Conditional expressions in Python are also known as ternary operators. They allow you to simplify and shorten your code when you need to evaluate a condition and assign a value based on that condition.

The syntax for a conditional expression in Python is as follows:

`value_if_true if condition else value_if_false`

The condition is a boolean expression that evaluates to either True or False. If the condition is True, the value before the “if” keyword is returned. If the condition is False, the value after the “else” keyword is returned.

For example, let’s say you have a variable called “temperature” and you want to print a message depending on its value:

temperature = 25

if temperature > 30:
message = “It’s too hot outside!”
else:
message = “It’s a nice day.”

print(message)

This code can be simplified using a conditional expression:

temperature = 25
message = “It’s too hot outside!” if temperature > 30 else “It’s a nice day.”
print(message)

Notice that the code is now shorter and easier to read.

You can also chain conditional expressions together to make more complex evaluations. For example:

x = 10
y = -5

result = “x is positive and y is negative” if x > 0 and y < 0 else “x is either negative or y is positive”
print(result)

In this case, the condition evaluates whether x is positive and y is negative. If this condition is True, the first message is returned. Otherwise, the second message is returned.