Variables Example… Handy for beginners. Even you can consult this book as well Book # Non-Programmer's_Tutorial_for_Python_3
Calculate Positive Factorial Numbers…
Thompson’s Construction help is taken from Ian Mcloughlin video available on moodle.
Shunt Yard Algorithm , help is taken from Ian Mcloughlin video , visit and research the website http://www.oxfordmathcenter.com/drupal7/node/628
Debugged code is updated , there was a syntax error at line 16 earlier but now it's working perfectly