>>> 11 + 56 # this is a comment.  It's meant only for humans.
67
>>> 23 - 52 # The '#' tells python to ignore the rest of the line
-29
>>> 2 **5 # 2 to the power of 5
32
>>> 7/3 # the / is division - where did the extra 1 go?
2
>>> 7 % 3 # The % is the remainder ("mod") operator
1
>>> 7.0 / 3 # if one or both of the operands is a floating point number (has a decimal point)
2.3333333333333335
>>> 7/3.0 # then the operation is floating point division
2.3333333333333335
>>> 7.0 / 3.0 
2.3333333333333335
>>>