Python inline function if

Inline If in Python: The Ternary Operator in Python

In this tutorial, you’ll learn how to create inline if statements in Python. This is often known as the Python ternary operator, which allows you to execute conditional if statements in a single line, allowing statements to take up less space and often be written in my easy-to-understand syntax! Let’s take a look at what you’ll learn.

The Quick Answer: Use the Python Ternary Operator

What is the Python Ternary Operator?

A ternary operator is an inline statement that evaluates a condition and returns one of two outputs. It’s an operator that’s often used in many programming languages, including Python, as well as math. The Python ternary operator has been around since Python 2.5, despite being delayed multiple times.

The syntax of the Python ternary operator is a little different than that of other languages. Let’s take a look at what it looks like:

Now let’s take a look at how you can actually write an inline if statement in Python.

How Do you Write an Inline If Statement in Python?

Before we dive into writing an inline if statement in Python, let’s take a look at how if statements actually work in Python. With an if statement you must include an if , but you can also choose to include an else statement, as well as one more of else-ifs, which in Python are written as elif .

The traditional Python if statement looks like this:

x = True if x is True: y=10 else: y=20 print(y) # Returns 10

This can be a little cumbersome to write, especially if you conditions are very simple. Because of this, inline if statements in Python can be really helpful to help you write your code faster.

Let’s take a look at how we can accomplish this in Python:

x = True y = 10 if x else 20 print(y) # Returns 10

This is significantly easier to write. Let’s break this down a little bit:

• We assign a value to x , which will be evaluated
• We declare a variable, y , which we assign to the value of 10, if x is True. Otherwise, we assign it a value of 20.

We can see how this is written out in a much more plain language than a for-loop that may require multiple lines, thereby wasting space.

Tip! This is quite similar to how you’d written a list comprehension. If you want to learn more about Python List Comprehensions, check out my in-depth tutorial here. If you want to learn more about Python for-loops, check out my in-depth guide here.

Now that you know how to write a basic inline if statement in Python, let’s see how you can simplify it even further by omitting the else statement.

How To Write an Inline If Statement Without an Else Statement

Now that you know how to write an inline if statement in Python with an else clause, let’s take a look at how we can do this in Python.

Before we do this, let’s see how we can do this with a traditional if statement in Python

x = True if x is True: y=10 print(y) # Returns 10

You can see that this still requires you to write two lines. But we know better – we can easily cut this down to a single line. Let’s get started!

x = True if x: y = 10 print(y) # Returns 10

We can see here that really what this accomplishes is remove the line break between the if line and the code it executes.

Now let’s take a look at how we can even include an elif clause in our inline if statements in Python!

How to Write an Inline If Statement With an Elif Statement

Including an else-if, or elif , in your Python inline if statement is a little less intuitive. But it’s definitely doable! So let’s get started. Let’s imagine we want to write this if-statement:

x = 3 if x == 1: y = 10 elif x == 2: y = 20 else: y = 30 print(y) # Returns 30

Let’s see how we can easily turn this into an inline if statement in Python:

x = 3 y = 10 if x == 1 else (20 if x == 20 else 30) print(y) # Returns 10

This is a bit different than what we’ve seen so far, so let’s break it down a bit:

• First, we evaluate is x == 1. If that’s true, the conditions end and y = 10.
• Otherwise, we create another condition in brackets
• First we check if x == 20, and if that’s true, then y = 20. Note that we did not repeated y= here.
• Finally, if neither of the other decisions are true, we assign 30 to y

This is definitely a bit more complex to read, so you may be better off creating a traditional if statement.

Conclusion

In this post, you learned how to create inline if statement in Python! You learned about the Python ternary operator and how it works. You also learned how to create inline if statements with else statements, without else statements, as well as with else if statements.

To learn more about Python ternary operators, check out the official documentation here.

Источник

Python Inline If-else

Python is the programming language that is efficient and readable while writing operators. It has multiple operators which are used to perform different tasks, such as comparing and combining two different strings, and integer values, or checking any provided condition. Moreover, Python doesn’t have a ternary operator. Therefore, the “inline if-else” condition can be used for checking multiple conditions at once in a single line.

In this post, we will discuss the usage of the inline if-else in Python.

What is Inline If-Else in Python?

In Python, an inline if-else statement is a logical statement that offers a compact version of the “if-else” condition in a single line. It preserves the code quality by replacing the number of lines of “if-else” code. Additionally, an inline statement is restricted and includes several “if-else”, if they are carefully cascaded. It must include the else clauses, otherwise, it won’t give results. Moreover, the “inline if-else” statement can be used while assigning values or other functions to increase the code readability and makes it more concise.

