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Answer. Yes, an else clause can be used with an if in a list comprehension. The following code example shows the use of an else in a simple list comprehension.
Using Assignment Expressions in List Comprehensions. We can also use assignment expressions in list comprehensions. List comprehensions allow you to build lists succinctly by iterating over a sequence and potentially adding elements to the list that satisfy some condition.
A list comprehension is a syntactic construct available in some programming languages for creating a list based on existing lists. It follows the form of the mathematical set-builder notation (set comprehension) as distinct from the use of map and filter functions.
Return is a statement. List comprehensions cannot contain statements, only expressions. In fact, that's true for all expressions in Python: they can only contain other expressions. So, no, you can't put a return inside a list comprehension.
List comprehension is an elegant way to define and create lists based on existing lists. List comprehension is generally more compact and faster than normal functions and loops for creating list. However, we should avoid writing very long list comprehensions in one line to ensure that code is user-friendly.