What are the conditional statements in Python?

Carol 48 Published: 09/11/2024

What are the conditional statements in Python?

I'm happy to help you with that!

Conditional statements in Python are used to execute different blocks of code based on certain conditions. There are several types of conditional statements in Python, including:

If Statement: The most basic form of a conditional statement is the if statement. It takes the following format:

if condition:

do something

The condition can be any valid Python expression that evaluates to either True or False. If the condition is True, the code inside the indented block will be executed. If it's False, the code won't run.

For example:

x = 5

if x > 10:

print("x is greater than 10")

print("This line always runs")

When you run this code, the output will be "This line always runs" because x is not greater than 10.

Else Statement: Sometimes, you want to execute a different block of code if the condition is False. This is where the else statement comes in:
if condition:

do something

else:

do something else

For example:

x = 5

if x > 10:

print("x is greater than 10")

else:

print("x is less than or equal to 10")

print("This line always runs")

When you run this code, the output will be "x is less than or equal to 10" because x is not greater than 10.

Elif Statement: If you have multiple conditions that you want to check in a specific order, you can use the elif statement:
if condition1:

do something

elif condition2:

do something else

else:

do something else if all others are false

For example:

x = 5

if x > 10:

print("x is greater than 10")

elif x == 5:

print("x is equal to 5")

else:

print("x is less than 5")

print("This line always runs")

When you run this code, the output will be "x is equal to 5" because x is indeed equal to 5.

Nested Conditional Statements: You can also nest conditional statements inside each other:
if condition1:

if condition2:

do something

else:

do something else

else:

do something else

For example:

x = 5

y = 10

if x > 10:

if y > 15:

print("x and y are both greater than 10")

elif y == 10:

print("x is greater than 10, but y is equal to 10")

else:

print("x is greater than 10, but y is less than 10")

else:

if y > 15:

print("y is greater than 10, but x is not")

elif y == 10:

print("y is equal to 10, and x is not")

else:

print("neither x nor y are greater than 10")

When you run this code, the output will depend on the values of x and y.

Ternary Operator: Finally, there's a shorthand way to write if-else statements using the ternary operator (a if condition else b). It takes the following format:
result = value if condition else other_value

For example:

x = 5

y = "greater than 10" if x > 10 else "less than or equal to 10"

print(y)

When you run this code, the output will be "less than or equal to 10" because x is not greater than 10.

I hope that helps!

Is else a conditional statement in python with example

I'd be happy to help you with that!

The else statement is actually part of the syntax for Python's control structures, specifically the if-else statement and the try-except block.

Let's start with the if-else statement. The basic syntax for this statement is:

if condition:

code to execute if condition is true

else:

code to execute if condition is false

Here's an example:

x = 5

y = 3

if x > y:

print("x is greater than y")

else:

print("x is less than or equal to y")

Output: x is less than or equal to y

In this case, the condition x > y is false, so the code inside the else block gets executed.

Now let's look at the try-except block. The basic syntax for this block is:

try:
code that might raise an exception

except ExceptionType:

code to execute if an exception of type ExceptionType is raised

else:

code to execute if no exceptions are raised

Here's an example:

def divide(a, b):

try:

result = a / b

except ZeroDivisionError:

print("Cannot divide by zero!")

else:

print(f"{a} divided by {b} is {result}")

divide(10, 2) # Output: 10 divided by 2 is 5.0

divide(10, 0) # Output: Cannot divide by zero!

In this case, the code inside the try block raises a ZeroDivisionError when dividing by zero. The except block catches this exception and prints an error message. If no exceptions are raised (like in the first call to the function), the code inside the else block gets executed.

Some important things to note:

The else statement is only executed if the code inside the try block doesn't raise any exceptions. The except statement can have multiple clauses, like this: except (ExceptionType1, ExceptionType2):. You can also specify a variable in the except clause to catch and store the exception instance.

In summary, Python's else statement is used with control structures like if-else or try-except to execute code based on conditions.