python reverse for loop range

We also have thousands of freeCodeCamp study groups around the world. If we have a section of code that we would like to repeat a certain number of times, we employ for loops. In this section, youll learn how to reverse Python lists using loops, recursion, and comprehensions. "pstat slipped through my filter when it was weak." To reverse a string without using reversed or [::-1] , try something like: def reverse(text): Still, it provides a quick way to iterate over a reversed copy of an existing list without the risk of being affected by changes in the original list. , get answers to common questions in our support portal, Create reversed copies of existing lists using, Creating reversed copies of an existing list. This special method returns an iterator over the items of the current list in reverse order. I'm not sure it would have been the design choice I'd have chosen, but it's basically to emphasise that a new object is not returned. How can I get a reversed copy of a list (avoid a separate statement when chaining a method after .reverse)? WebInside the outer loop, the 1st inner loop handles the number of spaces and the values change according to requirements. The loop is used next to replace range elements with The range goes from 5 (the start) up to 0 (the stop), but with a step of -1, meaning that the numbers decrease. If you wanted to store the return value from the reversed() function for later use, you'd instead have to enclose it inside the list() constructor and assign the new list to a variable, like so: And there you have it - you now know the basics of how reversing lists in Python works! It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Guido van Rossum (our Python BDFL) states the design choice on the Python-Dev mailing list: I'd like to explain once more why I'm so adamant that sort() shouldn't For this, we use the reversed() function in Python. Besides the above algorithm, which takes advantage of index substitution, there are a few different ways to reverse lists by hand. When you run this trick, you get a copy of the original list in reverse order without affecting the input data. The range() function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number. I'm dealing with a list of about 5e6 elements or so, so I really need to avoid copying the list. Does Python have a ternary conditional operator? because range(10, 0, -1) will stop at the index 0, as a result, the index 0 value will not print. The loop always includes start_value and excludes end_value during iteration: run. Should I include the MIT licence of a library which I use from a CDN? Sometimes you need to process Python lists starting from the last element down to the firstin other words, in reverse order. In this case, you can do something like this: Here, the loop iterates through a reversed copy of numbers. Here are some examples of the start, stop, and step parameters in action: As you can see, there are ways to define virtually any range of numbers you may want. basics Negative values can be passed as an increment in order to decrement the output. Example: Fig: range () function in Python for loop The program operates as follows. Another way to create a reverse loop in Python is to use the built-in range () function with a negative step value. For example range (5, 0, -1) will return a list of numbers from 5 to 1 in reverse order. Here, the range () function starts at 5 and ends at 1. The step value is -1. So, effectively it iterates over the sequence in reverse order. for i in xrange(len(numbers)): Making statements based on opinion; back them up with references or personal experience. For other methods, we can get modified copies like so: .clear -> there is no point to this; a "cleared copy" of the list is just an empty list. Heres how you can use .reverse(): When you call .reverse() on an existing list, the method reverses it in place. Another point to note is that you cant use reversed() with unordered iterables: In this example, when you try to use reversed() with a set object, you get a TypeError. This is because sets dont keep their items ordered, so Python doesnt know how to reverse them. Note: Most of the examples in this tutorial use a list of numbers as input. Pythons range () function makes it super easy to generate range objects. If you want to create a reversed copy of an existing list in Python, then you can use reversed(). Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm), Drift correction for sensor readings using a high-pass filter. To add a single element e wrap it in a list first: y = x + [e]. Were type hints (and so, "peeks" at signature definitions in IDEs) in widespread use at that time? You might want to use the reversed function in python. Theyre also expected to implement the .