![]() Print("Elapsed time: " + str(stop - start)) How fast is the + operator really? Here’s a common scenario how people use it to add new elements to a list in a loop. This can be very inefficient if you use the + operator multiple times in a loop. ![]() The problem with the + operator for list concatenation is that it creates a new list for each list concatenation operation. But if you use the + operator on two lists, you’ll get a new list that is the concatenation of those lists. List concatenation operator +: If you use the + operator on two integers, you’ll get the sum of those integers. In other words, element i will move to position i+1. Note that if you insert an element at the first position, each subsequent element will be moved by one position. This way, you can insert an element to each position in the list-even at the first position. The insert(i, x) method inserts an element x at position i in the list. But if you insist, you can use the insert() method instead. Well, you should work on your terminology for starters. What if you want to use the extend() method at the beginning: you want to “add” a number of elements just before the first element of the list. Instant PDF Download Python List extend() At The Beginning Click the image to download the high-resolution PDF file, print it, and post it to your office wall: Here’s your free PDF cheat sheet showing you all Python list methods on one simple page. ![]() Why? Because the integer argument isn’t an iterable-it doesn’t make sense to “iterate over all values in an integer”. But what it doesn’t allow is an integer argument. ![]() You can see that the extend() method allows for all sorts of iterables: lists, sets, tuples, and even range objects. Let’s dive into a few more examples: > lst = You can check out the solution on the Finxter app. # What's the output of this code snippet? Let’s deepen your understanding with a short code puzzle-can you solve it? # Puzzle ![]()
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