I post here the code for histogram using the turtle graphics module, which I posted long time ago in discussion thread. For more special graphs there exist other fancier options, but this tkinter based routine can function in most standard installations of Python.

Example data.txt, like mentioned in module docstring:

Student MarkA MarkB MarkC MarkD MarkF
Alex 5 2 1 0 1
Mark 3 5 1 0 0
Costa 7 4 0 0 3
Rita 0 6 2 2 4
Mary 4 2 3 1 0
John 3 4 2 1 0

Edited 5 Years Ago by pyTony: n/a

#!/usr/bin/python
# -*- coding: latin1 -*-
"""       turtle_histograms.py

            input in file data.txt same directory as this file
            sample input from request in daniweb:

Student MarkA MarkB MarkC MarkD MarkF
Alex 5 2 1 0 1
Mark 3 5 1 0 0
Costa 7 4 0 0 3
Rita 0 6 2 2 4
Mary 4 2 3 1 0
John 3 4 2 1 0

You are free to use this code in your solutions, if you keep the
attribution to original author

Written by Tony Veijalainen, 2010

"""

## little dangerous convenience import mixing the namespace of the program
from turtle import  *

try:
    import psyco                        # python specialising compiler
    psyco.full()
except:
    print 'Install psyco for faster execution'
    pass

## h should be from real window size
h=window_height()-40.0
w=window_width()

def histo(d,w, color1, scale = 10.0):
    """ histogram with
           bar length d,
           width w
           [and maximum d value scale] """
    ## reducing the height when max mark bigger, floating point number
    mult = (window_height()-100.0) / scale
    print "\t%.2f tall" % (mult*d)
    fill(True)
    down()
    color(color1)
    forward(w)
    left(90)
    color(color1)
    forward(d * mult)
    left(90)
    forward(w)
    ## half done: print the value as number in black
    color('black')
    write(d)
    color(color1)
    left(90)
    color(color1)
    forward(d  *  mult)
    left(90)
    fill(False)
    ## some spacing and axis
    color('black')
    forward(w * 1.33)

def main():
    reset()
    setup(width=1000, height=600, startx=0, starty=0)
    ## no delay
    delay(0)
    hideturtle()

    ## move near left side and down of the default window
    up()
    left(180)
    fd(window_width() / 2.0 - 10)
    left(90) ## down
    fd(window_height() / 2.0 - 30) ## leave space for names under
    left(90) ## down bottom complete 360 degrees
    down()

    ## chosen colors, must be more than maximum numbers per line
    colors =  ('red','blue','yellow','green','gray','gold','magenta',
                'orange','brown')
    f =  open('data.txt','r')
    li =  [x.split() for x in f]

    count =  len(li.pop(0)) - 1 ## count numbers and drop the header for now
    if count==1:
        lc=len(colors)-1
        c=0
        w = window_width() / (1.9 * count * len(li))
        print "Each data cycling the colors as only one data point each of",\
            lc, "colors."
    else:
        colors =  colors[:count]
        w =  window_width() / (1.5 * count * len(li))
        print 'Width set to',w

    ## max of marks as integer numbers each line, ignore name
    ## **This line would generate errors if header would not been taken out **
    m =  map(lambda x: max(int(y) for y in (x[1:])),li)
    ## max of all students marks as numbers, **Header dropped allready**
    m =  max([int(x) for x in m])
    print 'Name and ',count,'numbers. Max mark',m

    for info in li:
        print info
        ## go 20 down to write name and come back up
        up()
        right(90)
        forward(20)
        left(90)

        ## must center according to number of values
        forward(count * w / 2.0)
        write(info.pop(0))
        backward(count * w / 2.0)

        left(90)
        forward(20)
        right(90)
        down()

        ## write the histograms for student
        if count==1 and info:
            histo(int(info.pop(0)),w,colors[c],scale =  m)
            c = c % lc + 1
            fd(w / 2.0) ## space without separation lines
        else:
            ## separation line in black
            fd(w / 2.0)
            for c in colors:
                ## allow some last marks missing
                if info: histo(int(info.pop(0)),w,c ,scale =  m)
                else: print '*number missing*',
            print
            left(90)
            color('black')
            fd(0.8*h)
            up()
            backward(0.8*h)
            right(90)
            down()

    ht()
    f.close()
    return "Done!"

if __name__  == '__main__':
    main()
    mainloop()

Specialties:
IT/Science/Contracts/Religious translation/interpreting FIN-ENG-FIN
Python programming

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