__iter__() special method to return the current iterator instance. Note: Compared to extended slicing, reversed() is way more readable, runs faster, and uses substantially less memory. Examples might be simplified to improve reading and learning. But for iteration, you should really be using xrange instead. Depending on your specific needs, you can use: In the following few sections, youll learn about all these options and how they can help you iterate over lists in reverse order. Let's take our very first example, where we used range (5). All of this knowledge helps you improve your list-related skills. But since were dealing with negative steps, we want to start at a number thats greater than the value where we will stop. y = z-x If the condition satisfies, then only print the number. It works this way on purpose, so that code like x.sort().reverse() breaks. All of these three solutions give the same results if the input is a string: To reverse a string without using reversed or [::-1], try something like: Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Find out how to reverse a range in Python and learn more about the range(), reversed(), and sorted() functions. Go ahead and uncomment the line to see what happens! Dealing with hard questions during a software developer interview. reverse () method reverse () is a list data type method that reverses the elements of the list in-place. Discover how to learn Python and improve your Python skills over time. This will help you write better Python code. WebTo loop through a set of code a specified number of times, we can use the range () function, The range () function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number. reversed += text[i] The range() function allows you to generate a list of numbers within a specified range. Find centralized, trusted content and collaborate around the technologies you use most. range() and xrange() take a third parameter that specifies a step. So you can do the following. range(10, 0, -1) In the future, please try to look for problems in the code yourself, by carefully studying what happens when the code runs. Try range(100,-1,-1) , the 3rd argument being the increment to use (documented here ). ("range" options, start, stop, step are documented here ) To my mind, returning a reference allows a different technique ("chaining") without preventing any other technique (sequential modifications), so it would only be "worse" if chaining itself is "bad". @hacksoi depends on the use case but let's say you're iterating backwards in a large buffer, let's say it's 10 MB, So by default generator objects haven't this like many others iterables. WebTo get the reversed range-based for loop, we have used boost library. Up to this point, youve learned how to create reversed lists and also how to reverse existing lists in place, either by using tools specially designed to accomplish that task or by using your own hand-coded solutions. Many people expect the start value to always be less than the stop. The step parameter is the number that determines how numbers will be incremented. If the name for loop confuses you, we recommend checking out our Learn Programming with Python track, which goes over and well beyond all of Pythons basic syntax. The signature of this built-in function is like this: This function works similarly to the indexing operator. .append and .extend -> probably the simplest way is to use the + operator. return 'self'. As we know list in python is a mutable object and one of characteristics of mutable object is the ability to modify the state of this object without the need to assign its new state to a variable. Example 1: python reverse range my_list = [1, 2, 3] my_list. WebGuide to Reverse Numbers in Python. Did the residents of Aneyoshi survive the 2011 tsunami thanks to the warnings of a stone marker? printing characters of string from the end to the beginning using range in python. Find centralized, trusted content and collaborate around the technologies you use most. To make an actual copy, simply pass that iterator to list: y = list(reversed(x)). range() and xrange() take a third parameter that specifies a step. Again, a subtle detail to note is that if the input list changes during the iteration, then the iterator sees the changes. How can I recognize one? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Need to iterate over a Python list in reverse as fast as possible, The open-source game engine youve been waiting for: Godot (Ep. So to access the numbers, youll need to turn the range into a sequence. However, .__reversed__() isnt intended to be used directly. However, its affected by changes in the input list. The item with the index equal to stop is never included in the final result. We can conclude from the examples why mutable object shouldn't return anything when executing operations on it because it's modifying the internal state of the object directly and there is no point in returning new modified object. Code examples included! This function reverses the arguments passed. rev2023.3.1.43269. Is variance swap long volatility of volatility? To reverse for loop in Python just need to read the last element first and then the last but one and so on till the element is at index 0. If you pass True to its reverse keyword argument, then you get a reversed copy of the initial list: The reverse argument to sorted() allows you to sort iterables in descending order instead of in ascending order. print n This method provides the logic behind reversed(). This site uses Akismet to reduce spam. This change affects the iterator. Generally, the range () is a built-in function in Python that is used to generate a sequence of numbers. Although using reversed() is one of the easiest ways to reverse a range in Python, it is far from being the only one. With a list as an argument, reversed() returns an iterator that yields items in reverse order: In this example, you call reversed() with digits as an argument. Another technique to create a reversed copy of an existing list is to use slice(). If you ever need to reverse an iterator like this, then you should first convert it to a list using list(). We will start by introducing the range() function and work our way through some examples. A code demonstrates how to backward iteration is done with reversed() function on the for-loop. To reverse a list of elements in Python, iterate over the list from the end to start, and append each of the iterated element in a new list. Related Tutorial Categories: This of course is even more true if you don't actually loop over the whole list, and it stops being true if you use the list more than once. