Modifying Variables

Modifying Numeric Variables

You can modify a numeric variable by assigning a variable and using the current value it as you assign it.

For example:

number = 5

number = number + 1 Add 4 to number. Number is now 9.

number = number - 3 Subtract 3 from number. Number is now 6.

number = number * 2 Multiply number by 2. Number is now 12.

number = number / 3 Divide number by 3. Number is now 4.

Modifying String Variables

You can modify a string variable in a similar way, but you can only use the + operator for concatenation.

For example:

text = "sea"

text = text + "horse" text is now "seahorse"

text = "horse"

text = "sea" + text text is now "seahorse"

Compound Operators

These type of modifications happen often enough that Python provides shortcut operators that modify, then assign.

These operators are +=, -=, *=, /=, %=