Operators in Python

Andrei Maksimov

Andrei Maksimov

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In this chapter, you’ll learn the basic Python operators. All of them are quite important because you’ll be using them a lot on a daily basis as a Cloud Automation Engineer. We’ll use real-life examples wherever is possible.

What are operators in Python?

Operators are special symbols in Python that allows you to do arithmetic or logical operations.

The values that an operator acts on are called operands.

For example:

>> 1 + 5
6

In the example above:

  • + is the operator that does the sum operation.
  • 1 and 5 are the operands
  • 6 is the result/output of the operation
1. Operators in Python - Generic example

Assignment operators

Assignment Operators in Python are used for assigning the value of the right operand to the left operand.

There are multiple different assignment operators available for you in Python.

Let’s take a look at the most commonly used ones.

Simple assignment ( = )

The simple assignment operator assigns a value to a single or multiple variable(s).

Here are some of examples:

>> x = 10
>> print(x)
10

>> x = y = z = 10
>> print(x)
10
>> print(y)
10
>> print(z)
10

>> x, y, z = 1, 2, 3
>> print(x)
1
>> print(y)
2
>> print(z)
3

Interpreter output at Cloud9 IDE:

2. Operators in Python - Simple assignment

Here’s a classic example showing how to swap a variable values:

>> x = 0
>> y = 1
>> x, y = y, x
>> print(x)
1
>> print(y)
0

Interpreter output at Cloud9 IDE:

3. Operators in Python - Variables swap

Increment assignment ( += )

The increment assignment operator adds a value to the variable and assigns the result to the same variable.

>> x = 15
>> x += 2
>> print(x)
17

The alternative way of doing an increment assignment is to use it’s longer form:

>> x = 15
>> x = x + 2
>> print(x)
17

Both examples will produce completely the same results.

4. Operators in Python - Increment assignment

Decrement assignment ( -= )

The decrement assignment operator subtracts a value from the variable and assigns the result to that variable.

>> x = 33
>> x -= 3
>> print(x)
30

# An alternative way of decrementing variable value
>> x = 33
>> x = x - 3
>> print(x)
30

Interpreter output at Cloud9 IDE:

5. Operators in Python - Decrement assignment

Multiplication assignment ( *= )

The multiplication assignment operator multiplies the variable by a value and assigns the result to that variable.

Here’s an explanation example:

>> x = 10
>> x *= 3
>> print(x)
30

# An alternative way of multiplying a variable value
>> x = 10
>> x = x * 3
>> print(x)
30

Interpreter output at Cloud9 IDE:

6. Operators in Python - Multiplication assignment

Division assignment ( /= )

The division assignment operator divides the variable by a value and assigns the result to that variable.

Here’s an explanation example:

>> x = 10
>> x /= 2
>> print(x)
5.0

# An alternative way of dividing a variable value
>> x = 10
>> x = x / 2
>> print(x)
5.0

Interpreter output at Cloud9 IDE:

7. Operators in Python - Division assignment

Other operators

Similarly to increment, decrement, multiplication and division operators, Python supports:

But those operators are rarely faced in cloud automation activities.

Arithmetic operators

Arithmetic operators are used to perform mathematical operations like addition, subtraction, multiplication, etc.

Addition ( + )

The addition operator returns the sum of two expressions.

For example:

>> 1 + 5
6

Interpreter output at Cloud9 IDE:

1. Operators in Python - Addition operator

Subtraction ( – )

The subtraction operator returns the difference of two expressions.

>> 2 - 3
-1

Interpreter output at Cloud9 IDE:

8. Operators in Python - Subtraction operator

Multiplication ( * )

The multiplication operator returns the product of two expressions.

# integer multiplication example
>> 2 * 5
10

# float multiplication example
>> 2 * 5.0
10.0

Interpreter output at Cloud9 IDE:

9. Operators in Python - Multiplication operator

Power ( ** )

The power operator returns the value of a numeric expression raised to a specified power.

In addition to the power operator, Python has a pow() function, which acts in the same way.

Note: pow(0, 0) and 0 ** 0 to be 1, as is common for programming languages.

>> 3 ** 3
27
>> 3 ** 3.0
27.0
>> 3.0 ** 3
27.0
>> 9 ** 0.5
3.0
>> 3 ** -3
0.037037037037037035

Interpreter output at Cloud9 IDE:

10. Operators in Python - Power operator

Division ( / )

The division operator returns the quotient of two expressions.

>> 3 / 1
3.0
>> 3 / 0.7
4.285714285714286

Interpreter output at Cloud9 IDE:

11. Operators in Python - Division operator

Other operators

Similarly to the mentioned arithmetic operators, Python supports:

But those operators are rarely faced in cloud automation activities.

