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Python example: list comprehensions

Last modified: April 2, 2021

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FAQ

What is a list comprehension in Python?

A list comprehension is a concise way to create lists in Python by specifying the elements to include and the conditions that they should meet.

What is the syntax for a list comprehension?

The syntax for a list comprehension is [expression for item in iterable if condition]. The expression specifies what to include in the list, the item is a variable that takes on each value in the iterable, and the condition is an optional filter for the items to include.

What is an iterable in Python?

An iterable is any object in Python that can be looped over, such as a list, tuple, or string. It can also be a generator or any other object that has an __iter__ method.

What is a generator expression in Python?

A generator expression is similar to a list comprehension, but it creates a generator object instead of a list. This can be useful for creating large sequences that you don't want to store in memory all at once.

Can you use a list comprehension to create a list of tuples?

Yes, you can use a list comprehension to create a list of tuples by including multiple expressions separated by commas in the expression part of the comprehension. For example: [(x, x**2) for x in range(5)].

What happens if you omit the if condition in a list comprehension?

If you omit the if condition in a list comprehension, all elements in the iterable will be included in the list.

What are some best practices for using list comprehensions in Python?

Some best practices for using list comprehensions in Python include: keeping them simple and readable, using meaningful variable names, avoiding excessively long expressions, and breaking them up into multiple lines if necessary.

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