Enumerate in python

As the title suggests I wanted to enumerate the key and its values (without brackets) in python. I tried the following code : example_dict = [print(i,j,a) for (i,j,a) in enumerate(example_dict.items())] But it doesn't work. I want the output to be like this 0 left 2 up ^ 3 down v Thank you in advance As in Alexandre's comment, the code would work like this: for (i, (name, sym)) in enumerate(example_dict.items()): print(i, name, sym) A comment about style: while comprehension is really neat when computing values, using it for a loop of printing would work, but would obfuscate the intent of your code, making it less readable. You used a comprehension expression for printing: [print(i,j,a) for (i,j,a) in enumerate(example_dict.items())] There are two problems with this: 1) you a computing a list (possibly a big one) of None values (which are returned by print); 2) You hide what should be, and, in my code, evidently is, an output operation, inside an expression of a computation.

In this tutorial, you’ll learn how to use the Python enumerate function to improve your Python for loops. The Python enumerate() function allows you to loop over an iterable object, such as lists or dictionaries while accessing the item’s index position. The enumerate() function lets you write significantly cleaner Python for-loops. By the end of this tutorial, you’ll have learned: • What the Python enumerate() function is • Why the Python enumerate() function is useful • How to use the enumerate() function to loop over Python lists, tuples, strings, and dictionaries • How to start at a different index counter using the Python enumerate() function • How to use the Python enumerate() function in reverse Table of Contents • • • • • • • • • Understanding the Python enumerate() Function with a List The Python enumerate() function is an incredibly versatile function that allows you to access both the index and item of an iterable, while looping over an object. The best way to understand the usefulness of the function is to use it! Let’s take a look at an example of using the enumerate() function # Using the Python enumerate() Function websites = ['datagy', 'google', 'askjeeves'] for item in enumerate(websites): print(item) # Returns: # (0, 'datagy') # (1, 'google') # (2, 'askjeeves') We can see that the enumerate() function returns a tuple for each item in the item passed into it. The tuple is made up of the index of the item and the item itself. Because we can unpack these ite...

This tutorial will teach you how to use the enumerate() function in Python. The enumerate() function in Python provides a concise syntax to access the items in an iterable along with their indices. We’ll start by reviewing how to access items and indices using simple looping and then proceed to learn the syntax of Python’s enumerate() function. We’ll also code examples along the way. Let’s begin. How to Iterate Using for Loop in Python Any Python object that you can iterate over and access the individual items—one at a time is called an iterable. Therefore, Python lists, tuples, dictionaries, and strings are all iterables. Let’s take an example of a shopping list defined in the code cell below. shopping_list = ["fruits","cookies","cereals","protein bars","post-it notes"] In Python, you can use the for loop to loop through any iterable. The syntax to do this is as follows: for item in : # do something on item # item: looping variable # : any Python iterable: list, tuple, dictionary, string, and so on. Now, using this syntax, let’s loop through shopping_list and access the individual items. for item in shopping_list: print(item) # Output fruits cookies cereals protein bars post-it notes This construct helps you access the items directly. However, you may sometimes need to access the index of the items, in addition to the items themselves. You can use an index variable, which you can increment inside the loop body, as shown below: index = 0 for item in shopping_list: print(f"...

If you’re familiar with Python, you would have known Increment and Decrement operators ( both pre and post) are not allowed in it. Python is designed to be consistent and readable. One common error by a novice programmer in languages with ++ and — operators are mixing up the differences (both in precedence and in return value) between pre and post-increment/decrement operators. Simple increment and decrement operators aren’t needed as much as in other languages. For normal usage, instead of i++, if you are increasing the count, you can use i+=1 or i=i+1 In Python, instead, we write it like below and the syntax is as follow: for variable_name in range(start, stop, step) • start: Optional. An integer number specifying at which position to start. Default is 0 • stop: An integer number specifying at which position to end. • step: Optional. An integer number specifying the incrementation. Default is 1 Output INCREMENTED FOR LOOP 0 1 2 3 4 DECREMENTED FOR LOOP 4 3 2 1 0 Output-1: INCREMENTED FOR LOOP 0 1 2 3 4 Output-2: DECREMENTED FOR LOOP 4 3 2 1 0 This article is contributed by Basavaraja. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to [email protected]. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.