There are several ways to create a new list based on the elements of some other collection, but the use of a list comprehension has multiple benefits. First, it is both concise and readable, and second, it yields a fully-formed object without requiring a mutable object as input that must be updated multiple times in the course of the list creation.

== Noncompliant Code Example

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squares = []
for x in range(10):
   squares.append(x**2)  # Noncompliant

squares = map(lambda x: x**2, range(10))  #Noncompliant
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== Compliant Solution

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squares = [x**2 for x in range(10)]
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