# Nested Conditionals | BUS 104 – Python Exam

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## Nested conditionals explained

In order to learn what nested conditionals actually are, check out this template code:

if condition:
if condition:
code to be executed if condition is true

Notice how another if statement occurs within a different if statement?

if condition:
if condition:
code to be executed if condition is true

That's the nested conditional. It's nested within another if statement.

Nested conditionals are conditional(s) that occur within the code to be executed of another conditional statement.

## Coding a nested conditional

Check out this Python program that determines if someone can legally drink:

if age > 21:
print("You can drink legally.")
elif age > 18:
if location == "Europe":
print("You can drink legally.")
elif location == "US":
print("You cannot drink legally.")

There's 3 potential situations here.

1) The user is above 21 years old...

if age > 21:
print("You can drink legally.")
elif age > 18:
if location == "Europe":
print("You can drink legally.")
elif location == "US":
print("You cannot drink legally.")

...and can drink legally.

if age > 21:
print("You can drink legally.")
elif age > 18:
if location == "Europe":
print("You can drink legally.")
elif location == "US":
print("You cannot drink legally.")

2) The user is above 18 years old...

if age > 21:
print("You can drink legally.")
elif age > 18:
if location == "Europe":
print("You can drink legally.")
elif location == "US":
print("You cannot drink legally.")

...and in Europe, so they can drink legally.

if age > 21:
print("You can drink legally.")
elif age > 18:
if location == "Europe":
print("You can drink legally.")
elif location == "US":
print("You cannot drink legally.")

3) The user is above 18 years old...

if age > 21:
print("You can drink legally.")
elif age > 18:
if location == "Europe":
print("You can drink legally.")
elif location == "US":
print("You cannot drink legally.")

...and in the US, so they cannot drink legally.

if age > 21:
print("You can drink legally.")
elif age > 18:
if location == "Europe":
print("You can drink legally.")
elif location == "US":
print("You cannot drink legally.")

Notice how in situations #2 and #3, we enter the same else if statement...

if age > 21:
print("You can drink legally.")
elif age > 18:
if location == "Europe":
print("You can drink legally.")
elif location == "US":
print("You cannot drink legally.")

...verifying the user is above age 18? This is the power of nested conditionals.

Nested conditionals enable you to go a step further in determining the desired output for a user.

One last nugget of gold before moving on. If you ever find yourself confused in a nested conditional block...

Pro tip: Focus on one block at a time.

I know it sounds obvious, but you'd be surprised how easy it is to see a massive conditional block and get too overwhelmed to even begin understanding what's going on.

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