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. You end up with a class like this: This class isnt perfect. Applications of super-mathematics to non-super mathematics. In this case you use two colons to represent the start and end arguments, and a negative step for decrementing: In this case a new list is created, with the original order of the list not being affected. Some suggested I use xrange() instead of range() since range returns a list while xrange returns an iterator. start: It is the starting index of the sequence. Python Looping Through a Range. Python Glossary. The range() Function. To loop through a set of code a specified number of times, we can use the range()function, The range()function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number. Example. Method 1: Using step If you set the step value to -1, for-loop print the value in reverse order. This boost library is vepy popular and it has some strong functionalities. Then the loop modifies the numbers by replacing each item with its square value. Method 2: Python loop through a list using for loop and range () Another way to loop through a list is by using for loop with the range () function. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? Note: Under the hood, slicing literals create slice objects. range () function: Using a for loop with range (), we can repeat an action a specific number of times while loop: To repeat a block of code repeatedly, as long as the condition is true. To get the most out of this tutorial, it would be helpful to know the basics of iterables, for loops, lists, list comprehensions, generator expressions, and recursion. It provides you with the required tools to be more proficient when youre working with Python lists. You can make a tax-deductible donation here. If you set step to -1, then you get a slice with the items in reverse order: This slicing returns all the items from the right end of the list (len(digits) - 1) back to the left end because you omit the second offset. Inside this we will have 2 loops, first will print spaces and second will print stars. In case you have used Python 2, you might have come across the xrange() function. As a result, numbers ends up containing square values in reverse order. 2 for .extend..reverse-> First, consider whether an actual second form makes it clear that each of these calls acts on the same To reverse a range in Python, use the reversed () function with the range () function. x 1 Run this Code Output: 10 9 8 7 6 5 4 3 2 Method 2: Using reversed () reversed () is the built-in method that returns the sequence in reverse order. Change color of a paragraph containing aligned equations. For this, we use the reversed () function in Python. This function reverses the arguments passed. This is how you can use Python range to reverse a list of numbers. Negative values can be passed as an increment in order to decrement the output. The range method only works on integers. Beginner Pro First, think carefully about the intent of the code. WebReverse a List using For Loop To reverse a list of elements in Python, iterate over the list from the end to start, and append each of the iterated element in a new list. The range () method also allows us to specify where the range should start and stop. For example, Value This refers to the value stored by the object. [duplicate], The open-source game engine youve been waiting for: Godot (Ep. The syntax of the reverse () method is as follows: list.reverse() reverse () doesnt accept arguments. 6 I imagine it might be that "The Powers That Be" decided that list comprehension is a better paradigm (a valid opinion), and so didn't want to encourage other methods - but it seems perverse to prevent an intuitive method, even if better alternatives exist. WebWe can use the Python range method itself to return a sequence in reverse order, rather than in increasing order. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. It returns an iterator. reversed should be best as it returns an iterator, so it doesn't copy the list, just yields one element at a time. All of these three solutions give the same results if the input is a string: 1. def reverse(text): When you call reversed() on digits, you get a TypeError. What are some tools or methods I can purchase to trace a water leak? python. Should x change? How do I concatenate two lists in Python? Note: To dive deeper into how to use .sort() and sorted(), check out How to Use sorted() and sort() in Python. Since the range() function returns each number lazily, it is commonly used in for loops. If you had code calling a method like .append or .sort on a list, you will notice that the return value is None, while the list is modified in place. Iterating through a dictionary with a for loop yields each key in the dictionary. How do I get the number of elements in a list (length of a list) in Python? Degree in Computer Science and Engineer: App Developer and has multiple Programming languages experience. We went through several examples of how to reverse a range in Python. You can confirm that by calling next() to get the first item in reversed_fruit. An important point to note when youre using reversed() is that it doesnt create a copy of the input list, so changes on it affect the resulting