If start is non-zero, then elements from the iterable are skipped until start is reached. Does anyone know what specific plane this is a model of? How do you get the magnitude of a vector in Numpy? Python "while" Loops (Indefinite Iteration) - Real Python Ubuntu 23.04 freezing, leading to a login loop - how to investigate? What's the purpose of 1-week, 2-week, 10-week"X-week" (online) professional certificates? What's the DC of Devourer's "trap essence" attack? What loop can I use that runs through the entire list? Note that this will copy objects by reference, so may lead to some very difficult to find bugs. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Using the len() Function in Python - Real Python Is there a way to specify which pytest tests to run from a file? Initialize an empty string named as a result list comprehension: create 2 items for each item in input list? Modified 10 years, 6 months ago. 592), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Keep looping until no further changes to list. How to repeat each of a Python list's elements n times with itertools only? I think you need to use. I'm new to Python. How did this hand from the 2008 WSOP eliminate Scott Montgomery? Write a procedure that takes a list of numbers, nums, and a limit, limit, and returns a list which is the shortest prex of nums the sum of whose values is greater than limit. To learn more, see our tips on writing great answers. You can use the function with many different data types. Free Bonus: Click here to get our free Python Cheat Sheet that shows you the basics of Python 3, like working with data types, dictionaries, lists, and Python functions. It's highly unlikely that the performance of creating a list with identical elements will be a critical component of the performance of a python program. @stwhite So you want to preserve the order or "occurrence"? But I still don't see why you can't use. python - Repeat list to max number of elements - Stack Overflow Was the release of "Barbie" intentionally coordinated to be on the same day as "Oppenheimer"? The amount of items duplicated is correct, but the order is not. Is not listing papers published in predatory journals considered dishonest? Python Loops - W3Schools python - How to repeat one list to match the length of another? - Stack How do I make a flat list out of a list of lists? Below is the input list and the desired output. Creating a list, then changing one elem, and the whole list gets changed? How can the language or tooling notify the user of infinite loops? Then we put this all together. How does your approach differ from the other answers given? How to create an overlapped colored equation? Making statements based on opinion; back them up with references or personal experience. Is there a word for when someone stops being talented? (If you don't want to modify it in-place, you can copy the list and return the copy, which won't modify the original. Conclusions from title-drafting and question-content assistance experiments How to find the maximum number in a list using a loop? Do I have a misconception about probability? Not the answer you're looking for? Example Print all items, using a while loop to go through all the index numbers thislist = ["apple", "banana", "cherry"] i = 0 If the list is less than the maximum_length then the list should be expanded, but should never exceed the max length. How to Create a Repeat List with List Comprehension? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Stopping power diminishing despite good-looking brake pads? Do I have a misconception about probability? No problem. Improving time to first byte: Q&A with Dana Lawson of Netlify, What its like to be on the Python Steering Council (Ep. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Circlip removal when pliers are too large. Can a creature that "loses indestructible until end of turn" gain indestructible later that turn? But now, I see that the OP might want to. Doing, [3]*3 gives the result of [3,3,3], replacing this with n we get [3,3,3,3] (n times) Using a list comprehension we can go through each elem of the list and perform this operation, finally we need to flatten the list, which we can do by list(itertools.chain.from_iterable(lst)). Not the answer you're looking for? Is there an exponential lower bound for the chromatic number? Is it better to use swiss pass or rent a car? This would create abcabcabcabc - Marcus Lind. How can kaiju exist in nature and not significantly alter civilization? Circlip removal when pliers are too large. Here a more "explicit" version that works with any length of LA. In Python you can iterate over the list itself: There's another built-in function called enumerate(), which returns both item and index: but if you are accessing the list elements anyway, it's more natural to iterate over them directly: If you want to skip the the first element, you can slice the list [tutorial]: can you do another for loop inside this for loop. Why is a dedicated compresser more efficient than using bleed air to pressurize the cabin? If the first number is greater than the second then they are subtracted and this new number replaces the first num. The list will not be cloned: all the elements will refer to the same list! Here are some other answers discussing sorting like this. This worked, Thank you Moses for the extra explanation I needed that. Movie about killer army ants, involving a partially devoured cow in a barn and a scene with a man driving around dropping dynamite into ant hills. And in fact we can modify the above to verify this: Not that there haven't been enough answers to this question, but there is a repeat function; just need to make a list of and then join the output: Won't scale forever, but it's fine for smaller strings. . St. Petersberg and Leningrad Region evisa. Which denominations dislike pictures of people? The outer list stores four references to the same inner list. Does the US have a duty to negotiate the release of detained US citizens in the DPRK? 592), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. What is the smallest audience for a communication