Reputation: 0 #1. So, when PEP 308 was approved, Python finally received its own shortcut conditional expression: It first evaluates the condition; if it returns True, expression1 will be evaluated to give the result, otherwise expression2. Let’s say we have a simple if-else condition like this: x = 10 if x > 0: is_positive = True else: is_positive = False We can use Python ternary operation to move the complete if-else block in a single line. One of the biggest bottlenecks that you will run into when learning Python is learning how professionals go through the process of coding. Last Updated: Wednesday 31 st December 2014. Python does not have a ternary operator. Most of the time, this is fine and dandy, but sometimes you just don’t want to take up the multiple lines required to write out the full for loop for some simple thing. You can put the 3rd line on the same line as the 2nd line, but even though this is now technically "one line" below the first colon, you can't put this new line on the same line as the first line. To condense if/else into one line in Python an example of Python's way of doing "ternary" expressions:-i = 5 if a > 7 else 0. Python shell responds somewhat differently when you type control statements inside it. Python One-Liners will teach you how to read and write “one-liners”: concise statements of useful functionality packed into a single line of code. All programing languages have some mechanism for variable declaration but one thing that stays common in all is the name and the data to be assigned to it. And all other ways to solve this problem with python is not obey the meaning of using python. You'll learn how to systematically unpack and understand any line of Python code, and write eloquent, powerfully compressed Python like an expert. The most common usage is to make a terse simple conditional assignment statement. This means that you will run an iteration, then another iteration inside that iteration.Let’s say you have nine TV show titles put into three categories: comedies, cartoons, dramas. Python One-Liner →List Comprehension. It has a trailing newline ("\n") at the end of the string returned. – Gareth Latty Jan 2 '14 at 18:01 Assigning multiple variables in one line in Python. Joined: Dec 2019. This is not the case with control statements, Python interpreter will automatically put you in multi-line mode as soon as you hit enter followed by an if clause. b : c In this post: Ternary operator in Python Misleading ternary operator Performance test Check your code It’s most often used for avoiding a few lines of code and a temporary variable for simple decisions. That tool is known as a list comprehension. Only the latter form of a suite can contain nested compound statements; the following is illegal, mostly because it wouldn’t be clear to which if clause a following else clause would belong: Sandeep More. It's also worth noting that there isn't a 'one line if-elif-else' statement in Python. In this sample script we collect an integer value from end user and store it in "b". Python does, however, allow the use of the line continuation character (\) to denote that the line should continue. Given above is the mechanism for assigning just variables in Python but it is possible to assign multiple variables at the same time. This is an alternative that you can use in your code. Conditional imports are somewhat common in code that supports multiple platforms, or code that supports additional functionality when some extra bonus modules are available. Share a link to this answer. For simple cases like this, I find it very nice to be able to express that logic in one line instead of four. 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