Module 3 - Operators and Expressions

In Python, arithmetic operatorsUsed to perform operations on variables and values in Python. Categories: Arithmetic, Assignment, Comparison, Logical, Identity, Membership. are used to perform mathematical operations on numbers. There are six arithmetic operatorsUsed to perform operations on variables and values in Python. Categories: Arithmetic, Assignment, Comparison, Logical, Identity, Membership. in Python:

• AdditionArithmetic operator that adds two numbers together. (+): Adds two numbers together.

# AdditionArithmetic operator that adds two numbers together.
x = 1 + 2
print(x)
# Output: 3

• SubtractionArithmetic operator that subtracts one number from another. (-): Subtracts one number from another.

# SubtractionArithmetic operator that subtracts one number from another.
y = 5 - 3
print(y)
# Output: 2

• MultiplicationArithmetic operator that multiplies two numbers together. (*): Multiplies two numbers together.

# MultiplicationArithmetic operator that multiplies two numbers together.
z = 2 * 3
print(z)
# Output: 6

• DivisionArithmetic operator that divides one number by another. (/): Divides one number by another.

# DivisionArithmetic operator that divides one number by another.
a = 10 / 2
print(a)
# Output: 5.0

• ModulusArithmetic operator that gives the remainder of dividing one number by another. (%): Gives the remainder of dividing one number by another.

# ModulusArithmetic operator that gives the remainder of dividing one number by another.
b = 10 % 3
print(b)
# Output: 1

• Floor DivisionArithmetic operator that divides one number by another. (//): Divides one number by another, dropping the remainder.

# Floor DivisionArithmetic operator that divides one number by another.
a = 11 // 2
print(a)
# Output: 5.0

• ExponentiationArithmetic operator that performs exponential calculation, raising one number to the power of another. (**): Performs exponential calculation, i.e. raising one number to the power of another.

# ExponentiationArithmetic operator that performs exponential calculation, raising one number to the power of another.
c = 2 ** 3
print(c)
# Output: 8

Arithmetic operatorsUsed to perform operations on variables and values in Python. Categories: Arithmetic, Assignment, Comparison, Logical, Identity, Membership. follow a specific order of precedenceThe specific order in which arithmetic operators are evaluated in an expression., which determines which operations are performed first. The order of precedenceThe specific order in which arithmetic operators are evaluated in an expression. is as follows:

1. ExponentiationArithmetic operator that performs exponential calculation, raising one number to the power of another.
2. MultiplicationArithmetic operator that multiplies two numbers together. and divisionArithmetic operator that divides one number by another.
3. AdditionArithmetic operator that adds two numbers together. and subtractionArithmetic operator that subtracts one number from another.

If there are multiple operatorsUsed to perform operations on variables and values in Python. Categories: Arithmetic, Assignment, Comparison, Logical, Identity, Membership. of the same precedence in an expression, they are evaluated from left to right.

Here is an example of how the order of precedenceThe specific order in which arithmetic operators are evaluated in an expression. affects the evaluation of an expression:

x = 2 * 3 + 4

In this expression, the multiplicationArithmetic operator that multiplies two numbers together. operator has a higher precedence than the additionArithmetic operator that adds two numbers together. operator. Therefore, the multiplicationArithmetic operator that multiplies two numbers together. is performed first, followed by the additionArithmetic operator that adds two numbers together.. The expression is evaluated as follows:

(2 * 3) + 4  
= 6 + 4  
= 10  
 

In Python, an expression is a combination of values, variables, operatorsUsed to perform operations on variables and values in Python. Categories: Arithmetic, Assignment, Comparison, Logical, Identity, Membership., and functions that evaluates to a single value. Expressions are used to perform calculations, manipulate data, and control the flow of execution.

There are many different types of expressions in Python, including:

• Arithmetic expressions: These expressions perform mathematical operations on numbers. For example, the expression 2 + 2 evaluates to the value 4.
• Boolean expressionsExpressions that evaluate to either True or False.: These expressions evaluate to either True or False. For example, the expression 1 < 2 evaluates to True, and the expression 1 > 2 evaluates to False.
• Comparison expressionsExpressions that compare two values and evaluate to either True or False.: These expressions compare two values and evaluate to either True or False. For example, the expression 1 == 2 evaluates to False, and the expression 1 != 2 evaluates to True.
• Logical expressionsExpressions that combine Boolean expressions using logical operators such as AND, OR, and NOT.: These expressions combine Boolean expressionsExpressions that evaluate to either True or False. using logical operatorsUsed to perform operations on variables and values in Python. Categories: Arithmetic, Assignment, Comparison, Logical, Identity, Membership. such as AND, OR, and NOT. For example, the expression (1 < 2) and (2 < 3) evaluates to True.
• String expressionsExpressions that combine strings using string operators such as concatenation and repetition.: These expressions combine strings using string operatorsUsed to perform operations on variables and values in Python. Categories: Arithmetic, Assignment, Comparison, Logical, Identity, Membership. such as concatenation and repetition. For example, the expression "Hello " + "World" evaluates to the string "Hello World".

Expressions can be used in a variety of ways in Python. For example, they can be used to:

1. Calculate the value of a variable.
2. Compare two values.
3. Control the flow of execution.
4. Create strings.
5. Call functions.