rev2023.7.24.43543. Thanks again. Line integral on implicit region that can't easily be transformed to parametric region. What are some compounds that do fluorescence but not phosphorescence, phosphorescence but not fluorescence, and do both? Asking for help, clarification, or responding to other answers. It will not turn on. Making statements based on opinion; back them up with references or personal experience. How to replace one element from a list with several element from another list? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Replacing items in 1 list to items in another list in python. To learn more, see our tips on writing great answers. Method #1 : Using replace () + list comprehension The combination of above functionalities can be used to perform this task. In python, what is the best way to replace an element in a list with the elements from another list? Why is there no 'pas' after the 'ne' in this negative sentence? Replace list elements. But anyway, +1. So for example I have the list a = ['b', 'c']and want to replace 'b' with 'd', 'e' which would give me the list a = ['d', 'e', 'c']. Another option is to write a generator function: Perhaps you can create a 2d list and then flatten it with itertools.chain: You can easily generalize this to multiple replacements: You can use the slice syntax to replace a number of elements with another: The reversing part is important because each replacement makes the list longer, when iterating backward the index should remain valid. Could ChatGPT etcetera undermine community by making statements less significant for us? replace one element in multiple lists of list. (Bathroom Shower Ceiling). You'l learn how to replace an item at a particular index, how to replace a particular value, how to replace multiple values, and how to replace multiple values with multiple values. Course Outline. How can kaiju exist in nature and not significantly alter civilization? Let's summarize each method: List indexing: We use the index number of a list item to modify the value associated with that item. The idea is as such: "For each word in the primary list, if that word is X, replace it with all the words in the secondary list.". Replace elements in a list of lists python - Stack Overflow Is not listing papers published in predatory journals considered dishonest? Another alternative would be. Method 1: Using List Indexing We can access items of the list using indexing. How can I animate a list of vectors, which have entries either 1 or 0? Given two lists (a and b), I'd like to replace three elements of list 'a' with three elements of list 'b'. Asking for help, clarification, or responding to other answers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. rev2023.7.24.43543. I hope that this helps anyone else who is looking out for something similar. How does hardware RAID handle firmware updates for the underlying drives? Python String replace() Method - W3Schools Conclusions from title-drafting and question-content assistance experiments How to replace multiple items in a list in a single statement in python, Replacing several strings in a list in a single statement, replace one element in multiple lists of list, Replace multiple elements in a list with a single element, Replacing multiple values by a single value in a list using python, Replace all list elements based of other list elements in python, Python: replacing multiple list items by one. Should I trigger a chargeback? The problem in your code was because of two reasons in the following line: trying to assign a list to a specific element in primary_list. Thanks for contributing an answer to Stack Overflow! Is saying "dot com" a valid clue for Codenames? You can assign directly to your list of lists if you extract indexing integers via enumerate: More Pythonic would be to use a list comprehension to create a new list. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, I gather the point here is to splice over. 2 Answers Sorted by: 2 If you've a python list you can do something like this : toReplace = [0,5,7] targetIndices = [11, 99, 2] for i,j in zip (toReplace, targetIndices): a [i] = b [j] If you've a numpy array, it's even simpler : a [toReplace] = b [targetIndices] #i.e, a [ [0,5,7]] = b [ [11, 99, 2]] Share Follow edited Oct 28, 2017 at 20:50 Not the answer you're looking for? Do I have a misconception about probability? Why would God condemn all and only those that don't believe in God? Syntax string .replace ( oldvalue, newvalue, count ) Parameter Values More Examples Example Replace all occurrence of the word "one": Replacing element in list with multiple elements [duplicate], list.extend and list comprehension [duplicate], Improving time to first byte: Q&A with Dana Lawson of Netlify, What its like to be on the Python Steering Council (Ep. The values of the Series are replaced with other values dynamically. Then apply this mapping to every member of r using a list comprehension: new_r = [my_mapping [elem] for elem in r] Share. Making statements based on opinion; back them up with references or personal experience. We could replace elements in a Python list in several ways. Method 1: Using the list indexing To replace a value in a Python list, you can use list indexing. What would naval warfare look like if Dreadnaughts never came to be? Can someone help me understand the intuition behind the query, key and value matrices in the transformer architecture? Connect and share knowledge within a single location that is structured and easy to search. Why would God condemn all and only those that don't believe in God? How can I animate a list of vectors, which have entries either 1 or 0? How to match and replace list elements in Python? You are having four references to same object by * 4, use instead list comprehension with range for counting: To explain little more concretely the problem: Thanks for contributing an answer to Stack Overflow! How to automatically change the name of a file on a daily basis. Python | Pandas Series.replace() - GeeksforGeeks Release my children from my debts at the time of my death. How feasible is a manned flight to Apophis in 2029 using Artemis or Starship? Python: Replace an element in a list with an element from another, Replace elements of a list by elements of other list, Replacing elements in a list of lists, with elements from another list, Replace specific values in a list with values from another list, Substituting elements of a list with elements of another list. @kojiro May be I didn't read the question properly, for just one occurrence of course this is an overkill. Connect and share knowledge within a single location that is structured and easy to search. Geonodes: which is faster, Set Position or Transform node? It inserts the secondary list into the primary list at the correct index: Not only is it redundant, but it also just does the same as above. Airline refuses to issue proper receipt. Thank you very much for it, The problem is if you have nested lists that will not work. How can kaiju exist in nature and not significantly alter civilization? Basic question about replacing entries in list of lists according to if condition. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Using itertools.chain, making sure that replacements has iterables: I would go with a generator to replace the elements, and another generator to flatten it. Python Program to swap two elements in a list | Replace an Element in originalLeft = slist [0:start] originalLeft.extend (temp) You also need the segment from stop to the end of your original sublist. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. replace one list with another list in python in the same array, Improving time to first byte: Q&A with Dana Lawson of Netlify, What its like to be on the Python Steering Council (Ep. Thanks for contributing an answer to Stack Overflow! Continue with Recommended Cookies. Not the answer you're looking for? Thoughts? Replacing items in 1 list to items in another list in python. I have the following code: a = [??? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Connect and share knowledge within a single location that is structured and easy to search. After replacing it must be: Of course, it is possible to do with slicing (I'm sorry that I didn't write it in the question), but the problem is that it is possible that you have more than one replace_this value in the list. So. +1. [GCC 4.4.3] on linux2. Loop methods are discouraged, as it takes more execution time and memory. For example, if only the second of two values contains names which need checking: You can try using a dictionary object of python. How do I make a flat list out of a list of lists? How many alchemical items can I create per day with Alchemist Dedication? First create a mapping from one list to another: my_mapping = dict (zip (x, y)) The zip part is mainly a formality: dict expects the argument to be a sequence of pairs, rather than a pair of sequences. The first two methods modify an existing list whereas a list comprehension creates a new list with the specified changes. Conclusions from title-drafting and question-content assistance experiments Python: Replacing item in a list of lists, Python: Change an element in a list of lists. python: how to replace a string in a list of string with a list of strings? By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Is there a way to speak with vermin (spiders specifically)? 592), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Suppose that you want to replace Banana with Pear. Is there a word for when someone stops being talented? Hi! Can a creature that "loses indestructible until end of turn" gain indestructible later that turn? How do replace a list with another list in python? Python List Exercise with Solution [10 Exercise Questions] - PYnative As immutable objects, you need to assign the strings to elements in your list of lists. is absolutely continuous? Why is "1000000000000000 in range(1000000000000001)" so fast in Python 3? To learn more, see our tips on writing great answers. How does hardware RAID handle firmware updates for the underlying drives? Connect and share knowledge within a single location that is structured and easy to search. Conclusions from title-drafting and question-content assistance experiments replace item in a string if it matches an item in the list, Python: replace string, matched from a list, English abbreviation : they're or they're not. In that case, you can use the following syntax to perform the replacement: As you can see, both Banana and Apple got replaced with Pear in 5 locations: Alternatively, you can achieve the same results with the help of pipe (|): Youll now see that Banana was replaced with Pear (as highlighted in yellow), while Apple was replaced with Watermelon (as highlighted in green): So far, you have seen how to work with texts/strings in your lists. Find centralized, trusted content and collaborate around the technologies you use most. Airline refuses to issue proper receipt. How to Replace Values in a List in Python? - GeeksforGeeks May I reveal my identity as an author during peer review? Term meaning multiple different layers across many eras? The remove () method in Python list, removes the specified element using the element name. Making statements based on opinion; back them up with references or personal experience. If we want to replace the first item of the list we can di using index 0. How do you replace a string in a list with two of the same string? If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed? Advertisements Python provides a str.replace () function i.e. 592), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Exercise 1: Reverse a list in Python Exercise 2: Concatenate two lists index-wise Exercise 3: Turn every item of a list into its square Exercise 4: Concatenate two lists in the following order Exercise 5: Iterate both lists simultaneously Exercise 6: Remove empty strings from the list of strings Here's an option using an intermediate result list: You should create another list and add primer list elements and secondary list elements. l=[1,2,3,4] for i,x in enumerate(l): l[i]=x+1 this changes the list How to replace one element from a list with several element from another list? If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed? Not the answer you're looking for? Currently I am using an expression like this: As I need to do such operations very frequently with lots of different arrays I am wondering if there is a more compact solution for this problem (the number of elements I need to replace is always 3 though). This comes in use when we don't care about the index number of the elements in Python list. I have specified my question more, I always need to replace three element at a given time. Can I opt out of UK Working Time Regulations daily breaks?