2.5. Operators and operandsΒΆ
Operators are special symbols that represent computations like addition and multiplication. The values the operator is applied to are called operands.
The operators +
, 
, *
, /
, and
**
perform addition, subtraction, multiplication, division,
and exponentiation, as in the following examples:
There was a change in the division operator between Python 2.x and Python 3.x. In Python 3.x, the result of this division is a floating point result:
The division operator in Python 2.0 would divide two integers and truncate the result to an integer:
>>> minute = 59
>>> minute/60
0
To obtain the same answer in Python 3.0 use floored ( //
integer) division.
In Python 3.0 integer division functions much more as you would expect if you entered the expression on a calculator.
 0
 If the two values are both integers (whole numbers) you will normally get an integer (whole number) result in older Python environments. But, this book is using Python 3 so you get a decimal result.
 1
 This would be correct if the result was rounded up before the values after the decimal point were thrown away, but it does not do this.
 0.75
 While this isn't the what older Pyton development environments would return, in this book we are using Python 3 so it returns a decimal result.
 0.25
 This would be correct if it was
1 / 4
,1.0 / 4
, or1 / 4.0
csp1024: What is the result of 3 / 4
?
csp1025: What operator (symbol) would you use to truncate division in Python 3.0?

csp1026: Match each expression with the operation it performs.
Try assigning values to these variables and testing out the espressions in your python interpreter.
 x + y
 addition
 x  y
 subtraction
 x * y
 multiplication
 x / y
 division
 x % y
 remainder (modulus)
 x // y
 floored division
 x ** y
 exponentiation