iterator: In this example, you call reversed() to get the corresponding iterator over the items in fruits. There are multiple use cases for Python range reverse and hence it is important that you know how this can be achieved. So, if you need to create sorted lists in reverse order, then sorted() is for you. Is quantile regression a maximum likelihood method? The Python code tries to append the empty string b in reverse order by using the length of the main string and the Python range function. something else. How do I concatenate two lists in Python? Leave a comment below and let us know. Our mission: to help people learn to code for free. That was quick and straightforward! In this tutorial, you took advantage of a couple of Python tools and techniques to reverse your lists and manage them in reverse order. What's the fastest way to iterate over a list in reverse? This knowledge will complement and improve your list-related skills and make you more proficient with them. This is pretty neat, but reversed() is more efficient in terms of execution time and memory usage. Rename .gz files according to names in separate txt-file. Insert operations at the left end of Python lists are known to be inefficient regarding execution time. How to implement pre and post increment in Python lists? Example reverse a list in Python using for loop Simple example code of different ways to Iterate over a List in Reverse Order using for loop. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, You should test it out yourself. Passing the increment as 0 would return an error message. reversed = '' In this tutorial, you'll learn some of the different ways you can reverse lists and list ranges in Python. This is quite convenient when youre working with some data and you need to sort it and reverse it at the same time. You simply provide any sequence to reversed() and it will store its elements in the reverse order. let us discuss the below code step-by-step to depict what it means in Python: Creating a list which contains name of cities, Printing the location of the object created in the memory address in hexadecimal format, Printing the elements from the list cities, separated by a comma. Let's try! rev2023.3.1.43269. l[::-1] is outdated since 2.4 that introduced reversed(). Why is "1000000000000000 in range(1000000000000001)" so fast in Python 3? Additionally, you can also pass an incrementer, the default is set to 1. The reversed () function returns the reversed iteration of the sequence provided as input. The example below creates a list of a range of numbers After each iteration of the outer loop, k is decremented. To do that, you can pass True to their respective reverse argument. You can use this Python feature to reverse the underlying sequence in place. This tool is quite popular in the Python space because it represents the Pythonic way to process lists. Although using reversed () is one of the easiest ways to reverse a range in Python, it is far from being the only one. For instance, you can also pass a negative step argument into the range () function: See how it works? The range goes from 5 (the start) up to 0 (the stop), but with a step of -1, meaning that the numbers decrease. Using custom function is more readable and the better option: Thanks for contributing an answer to Stack Overflow! mylist.reverse().append('a string')[:someLimit]). The same reasoning applies to designing your own APIs. Why does not the + operator change a list while .append() does? for .extend. Python provides zero-based positive indices to walk sequences from left to right. Connect and share knowledge within a single location that is structured and easy to search. This way also naturally gives a modified copy.). Not the answer you're looking for? In the example above, we wanted to fetch the items starting from index 1 up to, but not including, the item with index 3, incrementing one number at a time. WebI can think of some ways to do so in python (creating a list of range(1,n+1) and reverse it, using while and --i, ) but I wondered if there's a more elegant way to do it. PROGRAMS Load Comments The rest of the magic in this example comes from using a value of -1 for step. To calculate this expression the append function will run and the result of expression will be [None, x] and by specifying that you want the second element of the list the result of [None,x][1] will be x. The reversed () function accepts a single parameter, which is the sequence to be reversed. The range() method also allows us to specify where the range should start and stop. If thats your case, then you have several options. The numbers in the list are specified based on the argument passed. This article covers the concept of range in python with various examples including range in for loop, float numbers, difference between range & xrange etc. How to extract the coefficients from a long exponential expression? For any of the above, of course, we can also make a modified copy by explicitly making a copy and then using the in-place method on the copy. return reversed Webhow to reverse a string in list by for loop code example. However, arguments put forward in other comments (by Guido himself, no less!) This question is specifically about Python's design decision to return None from mutating list methods like .append. Reversing and working with lists in reverse order might be a fairly common task in your day-to-day work as a Python coder. Get tips for asking good questions and get answers to common questions in our support portal. remove None value from a list without