Hint: you can modify the first argument to. This is a three-step process: Pass a lambda function and the string to the map () function. Primitive types (, While this is very clever (+1) I think it pretty much proves the point that for loops often make for clearer code. This question already has answers here : Understanding recursion [closed] (20 answers) Closed 9 months ago. You can also repeat a string separated by a certain separator. What is a pythonic way to print a string multiple times on one line, separated by spaces? Syntax : numpy.repeat (arr, repetitions, axis = None) Parameters : array : [array_like]Input array. This brings light to another topic: "Code Repetition in Python". What's the point of being cryptic again? Can somebody be charged for having another person physically assault someone for them? 7 JavaScript Concepts That Every Web Developers Should Know. Stream.of(new String[times]).map(n -> "abc").collect(Collectors.joining()); +1 for recursion and obviously being a lisp hacker. So, I decided to take two variants and see which one performed better. By default, the values of start and step are 0 and 1 respectively. But you shouldn't try to avoid for loops "at all costs" because if it costs you readability, maintainability, and speed, you're being counterproductive. Repeat Elements of a List in Python - PythonForBeginners.com I'll remove the downvote as soon as I could (it's blocked until question is edited), @Nicolai source code for it, just in case someone cares. Here are three ways one can create a list with a single element repeated 'n' times. Returns: repeated_arrayndarray The repeat() function is the function that will actually let you repeat the code n number of times in python. The easiest way to repeat a string n times is to use the Python * operator. It will return an error if we were to change the axis. Improving time to first byte: Q&A with Dana Lawson of Netlify, What its like to be on the Python Steering Council (Ep. It should create a new file named 7 JavaScript Concepts That Every Web Developers Should Know, Variable Hoisting in JavaScript in Simple Words, Difference between Pass by Value and Pass by Reference in JavaScript. If M is greater than the length of the word. You'll be surprised by the result. I cannot use loops, i must only use recursion. How to Delete Last Field in LinuxHow to Harden Apache Server in CentOSHow to Display Specific Columns in LinuxHow to List Active Connections in PostgreSQLHow to Create Swap Space in Ubuntu/Debian By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If you still have any doubts, solve your queries with our expert python tutors. 2010-2021 - Code Handbook - Everything related to web and programming. Yes someone might add something clever, but by avoiding a for loop. How put a space in a string mutiplication? 1. axis : Axis along which we want to repeat values. Connect and share knowledge within a single location that is structured and easy to search. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Does the required output have a trailing space after the second. Conclusions from title-drafting and question-content assistance experiments How do I check whether a file exists without exceptions? Implement the function duplicateLines(fileName), which given a string Python3 test_string = "GeeksforGeeks" K = 30 print("The original string : " + str(test_string)) res = (test_string * (K//len(test_string) + 1)) [:K] It is an atomic cognitive unit! Conclusions from title-drafting and question-content assistance experiments Python - concatenate a string to itself, multiple times. Writing Readable JavaScript Code. Converting to series -> a = pandas.Series([list or data]), Calling for repeat() -> pandaSeries.repeat( n, axis ). Proof that products of vector is a continuous function. In the code above, we created a string variable text, repeated it 4 times, and stored the repeated string inside the new string variable repeated. # here, the fruit is temporary variable while fruits is the list, # Program: using range() function in Python, # Problem : get a sequence of natural numbers from 1 to 6, # Note that the number n is 1 more than the last digit, # Program: Defining and calling functions, # Program: Using itertools.repeat() function to repeat n times in Python, # import repeat function from itertools module, # Program: Using numpy.repeat() function to repeat n times in Python, "/usr/lib/python3/dist-packages/numpy/core/fromnumeric.py", # Program: Using pandas module to repeat n times in Python, # Program: To repeat a string n times in Python, Boundary Traversal of Binary Tree (with code), Find Distance between Two Nodes of a Binary Tree (with code), Maximum Circular Subarray Sum (with code), 'Start' represents the number to begin the sequence with, 'stop' represents the number to end the sequence at. See. public class Main { public static void main (String [] args) { String str = "Studytonight"; System.out.println (str); // Repeat String String newStr = str.repeat (3); System.out.println (newStr); } } Studytonight It is just like multiplying a string N times. 6 Answers Sorted by: 60 string = 'Hello There' print ' '.join ( [string [:5]] * 2) Share Improve this answer texts = l * 3 print(texts) texts will be: ['tutorialexample', 'tutorialexample', 'tutorialexample'] Join all elements in list print(c.join(texts)) Then you will get the result: tutorialexample,tutorialexample,tutorialexample From this code above, we can find we also can use * to repeat python list. The code example below shows how to repeat a string to a certain length with a user-defined function. Types of loops in Python 1.1.1. Does the US have a duty to negotiate the release of detained US citizens in the DPRK? We and our partners use cookies to Store and/or access information on a device. Rather saying that by writing less code, and using library functions rather than reinventing the wheel I reduce the bug surface area(Lines of Code) while increasing readability. A lot of effort went into profiling and optimizing that implementation. Using recursion, you can do the following (using ternary operators, one line max): I know, it's ugly and probably not efficient, but it's one line! If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed? For loops involving indexes tend to generate off by one bugs. The Input/Separator are not only limited to String-Class, but can be every Class which implements CharSequence (e.g. Example: str = 'Python program' print(str*3) The above lines of code will display the following outputs: It's seems to be the cleanest way without using any external API oder utility method! I think that this question is just an, @Stephan: String produced via Collection.toString (and Arrays.toString) are, In my more extreme test, I produce a 1,700,000,000 (1.7 gigas) string repeat length,, using -Xms4937m. Note:- I have assumed the value of n to be 3 in the above example