NoComments.py

#!/usr/bin/python
#NoComments.py
#Python2.7
#Chris Clarke
#13.08.2015

"""
Count number of lines of code, number of commented lines,
 number of blank lines and total lines in a Python module.
"""

def line_count (fname):
    with open (fname) as file:
        lines = file.readlines ()
    codelines,commentlines,blanklines,total = 0,0,0,0
    comment=False
    for line in lines:
        if len(line) <= 1:
            blanklines += 1
        else:
            i=0
            #locate first non-whitespace character on line
            while line[i]==' ' or line[i]=='\t':
                i += 1
            #check if first non-whitespace is "#"
            if line[i]=='#':
                commentlines += 1
            #check for """ or ''' (start or end of multi-line comment)
            elif line[i:i+3]=="\"\"\"" or line[i:i+3]=="\'\'\'":
                #change comment status
                comment = not comment
                commentlines += 1
            else:
                #check comment status
                if comment:
                    #increment commentlines
                    commentlines += 1
                else:
                    #ye gods! it's actually a line of Python code!!
                    codelines += 1
        total += 1
    return codelines,commentlines,blanklines,total

def main():
    fname = raw_input('Filename for Python module? ')
    codelines,commentlines,blanklines,total = line_count(fname)
    print "Module contains",
    print "%d lines code, %d commented lines, %d blank lines, %d total." % \
    (codelines,commentlines,blanklines,total)

main()