removing the 0 value, Sort list while pushing None values to the end. Range Function Range function requires a specific sequence of numbers. How to allow list append() method to return the new list. There shouldn't be any new You can do it with the range Its worth mentioning that similar to list indexing in range starts from 0 which means range ( j ) will print sequence till ( j-1) hence the output doesnt include 6. In other words, it doesnt modify the input list. Python makes it easy to generate a range in reverse by passing a negative value into the step parameter. The simple answer to solve your problem could be like this: for i in range(100): here is how you can do that: when lambda wants to calculate to output, first it should calculate the [x.append(my_new_element), x] expression. Join us and get access to thousands of tutorials, hands-on video courses, and a community of expertPythonistas: Master Real-World Python SkillsWith Unlimited Access to RealPython. You need the base case to end the recursive loop. At the end of the loop, you get a new list with the items of a_list in reverse order. How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? Complete this form and click the button below to gain instantaccess: No spam. Identity This refers to the address that the object refers to in the computers memory. Or, to rephase - "The general design principle in Python is for functions that mutate an object in-place to return None" is a true statement, but does nothing to explain. You can use the list() or tuple() functions for this (and you can learn more about lists and tuples in this article): Another way to access the numbers in the range is to iterate over it in a for loop. Answer: Reverse letters in words and sentence both: In example taking user input, you can use any sentences. Tip: Since Python 1.4, the slicing syntax has had a third argument, called step. What tool to use for the online analogue of "writing lecture notes on a blackboard"? See Is making in-place operations return the object a bad idea?. EDIT: I just learned from another answer that this principle is called Command-Query separation. Does With(NoLock) help with query performance? Range in Python for loop, we have used Python 2, 3 ] my_list Python and improve Python!, if you ever need to reverse them copying the list are specified based on the argument.. Iterator to list: y = list ( avoid a separate statement chaining. The examples in this example comes from using python reverse for loop range value of -1 for step ranges in Python then. Passing a negative step value to always be less than the value where we used range ( function..., we want to start at a number thats greater than the value stored by the refers. For example range ( ) function returns the reversed iteration of the loop always includes and... Example 1: Python reverse range my_list = [ 1, 2, you can pass to. Will print stars rest of the outer loop, the slicing syntax has had a third argument, called.... Always be less than the value in reverse order and well explained science. The reverse python reverse for loop range ) your case, you can confirm that by calling next ( ) isnt to... A long exponential expression ordered python reverse for loop range so Python doesnt know how this can be passed as an increment in to... Runs faster, and uses substantially less memory a subtle detail to note that! Will start by introducing the range ( ) is way more readable and better. To reversed ( ) a_list in reverse order knowledge helps you improve your skills. Done with reversed ( ) does a reverse loop in Python is to use the + operator reverse! List methods like.append same time returns a list using list ( reversed ( x ) ) used directly get... Gain instantaccess: no spam sort list while pushing None values to end., arguments put forward in other words, in reverse order ).append ( ' a string ' [... Increment as 0 would return an error message step argument into the range ( ) for... A copy of an existing list is to use for the online analogue of `` writing lecture notes a. Program operates as follows: list.reverse ( ) is a built-in function in.... Loop iterates through a reversed copy of an existing list is to the... Value from a CDN a range in Python how can I get a copy... The 3rd argument being the increment to use the built-in range ( ) function returns each number lazily, is! Words, it is important that you know how this can be passed as an in. A method after.reverse ) value into the step value to note is that if the list... In words and sentence both: in example taking user input, you can pass True to respective. Pythonic way to process Python lists the index equal to stop is included. Study groups around the world last element down to the firstin other words, it python reverse for loop range! Common questions in our support portal its affected by changes in the computers memory equal to stop is included. ( NoLock ) help with query performance used directly affecting the input list we! Up with a for loop the program operates as follows: list.reverse ( ) function in?. Hood, slicing literals create slice objects that by calling next ( ) function allows you to generate sequence... Using custom function is like this, we python reverse for loop range used boost library tip: Python. The dictionary you want to start at a number thats greater than the value stored the. Is done with reversed ( ).append ( ) since range returns list! It at the same time list ( length of a range in reverse.gz files according to.! Post increment in Python improve your list-related skills and make you more proficient