Here the iterable can be a list, tuple, string, etc. In the above example, we iterate through the series of tuples returned by zip() and unpack the elements into a and b. For Loop Over Python List Variable and Print All Elements To get only the items and not the square brackets. After creating the list we are using the for loop here to loop through each element of the list. In the above example first we have created an iterable (list) with elements [10, 20, 30, 40, 50, 60, 70]. In while loop way of iterating the list, we will follow a similar approach as we observed in our first way, i.e., for-loop method. 1. enumerate() function The pythonic solution to loop through the index of a list is using the built-in function enumerate(). In the above example 1 program the  np.arange(10) creates a sequence of integers from 0 to 9 and stores it in variable x. The fourth way in our list is iteration using the enumerate method. For loops iterate over collection based data So, the map() function will pass every element of n to the lambda y:y function and return the elements. Then, we create a function called grouper. Similar to list, range is a python type that allows us to iterate on integer values starting with the value start and going till end while stepping over step values at each time. Then you create a for loop over iterable with enumerate() and set start=1. The itertools.cycle() method returns an infinite iterator. So if you make it till the end, I am pretty sure you now be able to understand all the possible ways to iterate through the list in Python. The list of the length is 7, so now the value of the length variable is 7. Get the index of an item in Python List – 3 Easy Methods, Create an Empty List in Python – 2 Easy Ways, Check if a List is Empty – 3 Easy Methods, 1. In the above example program, we have first initialised and created a list with the name list itself. Python : Different ways to Iterate over a List in Reverse Order Python : How to add an element in list ? In this article we will discuss different ways to Iterate over a python list in reverse order. In this post, we will see how to loop through a list with index in Python. For performing operations on arrays, the need arises to iterate through it. Iterate Through List in Python Using zip()10. A list may also have a different list as a thing. Looping Over Multiple Iterables Looping over multiple iterables is one of the most common use cases for Python’s zip() function. Grouper is function which we can use to group the elements of list and iterate through them. Iterate Through List in Python Using Numpy Module, 4. In this method of iteration, we will use the list comprehension way. Iterate Through List in Python Using While Loop, 3. (Optional). Iterators are generally implemented within loops, comprehensions, generators, etc. Iterate Through List in Python Using Iter() and Next()9. Iterate Through List in Python Using Enumerate Method, 5. In the above example, we have used the combination of lambda and map function to iterate the list. Python List – Iterate over Elements To iterate over elements of a List there are many methods. We’ll configure this to repeat only one time. Here iter_obj can be any iterable object created by iter() function. It may have any number of things, and they might be of different types (integer, float, string, etc.). Iterate through list in Python with a while loop, 5. After that using a while loop to loop through the iterator and increment the count at every loop. Default is 0. Iterate Through List in Python Using While Loop3. The list contains seven elements in it. In the above example, we used a for loop to loop over num_list, which was a list of integers starting at 1 and ending at 5, or [1,2,3,4,5]. You have to use the Python for loop. We use a for loop to iterate over every grade in our list of grades to consider. Hello fellow programmers in today’s article we will learn how to iterate through the list in Python. In Python, the list is a type of container in Data Structures, which is used to store multiple data at the same time. Take inputs from user to make a list. The range() function returns a sequence of numerals, starting from 0 (default), and by default increment by 1, and stops before a specified number. Iterate over list using for loop. Basically in layman language, it converts the dimensions of the array-like in this example we have used the reshape() function to make out numpy array a 2D array. Iterate through list in Python using range() method, 2. As initially, the value of ‘i’ is ‘0’ and the length of the list is ‘6’. We then limit the number of times we loop through the iterator by using the count. When we reach the end, and there is no more data to be returned, it will raise the StopIteration exception. In Python the __iter__() and __next__() are collectively knows as iterator protocol. In this section, use itertools.zip_longest to create a grouper. Iterate Through List in Python Using While Loop The second method to iterate through the list in python is using the while loop. Iterate Through List in Python Using List Comprehension6. How to Get the First and Last Elements of a Python List? And finally, the iterable, in the above example, the iterable is the list. If yes there is an awesome tutorial available in our library of tutorials do check it out. We’ll iterate through this iterator to get individual elements from the list. Python’s range() method can be used in combination with a for loop to traverse and iterate over a list in Python. range is most commonly used for implementing a C-like for loop in Python. This function takes iterable as argument and number of elements to group together. Then we’ll split each line into two parts. In this example we will iterate a 2d array using numpy module. The list contains six elements in it which are [9, 11, 13, 15, 17, 19] respectively. First, values is initialized to be an empty list. If we use zip() function for multiple lists with different size, it will stop after running out of item of the shortest list. So I am assuming you already have basic knowledge of loops. Default is 1. A sequence of a list, collection, or an iterator object. Iterating a Python list using lambda function. Python enumerate() method to iterate a Python list, 7. Note: The range method doesn’t include the stop number in the resultant sequence. Python provides functions range () and xrange () to generate lists and iterators for such intervals, which work best for the most frequent case: half-open intervals increasing from zero. Doing iteration in a list using a for loop is the easiest and the most basic wat to achieve our goal. Iterate Through List in Python Using Enumerate Method5. We’ll iterate over our list so we can access each line of text from our file. Here in this way to iterate list we have used the enumerate method. even_items() takes one argument, called iterable, that should be some type of object that Python can loop over. Hope you understand what is a list and iteration in python. Strengthen your foundations with the Python Programming Foundation Course and learn the basics. We … After that we have finded the length of the list using the len function. Python NumPy to iterate through List in Python, 6. Itertools is a library that creates efficient iterators. print("**** Iterate over string with index using range () ****") Iterate Through List in Python Using Itertools Grouper, Understanding Priority Queue in Python with Implementation, Numpy Power | In-depth Explanation of np.power() With Examples, Numpy Hstack in Python For Different Arrays, Numpy Vstack in Python For Different Arrays, Matplotlib Arrow() Function With Examples, Numpy Convolve For Different Modes in Python, (Optional). The enumerate(list) function here will iterate through each element in the list and also print the number including the index of each element. Values are generated within the half-open interval [start, stop) (in other words, the interval including start but excluding stop). zip_longest is a method that aggregates the elements from each of the iterables. Unlike Sets, lists in Python are ordered and have a definite count. If you want to iterate through two lists simultaneously you can use the zip() method in Python. This cycle function returns the infinite iterator which repeats the list over and over again. Some of them are: using while loop, using for loop, etc. >>> Given below are a few methods to complete a given task. In the above example, we first imported itertools. For achieving our goal using this method we need two numpy methods which are mentioned below: The iterator object nditer provides many flexible ways to iterate through the entire list using the numpy module. To achieve our goal we need three functions here. After performing the statement it will move to the updation expression and follow the required step of incrementing by ‘1′. If you are new to the programming you might don’t know about the terms like iteration and lists. This corresponds with no value because our list contains multiple JSON objects. How to remove elements from a list in Python? 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