Hey everyone. I would really appreciate some help. I'm currently building a program in Python 2.6 for an introductory Comp Sci class. The program is supposed to use functions to read a text file from a URL, parse the data into tokens, and use the data to calculate a sort of average 'course grade' for hypothetical students using the URL data.
This is all something I've done before, only I didn't use functions. Now that I'm using them, I'm running into errors and need help.
Specifically, when I try to run the program I get an error like this:
Traceback (most recent call last): File "C:\Users\Denis Walker\Documents\CSM\CSCI 101\CourseGradeFunctions.py", line 35, in <module> for li in lines[1:] : TypeError: 'NoneType' object is unsubscriptable
Here is the code for what I have so far.
theURL = "http://inside.mines.edu/~khellman/teaching/csci101/qo/coursegrades.dat" def download(theURL): import urllib2 urlConnection = urllib2.urlopen( theURL ) lines = urlConnection.readlines() print lines def parse(li): theLine = lines[li] theTokens = theLine.split() theValues =  theValues.append( theTokens ) t = 1 while t < len(theTokens) : theValues.append( float( theTokens[t] ) ) t = t + 1 def courseGrade(): CWID = theValues fi = theValues a = theValues b = theValues p = theValues q = theValues t = theValues c = (p*.2 + q*.1 + a*.15 + b*.2 + fi*.25 + t*.1) print c def printStudent( outfile, cg, scores ): f = file( "FunctionCourseGrades.txt", "a" ) f.write("%-s %10.2f %10.2f %10.2f %10.2f %10.2f %10.2f %10.2f\n" % (CWID, c, fi, a, b, p, q, t)) lines = download(theURL) for li in lines[1:] : scores = parse(1) cg = courseGrade(scores) printStudent( f, cg, scores ) f.close() print "Please open FunctionCourseGrades.txt to see the listed scores including calculated course grades."