with them to,! Method is as follows: list.reverse ( ) function makes it super easy to search Python is to slice! Use slice ( ) function starts at 5 and ends at 1 with Python lists work... Long exponential expression take a third parameter that specifies a step cut sliced along a fixed variable remove value... To learn Python and improve your Python skills over time from mutating list methods.append! Generally, the default is set to 1 should first convert it to a of... List by for loop code example: here, the open-source game engine youve been waiting for: (! Intended to be reversed 1000000000000000 in range ( ) reverse ( ) method reverse ( ) is a built-in in... Way to create sorted lists in reverse order might be simplified to improve reading and learning is a built-in in... 3 ] my_list this section, youll learn how to properly visualize the change of variance of range! Signature definitions in IDEs ) in Python 3 tool is quite convenient when youre with... My_List = [ 1, 2, 3 ] my_list None values to the address the... Blackboard '': Compared to extended slicing, reversed ( ) doesnt accept arguments to 1 were type hints and! This tool is quite popular in the computers memory an incrementer, the 3rd argument being the to! Simply provide any sequence to be reversed Python coder which I use from a CDN and programming articles, and... Isnt intended to be used directly properly visualize the change of variance of a library which I use a... The first item in reversed_fruit use the reversed ( ) function using loops, first will print and... Ways to reverse a list ) in Python for loop, you can pass True their. Around the technologies you use most written, well thought and well computer! Ends up containing square values in reverse order list methods like.append see is making operations... You know how this can be passed as an increment in order to the. ) since range returns a list ( reversed ( ) special method returns an iterator over the.! Through some examples technologies you use most::-1 ] is outdated since that... Single location that is structured and easy to generate a range in Python is a built-in function Python. Increment in order to decrement the output `` peeks '' at signature definitions in IDEs ) in use. Elements in a list ( avoid a separate statement when chaining a method after.reverse?... Would return an error message input list mutating list methods like.append the default is set 1. See is making in-place operations return the new list with the items of the reverse ( ) returns! Numbers within a single parameter, which takes advantage of index substitution there... But for iteration, then you have several options.__iter__ ( ) method (... 1.4, the range ( ) function starts at 5 and ends at 1 how you confirm! A range in Python method returns an iterator over the sequence in order... Use from a list of numbers method 1: using step if you want to use ( documented ). Return the current list in reverse order iterates through a reversed copy of an existing list in reverse order python reverse for loop range...: y = z-x if the condition satisfies, then you have several options positive to... Increment as 0 would return an error message ) ) included in the input list changes during iteration! Thousands of freeCodeCamp study groups around the technologies you use most.gz files according requirements. Respective reverse argument and click the button below to gain instantaccess: no spam [,! To start at a number thats greater than the stop that specifies a step note: Under hood... Get a new list with the index equal to stop is never included in the final.... Will print spaces and second will print spaces and second will print spaces and second will print spaces and will. An iterator the last element down to the warnings of a library which I use from a exponential... At 1 at a number thats greater than the value in reverse order I get a copy numbers. Third parameter that specifies a step know how this can be passed as an increment order... N this method provides the logic behind reversed ( ) a fairly common in...: most of the loop modifies the numbers, youll learn python reverse for loop range to learn Python and improve your skills! ( ' a string ' ) [: someLimit ] ) ) doesnt arguments. With negative steps, we have used boost library is vepy popular and it store. This section, youll learn how to implement the.__iter__ ( ) take a third parameter specifies. Additionally, you might have come across the xrange ( ).append ( ) this! With the required tools to be reversed Pro first, think carefully about the intent of the sequence place!: most of the outer loop, the range ( ) method reverse ( ) and it will store elements. Trick, you get a new list with the items python reverse for loop range a_list in order! Youve been waiting for: Godot ( Ep fixed variable list methods like.append copying the.! We went through several examples of how to implement the.__iter__ ( function... Xrange returns an iterator like this, then only print the value in order! In this section, youll learn how to backward iteration is done with reversed ( function. To create a reverse loop in Python is because sets dont keep items., it doesnt modify the input list sort it and reverse it at the left end of magic. A separate statement when chaining a method after.reverse ) - > probably simplest... Example comes from using a value of -1 for python reverse for loop range had a third argument, step... `` 1000000000000000 in range ( ) instead of range ( ) the fastest way to create a reversed copy the!

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