Method #3 : Using list comprehension. List comprehension is generally more compact and faster than normal functions and loops for creating list. In short, one of the best ways to sum elements of two lists in Python is to use a list comprehension in conjunction with the addition operator. List comprehension is an elegant way to define and create lists based on existing lists. Python Language Iterate two or more list simultaneously within list comprehension Example For iterating more than two lists simultaneously within list comprehension , one may use zip() as: Method #1 : Using list comprehension + zip() List comprehension does the task of concatenating the similar index elements. We can use the above example to create a dictionary from two lists. The minimal syntax for dictionary comprehension is the following. Dictionary Comprehension. Python List Comprehension is a way of creating Python Lists. zip lets you iterate over the lists in a similar way, but only up to the number of elements of the smallest list. Following is the syntax of List Comprehension with two lists ⦠This time I want to sum elements of two lists in Python. In Python, the built-in function zip() aggregates the elements from multiple iterable objects (lists, tuples, etc.). 20, Feb 19. List Comprehension : IF-ELSE Here we are telling python to convert text of each item of list to uppercase letters ⦠filter(lambda x: x%2 == 0, range(1, 10**7)) returns even numbers from 1 through (10 raised to power 7) as filter() function is used to subset items from the list. Pythonâs zip() function creates an iterator that will aggregate elements from two or more iterables. Short answer: Per default, the zip() function returns a zip object of tuples. Python program to concatenate two Integer ⦠But if ⦠List Comprehension is more idiomatic and concise when compared to looping statements, in creating lists. The following syntax shows how to zip ⦠... How to Zip two lists of lists in Python? 20, Feb 19. Therefore, the output of the second technique is: Zip: a1 b1 a2 b2. Python 2.0 introduced list comprehensions, with a syntax that some found a bit strange: [(x,y) for x in a for y in b] This iterates over list b for every ⦠Dictionary comprehension is an elegant and concise way to create dictionaries. The task of zip function is concatenating the resultant string into a single list and return list. In this tutorial, we will learn how to use List Comprehension with Two Lists and create a new list. Roughly you can think of filter() as WHERE clause of SQL. Python List is an inbuilt data type that is an ordered and changeable collection, and it allows duplicate elements. Python program to concatenate two ⦠To merge the list in Python, use list comprehension. ... How to Zip two lists of lists in Python? I got the inspiration for this topic while trying to do just this at work the other day. In our case, we have to merge a list based on two lists. Merge Two Lists into One in Python ⦠List comprehension is an artistic pythonic way to create lists based on extant lists. dictionary = {key: value for vars in iterable} See the following code example of a dictionary comprehension. In this case, a new list is created, but this method is a one liner alternative to the loop method discussed above. The following syntax shows how to zip together two lists of equal length into one list: #define list a and list b a = ['a', 'b', 'c'] b = [1, 2, 3] #zip the two lists together into one list list(zip (a, b)) [('a', 1), ('b', 2), ('c', 3)] Example 2: Zip Two Lists of Equal Length into a Dictionary. 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