How to return elements from a list that have a certain length?

Question

I\'m trying to return words that have a specific length size.

The words is a list and size is a positive integer here. The result should be

Answer 1

def by_size(words,size):
    result = []
    for word in words:
        if len(word)==size:
            result.append(word)
    return result

Now call the function like below

desired_result = by_size(['a','bb','ccc','dd'],2)

where desired_result will be ['bb', 'dd']