Relational operators

Equal ( == )

The equal operator returns a Boolean value stating whether two expressions are equal or not.

# strings
>> 'xyz' == 'xyz'
True
>> 'Xyz' == 'xyz'
False

# integers
>> 1 == 1
True
>> 1 == 1.0
True

# objects
>> (1, 2) == 10
False

# variables
>> x = 5
>> y = 6
>> x == y
False

Interpreter output at Cloud9 IDE:

12. Operators in Python - Equal operator

Not equal (!=)

The not equal operator returns a Boolean value stating whether two expressions are not equal.

# strings
>> 'xyz' != 'xyz'
False
>> 'Xyz' != 'xyz'
True

# integers
>> 1 != 1
False
>> 1 != 1.0
False

# objects
>> (1, 2) != 10
True

# variables
>> x = 5
>> y = 6
>> x != y
True

Interpreter output at Cloud9 IDE:

13. Operators in Python - Not equal operator

Greater than ( > )

Greater than operator returns a Boolean stating whether one expression is greater than the other.

>> 2 > 3
False
>> 4 > 3
True

Interpreter output at Cloud9 IDE:

14. Operators in Python - Greater than operator

Greater than or equal ( >= )

Greater than or equal operator is similar to greater than operator and returns a Boolean stating whether one expression is greater than or equal the other.

>> 3 >= 2
True
>> 3 >= 3
True

Interpreter output at Cloud9 IDE:

15. Operators in Python - Greater than or equal operator

Less than ( < )

Less than operator returns a Boolean stating whether one expression is less than the other.

>> 3 < 3
False
>> 1 < 3
True

Interpreter output at Cloud9 IDE:

16. Operators in Python - Less than operator

Less than or equal ( <= )

The less than or equal operator returns a Boolean stating whether one expression is less than or equal the other.

>> 4 <= 3
False
>> 3 <= 3
True

Interpreter output at Cloud9 IDE:

17. Operators in Python - Less than or equal operator

Boolean operators

There are three boolean operators in Python available: and, or and not.

Let’s review them one by one.

and

The and boolean operator returns the first operand that evaluates to False or the last one if all are True.

>> True and False
False
>> True and True
True

Interpreter output at Cloud9 IDE:

18. Operators in Python - And operator

or

The or boolean operator returns the first operand that evaluates to True or the last one if all are False.

>> False or True
True
>> False or False
False

Interpreter output at Cloud9 IDE:

19. Operators in Python - Or operator

not

The not boolean operator returns a Boolean that is the reverse of the logical state of an expression.

# Example 1
>> not True
False
>> not False
True

# Example 2
>> True and not True
False
>> True and not False
True
>> True or not False
True
>> True or not True
True

Interpreter output at Cloud9 IDE:

20. Operators in Python - Not operator

Membership operators

in

The in operator returns a Boolean stating whether the object exists in the container.

>> 'x' in 'xyz'
True
>> 5 in [3, 5, 7, 9]
True

Interpreter output at Cloud9 IDE:

21. Operators in Python - In operator

Conditional operator

if else

The if else conditional operator returns either value depending on the result of a Boolean expression.

In Python, conditional operator is similar to the if else statement.

It is also called a ternary operator since it takes three operands:

# Example 1
>> x = 5
>> y = 6
>> z = 1 if x < y else 0
>> print(z)
1

# Example 2
>> uptime = 100
>> status = 'green' if uptime > 99 else 'yellow'
>> print(status)
gren

Interpreter output at Cloud9 IDE:

22. Operators in Python - Ternary operator

String operators

Concatenation ( + )

If concatenation operator used with strings or sequences, it will combine them:

# Example 1
>> greeting = "Hi, "
>> name = "Andrei"
>> message = greeting + name
>> print(message)
Hi, Andrei

# Example 2
>> list_1 = [0, 1]
>> list_2 = [2, 3]
>> result = list_1 + list_2
>> print(result)
[0, 1, 2, 3]

Interpreter output at Cloud9 IDE:

23. Operators in Python - String concatenation operator

Multiple concatenation ( * )

The multiple concatenation operator returns a sequence self-concatenated specified amount of times.

# Example 1
>> message = '-' * 10
>> print(message)
----------

# Example 2
>> my_list = ['x', 'y', 'z']
>> result = my_list * 2
>> print(result)
['x', 'y', 'z', 'x', 'y', 'z']

Interpreter output at Cloud9 IDE:

24. Operators in Python - String multiple concatenation operator

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