
> > a duplicate course code and section but a different session number
> > would indicate that the class is a duplicate. Essentially, the session
> > number will be 0, 1, or 2 for a total of three lists of the same
> > class. Hopefully that makes sense. Again don't ask why the data is
> > like this.
> > My humble attempts have not been very successful. I've been trying
> > the csv modules to read the file but I am not sure how to procede
> > after that.
> > Any guidance is greatly appreciated.
> Use Python lists and dictionaries.
> Best regards,
> Maik Röder
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