![]() In addition to a list comprehension, Python also offers a dictionary and a set comprehension functionality. Let's modify the comprehension above to generate even numbers from odd ones: multipleEvenFromOdds = But a list comprehension is useful when you need to perform several iterations and place each of them in separate variables.įor instance, you can perform another operation on n and have a dedicated variable for it. It consists of square brackets containing an expression followed by a for clause, then zero. ![]() List comprehension is a pythonic way of expressing a for loop that appends to a list in a single line of code. List comprehensions provide a short and concise way to create lists. Python List comprehension provides a much more short syntax for creating a new list based on the values of an existing list. You can still write the code above in a single function without using comprehension. Introduction to List comprehension in Python. A Python list comprehension consists of brackets containing the expression, which is executed for each element along with the for loop to iterate over each element in the Python list. Let's insert a multiplier function that gets even numbers in a list comprehension to see how this works: Numbers = WordCounter = Ī list comprehension can also accept a function that performs a specific operation. Let's have a look at a word counter comprehension below: word = List comprehension is an easy to read, compact, and elegant way of creating a list from any existing iterable object. You can manipulate strings with Python list comprehension as well. List comprehension is a complete substitute to for loops, lambda function as well as the functions map(), filter() and reduce(). ![]() You can also have a plain nested for loop in a list comprehension: someNums = It also takes a nested for loop: someNums = for _ in range( 4)] Now, let's also rewrite the code above using an open for loop: myList = Ī list comprehension also accepts nested if statements: oddNumbers =
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