that has been deemed capable of defamation? How can you manipulate a string to equal the length of another string? What should I do after I found a coding mistake in my masters thesis? This one repeat the string X times, it does not repeat it until X length. As an example, call the repeated list ra. Then that is totally not related to having the possibility of strings as values or not. Connect and share knowledge within a single location that is structured and easy to search. I have a list [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] and I want to repeat a list n times. [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]. Why is a dedicated compresser more efficient than using bleed air to pressurize the cabin? How to create an overlapped colored equation? Btw, a better way to create that repeating list up to a maximum length, esp for large lists is, Repeat items in list and maintain order of occurrence until maximum length of list is reached, Here are some other answers discussing sorting like this, Improving time to first byte: Q&A with Dana Lawson of Netlify, What its like to be on the Python Steering Council (Ep. Multiplying a list gives us the same elements over and over. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Remember that Stack Overflow isn't just intended to solve the immediate problem, but also to help future readers find solutions to similar problems, which requires understanding the underlying code. You can also use the While loop of Python to traverse through all the elements of the List variable. Jason Scheirer's answer is correct but could use some more exposition. Can a creature that "loses indestructible until end of turn" gain indestructible later that turn? Line-breaking equations in a tabular environment. Python For Loops - W3Schools I don't the question has anything specifically to do with pandas tbh (I see you've already removed/rolled back a tag edit) @AndyHayden I first removed it because I thought it was irrelevant. Term meaning multiple different layers across many eras? How can I convert this half-hot receptacle into full-hot while keeping the ceiling fan connected to the switch? Let's see all the different ways to iterate over a list in Python, and performance comparison between them. Python | Repeat each element K times in list - GeeksforGeeks By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I am trying to transfer from R to Python, and I'm surprised I have to import a library to do this? - how to corectly breakdown this sentence. Connect and share knowledge within a single location that is structured and easy to search. python - Taking the first few items of a list until a target sum is python - How to repeat one list to match the length of another? To learn more, see our tips on writing great answers. Can someone help me understand the intuition behind the query, key and value matrices in the transformer architecture? Welcome to the site, but your solution is the same as an. Repeat Elements Of a List Using the extend () Method Using the * Operator Conclusion How To Repeat Elements of a List in Python To repeat the elements in a list in Python, we insert all the existing elements of a list into the same list. Asking for help, clarification, or responding to other answers. Efficient way to create list of same numbers? Can a creature that "loses indestructible until end of turn" gain indestructible later that turn? Here v take the input n from the user and this n is the length of the list. :). If the generated list is large, it can be better to use a generator, so that items are generated one at a time on the fly without creating the whole large list in memory: How it works: itertools.cycle will cycle on lst indefinitely, and we keep only the len(lst) * times first items using itertools.islice, Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. This is often called a Python 3 feature, but according to PEP 238, it was introduced all the way back in Python 2.2. . Making statements based on opinion; back them up with references or personal experience. rev2023.7.24.43542. Given that. Updating Variables The programs so far have defined and used variables, but other than in early shell examples we have not changed the value of existing variables. This is one way to do it using a list comprehension, though it's increasingly wasteful as the length of the rpt string increases. 1. The value of speed of light in different regions of spacetime. Range of 1-4 means that the output will be 1,2,3. n defines the number of times you want to repeat. "Print this diamond" gone beautifully wrong. There is always a pythonic way to do it. [duplicate], find the maximum number in a list using a loop, the exact same question you asked 30 minutes ago, docs.python.org/2/tutorial/controlflow.html, Improving time to first byte: Q&A with Dana Lawson of Netlify, What its like to be on the Python Steering Council (Ep. Sure you can. e.g. Connect and share knowledge within a single location that is structured and easy to search. Depending on your use-case, you want to use different techniques with different semantics. Repeating list in python N times? What happens if sealant residues are not cleaned systematically on tubeless tires used for commuters? Beware doing this with mutable objects, when you change one of them, they all change because they're all the same object: But with immutable objects, you can make it work because you change the reference, not the object: But again, mutable objects are no good for this, because in-place operations change the object, not the reference: Of course itertools gives you a iterator instead of a list. This is what I use when I only need to iterate over the string (no join needed then). How can I convert this half-hot receptacle into full-hot while keeping the ceiling fan connected to the switch? How can the language or tooling notify the user of infinite loops? Could ChatGPT etcetera undermine community by making statements less significant for us? You can use the resulting iterator to quickly and consistently solve common programming problems, like creating dictionaries. Python provides three types of looping techniques: Python Loops for Loop The graphical representation of the logic behind for looping is shown below: Figure - for loop Flowchart: Syntax: for iterating_var in sequence: #execute your code Example 01: for x in range (0,3) : print ('Loop execution %d' % (x)) Output: islice (iterable, start, stop [, step]) Make an iterator that returns selected elements from the iterable. Is there a word for when someone stops being talented? I'm finding the maximum number in a list on Python by using a loop. The purpose of this question is to maintain the distribution of the original list. You could learn about Python loops here: find the maximum number in a list using a loop. You should note that if e is for example an empty list you get a list with n references to the same list, not n independent empty lists. 