Here is the syntax of the “inline if-else” statement:

In the above-given code block:

• “ ” expression is executed if the provided condition becomes true.
• second_expr> expression is executed if the provided condition is not satisfied.
• Both conditions are executed from the left to right side.

How to Use Inline If-Else in Python?

To better understand the working of the inline if-else statement, let’s have a look at the below provided multiple examples.

Example 1: Using Inline If-Else Statement With Boolean Values

In this example, we will check the color of the fruit “mango” by utilizing the “inline if-else” statement. First, declare a string variable and initialize with the “green”:

Next, the “n” variable is specified with an “if-else” condition that returned “Yes” if the string variable has the “yellow”, else it will return “No”

Now, call the “print()” function and pass the “n” variable that holds the conditions checking result:

According to the below-given output, the specified condition has not satisfied and returned “No”:

Example 2: Using Inline If-Else With Integer Values

Let’s take one more example, create “m” variable and initialize with the integer value “20”:

We have declared “n” variable that is equal to “1”, and check the specified condition:

Use the “print()” function to get the filtered result:

That’s all about the usage of the if-else condition in Python.

Conclusion

The inline if-else statement is a logical statement that offers a compact version of the “if-else” condition in a single line. It preserves the code quality by replacing the number of lines of “if-else” code. In Python, there is no ternary operator., therefore the “if-else” can be used in a single line that has the same effects as ternary operators. This post illustrated about the usage of the inline if-else in Python.

About the author

Maria Naz

I hold a master’s degree in computer science. I am passionate about my work, exploring new technologies, learning programming languages, and I love to share my knowledge with the world.

Источник

Python Inline If | Different ways of using Inline if in Python

While doing programming, the coder needs to do concise and clean code. As a result, they prefer choosing the concise version of big statements. Inline if is a concise version of if…else statement can be written in just one line. It basically contains two statements and executes either of them based on the condition provided. So, let us see the various ways in which one can use inline if in python.

Ways to use Python inline if statement:

Python Inline if Without else:

Syntax:

Parameters:

Example: Python Inline if without else

con = True if con:print('The condition is True')

Explanation:

Here, the con consists of the Boolean value True. As a result, the condition is satisfied, and the statement print (‘The condition is True’) is executed.

Python Inline if with else statement:

Syntax:

Parameters:

• : executed if the condition evaluation is true
• : the condition that will determine which statement to follow
• : executed if the condition evaluation is false

Example: Python Inline if with else

color='blue' print ("The color is red" if color == 'red' else "The color is not red")

Output:

Explanation:

The value of color is ‘blue’. As a result, the condition doesn’t satisfy and so the statement in else part is executed.

Python Inline if with elif:

Although it can look a bit messy, writing an inline if- elif statement is possible and can be used as an expression wherever necessary.

Example: Python Inline if with elif

value = 10 print ("The value is less than 10" if value10 else "The value is equal to 10"))

Explanation:

It will first compare and check the value of 10, whether or not it is lesser than 10. As it is false, it goes into the next statement and checks if the value is more than 10. And ultimately, since none of the condition satisfies, it executes the last else part and prints the statement The value is equal to 10

Advantages of Python Inline if:

By now, we have understood how to use an inline if statement in different forms. But if we want to implement it into our program, we should know about its advantage and its disadvantage.

Since it itself is an expression, it can be used inside other expressions as well. It can be used as an expression inside a list, lambda functions, etc.

Example:

Output:

Explanation:

In this example, we have used the inline if expression as an expression for the list. It checks that if the element is less than 50, it will add it to the list. Otherwise, it will subtract 50 from the number and then add it to the list.

Disadvantage of Python Inline if:

Being an expression, it definitely serves various purposes. However, it is also the cause of disadvantage for the inline if. Since it is an expression, one can’t use any statement inside it.

Example:

Output:

Explanation:

Syntax Error is that in the else part, a=a+1 is a statement, and since inline if it is an expression, one cannot write a statement inside it.

Conclusion:

So, these are the various ways in which the inline if statement can be used. Since it is an expression, it comprises of both advantages and disadvantages. The usage of inline if should be done according to the program’s requirement to deliver the most optimized and accurate result.

However, if you have any doubts or questions, do let me know in the comment section below. I will try to help you as soon as possible.

Happy Pythoning!

Источник