although you can take any value you want for n. Duplicate lines. Get Help Now. Does anyone know what specific plane this is a model of? This is a test Like the Amish but with more technology? Now if I were to tell you that you can also repeat a specific part of string n times in Python, then? This could be reduced, but I wanted to be verbose for its self-explanatory nature. Sometimes we need to repeat the string in the program, and we can do this easily by using the repetition operator in Python. Ugh, thank you @zyxue! Generate a List of Random Numbers in Python, Insert Data Into an SQLite Database Using Python, Concept of Longest Increasing Subsequence in Python, Fix Python Cannot Concatenate STR and Int Objects Error, Access the Session Variable in JavaScript. Find centralized, trusted content and collaborate around the technologies you use most. This is the naive method to find the string in which we try to get the root string by repetitive division of string. whenever i try to make a function that does this, the function decreases the length of the string, progressively: What is wrong with this attempt? I like the trick of counting up so you can use a default, this is great and easy to understand! 592), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Using the * operator 1 2 3 4 5 lst = [2, 4, 6, 11] lst_new = lst * 3 print(lst_new) Output: [2, 4, 6, 11, 2, 4, 6, 11, 2, 4, 6, 11] The default separator is whitespace although you can take any separator you want. The repetition operator is denoted by a ' * ' symbol and is useful for repeating strings to a certain length. string + repeat(string, number-1) : ""; @Fering main reason so that this way is O(log N) average rather than O(N) always. This operator works by multiplying a string by a number, which results in the string being repeated that many times. He has over 4 years of experience with Python programming language. Is there an equivalent of the Harvard sentences for Japanese? Can a creature that "loses indestructible until end of turn" gain indestructible later that turn? String repeat() - Repeat string N times in Java - HowToDoInJava In this we just multiply the string till it becomes greater than or equal to K, and then just omit the slice of extra string using the list slicing method. Have you ever tried using the operator '*' with a string? Repeat String to a Length With a User-Defined Function in Python, Check a String Is Empty in a Pythonic Way, Convert a String to Variable Name in Python, Remove Whitespace From a String in Python. When using Counter in Python how would I change the number of occurrences in a dictionary from numbers to asterisks(*)? English abbreviation : they're or they're not. What would naval warfare look like if Dreadnaughts never came to be? Which is given by the integer value " n " and creates a new string value. A basic loop includes the following operations: Take a look at the image below to understand how a basic loop works: Now, that you've familiarized yourself with loops, let's move on to the loop offered by Python to iterate n times. This is the approach I would take but why do more checks than is needed? Also would your first solution leave space after printing Hello for the second time? It continues to execute until a given condition is met. "Fleischessende" in German news - Meat-eating people? If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. The output of the program is: In conclusion, there are several ways to repeat a string N times in Python. Your email address will not be published. I'm looking for a simple commons method or operator that allows me to repeat some string n times. This will fail if we separate using '\' Check this : @RushabhPatel This is because '\' is not a valid string, use '\\' instead or r'\', @martineau You are right, then it should have been '\\', Display (print) string multiple times (repeatedly), Improving time to first byte: Q&A with Dana Lawson of Netlify, What its like to be on the Python Steering Council (Ep. Print the original list using the print () function. Is there a word in English to describe instances where a melody is sung by multiple singers/voices? But if were going to repeat a string to a certain length, we have to write our implementation. How can the language or tooling notify the user of infinite loops? Python | Check if string repeats itself - GeeksforGeeks This results in the string being repeated three times, and the output of the program is: Another way to repeat a string N times in Python is to use the join() method. repeat string javascript Create NSString by repeating another string a given number of times Edited I try to avoid for loops when they are not completely necessary because: They add to the number of lines of code even if they are tucked away in another function. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Recursion is a technique for iterating over an operation by having a function call itself repeatedly until it arrives at a result. The code example below shows how to use the * operator to repeat a string n times. Who counts as pupils or as a student in Germany? In this quick tutorial, youll learn how to repeat string in JavaScript with an without using built in methods. Pass the error (return null), 2. Is there a word for when someone stops being talented? How to Repeat a String Multiple Times in Python - Finxter This should really be marked as the answer. Hence, with an array like -> array = [1, 2, 3, 4] , the result of repeating the array 1 time will be -> [1, 1, 2, 2, 3, 3, 4, 4]. The '*' operator is also known as the repetition operator. command-line bash text-manipulation Share Improve this question Python | Repeat each element K times in list - GeeksforGeeks In this tutorial, we are going to learn about how to repeat a string n (number) of times in Python. Recursive concatenation log2 invocations (~3x). Home Python Repeat String N Times in Python. An advantage to using string formatting is that you're not limited just to repetition, though you can do it easily enough. How can kaiju exist in nature and not significantly alter civilization? A for loop repeats a sequence until a condition is met. But Python offers modules like NumPy and pandas, which have their own repeat() function. return number > 0 ? I cannot use loops, i must only use recursion It supports programming capabilities such as inheritance and polymorphism. Note that we've actually depicted how value is counted rather than repeating the same code n times. Create NSString by repeating another string a given number of times. but Does this definition of an epimorphism work? Sometimes you may need to repeat a string multiple times in Python. Making statements based on opinion; back them up with references or personal experience. Python is a popular programming language that is widely used for a variety of applications. So far we've discussed repeat() functions in Python.