The D program, student_grades.d: /* student_grades.d Author: Vasudev Ram Web site: https://vasudevram.github.io Blog: http://jugad2.blogspot.com Product store: https://gumroad.com/vasudevram Adapts code from: http://nomad.so/2015/08/more-hidden-treasure-in-the-d-standard-library/ */ import std.stdio; import std.algorithm; import std.array; import std.conv; import std.functional; // Set up the functional pipeline by composing some functions. alias sumString = pipe!(split, map!(to!(int)), sum); void main(string[] args) { // Data to be transformed: // Each string has the student name followed by // their grade in 5 subjects. auto student_grades_list = [ "A 1 2 3 4 5", "B 2 3 4 5 6", "C 3 4 5 6 7", "D 4 5 6 7 8", "E 5 6 7 8 9", ]; // Transform the data for each student. foreach(student_grades; student_grades_list) { auto student = student_grades[0]; // name auto total = sumString(student_grades[2..$]); // grade total writeln("Grade total for student ", student, ": ", total); } } Compile it with: $ dmd student_grades.d The Python program is StdinToPDF.py which is part of the xtopdf toolkit, at: http://bitbucket.org/vasudevram/xtopdf Code for StdinToPDF.py is below. It requires xtopdf / PDFWriter, available from the above URL. # StdinToPDF.py # Read the contents of stdin (standard input) and write it to a PDF file # whose name is specified as a command line argument. # This program is part of the xtopdf toolkit: # https://bitbucket.org/vasudevram/xtopdf import sys from PDFWriter import PDFWriter try: with PDFWriter(sys.argv[1]) as pw: pw.setFont("Courier", 12) for lin in sys.stdin: pw.writeLine(lin) except Exception, e: print "ERROR: Caught exception: " + repr(e) sys.exit(1) Run it with: $ student_grades | python StdinToPDF.py sg.pdf The student grade results will now be in the PDF file sg.pdf.