Python 3 Conditional Statements: If, If Else and Nested If Statements

Conditional statements in Python are used to perform different actions based on different conditions. The three main types of conditional statements in Python are if statements, if-else statements, and nested if statements.

1. If Statement:
The if statement is used to execute a block of code if a certain condition is true. It follows the syntax:

“`
if condition:
# code to execute if condition is true
“`

Here’s an example:

“`python
x = 5

if x > 0:
print(“x is positive”)
“`

In this example, the code inside the if statement will only be executed if the condition `x > 0` is true.

2. If-Else Statement:
The if-else statement is used to execute a block of code if the condition is true and another block of code if the condition is false. It follows the syntax:

“`
if condition:
# code to execute if condition is true
else:
# code to execute if condition is false
“`

Here’s an example:

“`python
x = 5

if x > 0:
print(“x is positive”)
else:
print(“x is not positive”)
“`

In this example, if the condition `x > 0` is true, the code inside the if block will be executed. Otherwise, the code inside the else block will be executed.

3. Nested If Statements:
Nested if statements are if statements that are placed inside another if statement. They are used to perform more complex conditional operations. Here’s an example:

“`python
x = 5

if x > 0:
if x % 2 == 0:
print(“x is a positive even number”)
else:
print(“x is a positive odd number”)
else:
print(“x is not positive”)
“`

In this example, the outer if statement checks if `x` is positive. If it is, the inner if statement checks if `x` is even or odd.

These conditional statements are fundamental in Python programming and can be used to control the flow of your code based on different conditions.

The three main types of conditional statements in Python are:

1. If Statements: The if statement is used to execute a block of code if a certain condition is true.

2. If-Else Statements: The if-else statement is used to execute a block of code if a condition is true and another block of code if the condition is false.

3. Nested If Statements: Nested if statements are if statements that are placed inside another if statement. They are used to perform more complex conditional operations.

Certainly! Here’s a more detailed explanation of each type of conditional statement in Python:

1. If Statements:
The if statement is used to execute a block of code if a certain condition is true. It follows the syntax:
“`python
if condition:
# code to execute if condition is true
“`
The condition can be any expression that evaluates to either `True` or `False`. If the condition is `True`, the code inside the if statement block will be executed. If the condition is `False`, the code inside the if statement block will be skipped.

2. If-Else Statements:
The if-else statement is used to execute a block of code if the condition is true and another block of code if the condition is false. It follows the syntax:
“`python
if condition:
# code to execute if condition is true
else:
# code to execute if condition is false
“`
Similar to the if statement, the condition is evaluated. If the condition is `True`, the code inside the if block will be executed. If the condition is `False`, the code inside the else block will be executed.

3. Nested If Statements:
Nested if statements are if statements that are placed inside another if statement. They are used to perform more complex conditional operations. The syntax is as follows:
“`python
if condition1:
# code to execute if condition1 is true
if condition2:
# code to execute if condition2 is true
else:
# code to execute if condition2 is false
else:
# code to execute if condition1 is false
“`
In nested if statements, the inner if statement is evaluated only if the outer if statement’s condition is `True`. This allows for more specific conditions to be checked within the context of a broader condition.

These conditional statements are powerful tools in Python that allow you to control the flow of your program based on different conditions. They are commonly used for decision-making, branching, and executing different code paths depending on the values of variables or user input.

In conclusion, conditional statements are an essential part of programming in Python. They allow you to control the flow of your program based on different conditions. The three main types of conditional statements in Python are if statements, if-else statements, and nested if statements.

If statements are used to execute a block of code if a certain condition is true. If-else statements are used to execute one block of code if the condition is true and another block of code if the condition is false. Nested if statements are if statements placed inside another if statement, allowing for more complex conditional operations.

By using these conditional statements effectively, you can make your programs more dynamic and responsive to different situations. They are powerful tools for decision-making and branching, enabling you to execute different code paths based on the values of variables or user input. Mastering conditional statements is crucial for writing efficient and logical Python code.