Added calculator in python
Added calculator in python

IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,psushaanth23/HacktoberFest,psushaanth23/HacktoberFest,IEEE-NITK/HacktoberFest,psushaanth23/HacktoberFest,IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,psushaanth23/HacktoberFest,psushaanth23/HacktoberFest,IEEE-NITK/HacktoberFest,IEEE-NITK/HacktoberFest,psushaanth23/HacktoberFest,IEEE-NITK/HacktoberFest,psushaanth23/HacktoberFest