1. How to repeat a list's elements in another list content until the length of the second list fulfilled? The problem with the former is that it resolves your iterable into a tuple by merit of the unpacking operator which partially defeats the wonderfully laziness of, Repeat a list within a list X number of times, Best way to extend a list with itself N times. Was the release of "Barbie" intentionally coordinated to be on the same day as "Oppenheimer"? rev2023.7.24.43542. I have found the repeat function in Numpy, but one is only able to specify number of times to repeat. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Can somebody be charged for having another person physically assault someone for them? This is often called a Python 3 feature, but according to PEP 238, it was introduced all the way back in Python 2.2. What information can you get with only a private IP address? Not the answer you're looking for? Works with any order, sorts on the original order. What's the translation of a "soundalike" in French. Here are three ways one can create a list with a single element repeated 'n' times. Guess I have to read up on what a standard library is. At first glance it seems that repeat is the fastest way to create a list with n identical elements: The function itertools.repeat doesn't actually create the list, it just creates an object that can be used to create a list if you wish! The for loop is helpful to get the values within a certain specified range. I have a list of values in a list. I have found the repeat function in Numpy, but one is only able to specify number of times to repeat. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Is there a way to speak with vermin (spiders specifically)? Line integral on implicit region that can't easily be transformed to parametric region, Avoiding memory leaks and using pointers the right way in my binary search tree implementation - C++. Conclusions from title-drafting and question-content assistance experiments python - check at the end of the loop if need to run again, Stopping a while loop when a certain element of the list is reached. Below is my code to produce the list. Release my children from my debts at the time of my death. The outer loop iterates through each element of test_list, and the inner loop iterates K times to repeat each element. rev2023.7.24.43542. Example Get your own Python Server Print each fruit in a fruit list: fruits = ["apple", "banana", "cherry"] for x in fruits: print(x) Try it Yourself The for loop does not require an indexing variable to set beforehand. Is not listing papers published in predatory journals considered dishonest? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Ubuntu 23.04 freezing, leading to a login loop - how to investigate? Ask Question Asked today Modified today Viewed 45 times -2 I have two lists: A = ['a', 'b', 'c', 'd', 'e'] B = ['c', 'a', 't'] How could I repeat the items of B to match the length of A? minimalistic ext4 filesystem without journal and other advanced features. Ok, thank you very much! Way to assign domain and/or value restrictions to multiple variables at once? Find centralized, trusted content and collaborate around the technologies you use most. This one repeat the string X times, it does not repeat it until X length. Connect and share knowledge within a single location that is structured and easy to search. Is not listing papers published in predatory journals considered dishonest? Use of the fundamental theorem of calculus. What is an efficient way to repeat a string to a certain length? Just by writing the value that you would like to produce and the number of repetition. rev2023.7.24.43542. of course you can have a loop similar to Java: but I never actually used loops like this, or you want to produce another collection from a list, also there are itertools module that covers most of iteration related cases, also please take a look at the builtins like any, max, min, all, enumerate. Repeat Elements of a List in Python - PythonForBeginners.com The linked question is about numpy arrays, this one is about python lists. Is there a word in English to describe instances where a melody is sung by multiple singers/voices? Iterate over a list in Python - GeeksforGeeks Conclusions from title-drafting and question-content assistance experiments Is there a more efficent way to extend a string? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Python How to repeat a list's elements in another list content until the length of the second list fulfilled? Is it better suited for particular situations than other answers? How can the language or tooling notify the user of infinite loops? I had forgotten to add explanation and was about to edit. What loop can I use that runs through the entire list? To learn more, see our tips on writing great answers. Python: Repeat elements in a list comprehension? The function len () is one of Python's built-in functions. You can go through a list with a for loop like: However, an easier way to get the maximum item in a list (which appears to be what you want) is: Repeating a block of code n times, where n is the length of some_list is done like this: But as David already stated, simply calling max(lst) would do the job. 592), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned.