Practice With Arithmetic Operators
Practice these programming examples to internalize these concepts.
4. Unary Arithmetic Operations
A unary mathematical expression consists of only one component or element, and in Python the plus and minus signs can be used as a single element paired with a value to return the value's identity (
+), or change the sign of the value (
Though not commonly used, the plus sign indicates the identity of the value. We can use the plus sign with positive values:
i = 3.3 print(+i)
When we use the plus sign with a negative value, it will also return the identity of that value, and in this case it would be a negative value:
j = -19 print(+j)
With a negative value, the plus sign returns the same negative value.
The minus sign, alternatively, changes the sign of a value. So, when we pass a positive value we'll find that the minus sign before the value will return a negative value:
i = 3.3 print(-i)
Alternatively, when we use the minus sign unary operator with a negative value, a positive value will be returned:
j = -19 print(-j)
The unary arithmetic operations indicated by the plus sign and minus sign will return either the value's identity in the case of
+i, or the opposite sign of the value as in