reading a txt. file into a 2D list in python - Stack Overflow I'm trying to read a blank 10x10 .txt file (that contains few '*') into a 10x10 2D list (called grid) but I'm not getting anywhere. Morse theory on outer space via the lengths of finitely many conjugacy classes. Why did Indiana Jones contradict himself? I get it that fortran and python are different! Convert string representation of list to list. Find centralized, trusted content and collaborate around the technologies you use most. How import data from a text file into 2D list in Python? The problem could be that the file's columns aren't actually separated by tabs, but instead by multiple spaces (and, in fact, the "text file format" you posted does not use tabs). Asking for help, clarification, or responding to other answers. Since your file is full of numbers, I'd suggest using numpy : >>> import numpy as np To learn more, see our tips on writing great answers. 587), The Overflow #185: The hardest part of software is requirements, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Testing native, sponsored banner ads on Stack Overflow (starting July 6). Characters with only one possible next character. Thanks for contributing an answer to Stack Overflow! rev2023.7.7.43526. Help me out from This means you dont have to generate data over again when How much space did the 68000 registers take up? Python: loading txt file into 2d list of different types Can I still have hopes for an offer as a software developer, Customizing a Basic List of Figures Display, Book set in a near-future climate dystopia in which adults have been banished to deserts. Using open ('filename', 'r') (the r means read) you can loop over all the lines in the code with a simple for loop. What could cause the Nikon D7500 display to look like a cartoon/colour blocking? Characters with only one possible next character. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why do keywords have to be reserved words? (Ep. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 587), The Overflow #185: The hardest part of software is requirements, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Testing native, sponsored banner ads on Stack Overflow (starting July 6), Using python to read a list in a txt file, Import a txt file into a 2d list of floats, Reading a text file into a 2d list in Python, without deleting spaces, Python: loading txt file into 2d list of different types. 587), The Overflow #185: The hardest part of software is requirements, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Testing native, sponsored banner ads on Stack Overflow (starting July 6). How to read from a file and construct a two-dimensional array? Would a room-sized coil used for inductive coupling and wireless energy transfer be feasible? How to play the "Ped" symbol when there's no corresponding release symbol. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. contains spaces instead of tab characters), you can parse it simply by using indices to slice the first 10 characters (as the keys in your dictionary) and 11th character onwards (as the values). python - Read 2d list from txt file fast in python3 - Stack Overflow Book set in a near-future climate dystopia in which adults have been banished to deserts. 15amp 120v adaptor plug for old 6-20 250v receptacle? So in order for the changes to stick you need to make assignments. a 2 dimensional list. Invitation to help writing and submitting papers -- how does this scam work? it copies the list) and selects the second element. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Non-definability of graph 3-colorability in first-order logic, Using Lin Reg parameters without Original Dataset. critical chance, does it have any reason to exist? data = [map(int, line.split()) for line in f] By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In the movie Looper, why do assassins in the future use inaccurate weapons such as blunderbuss? Customizing a Basic List of Figures Display. Do I remove the screw keeper on a self-grounding outlet? Not the answer you're looking for? I don't mean anything in favour csv module or against opening files with built-in functions and splitting rows with split(','). A+B and AB are nilpotent matrices, are A and B nilpotent? How should I select appropriate capacitors to ensure compliance with IEC/EN 61000-4-2:2009 and IEC/EN 61000-4-5:2014 standards for my device? I suggest using numpy.array or Matrix. So, here is my code so far: so I expect the command print(data[:][1]) to print all rows for column 2. rev2023.7.7.43526. To learn more, see our tips on writing great answers. rev2023.7.7.43526. line.split('\t') returns a list, and line.split('\t')[0] returns the first element of that list ('apple', 'orange', 'banana'). Making statements based on opinion; back them up with references or personal experience. I'm trying to read data from an existed text file, then I want to print it as a triangle shape. rev2023.7.7.43526. You may want to upvote the answers you found useful, and select one of them as your answer via the checkmark. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. In conclusion, what I'm trying to do here is to read each line from the text file then split each number and put it in a matrix. >>> data = np.loadtxt(f, delimiter=" Python: way to read data from multiple files into 2D numpy array Spying on a smartphone remotely by the authorities: feasibility and operation. But avoid . Is there a distinction between the diminutive suffices -l and -chen? Do I have the right to limit a background check? It works fine, I get your point, but even with readline the issue remains. Were Patton's and/or other generals' vehicles prominently flagged with stars (and if so, why)? Is there a legal way for a country to gain territory from another through a referendum? Connect and share knowledge within a single location that is structured and easy to search. simply use the python package csv, and then doing. n = int(input()) List comprehension usually makes your script faster but sometimes harder for readability. First, I opened the text file then read it and stored it in a list: Next, I have tried to split each number by itself so I can store it in a two-dimensional list: Asking for help, clarification, or responding to other answers. First, I opened the text file then read it and stored it in a list: file1 = open ("distance_matrix.txt", "r") contents1 = file1.readlines () Next, I have tried to split each Thanks all for your suggestions and help! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How to passive amplify signal from outside to inside? Not the answer you're looking for? 2 seconds). How import data from a text file into 2D list in Python? Python zip magic for classes instead of tuples. # [[1, 3, 4], Can we use work equation to derive Ohm's law? Brute force open problems in graph theory. You can make a versatile code using the built-in module glob and numpy.genfromtxt, as shown in the example below where the second line of many test*.txt files will build one 2 Connect and share knowledge within a single location that is structured and easy to search. In order to successfully terminate with an 999x999 array as input, the c program takes about 5 seconds, while the python one takes a lot more than 10. We open the file in reading mode, then read all the text using the read () and store it into a variable called data. why isn't the aleph fixed point the largest cardinal number? Ok thanks for clarifying that for me. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Were Patton's and/or other generals' vehicles prominently flagged with stars (and if so, why)? What is the number of ways to spell French word chrysanthme ? The neuroscientist says "Baby approved!" Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Travelling from Frankfurt airport to Mainz with lot of luggage. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Use a context manager to handle the file. file into a 2D list in python, Why on earth are people paying for digital real estate? Why did Indiana Jones contradict himself? Input data from file to 2D array in python, HOW TO READ LINE FROM A TEXT FILE INTO AN 2D ARRAY IN PYTHON. My manager warned me about absences on short notice. Python zip magic for classes instead of tuples. rev2023.7.7.43526. I am assuming there is a 6complex.txt file that contains a few * where if you find a star you will append it to the 2D grid else that position of the grid will have a blank space. How to read a text file and store it in a two-dimensional Countering the Forcecage spell with reactions? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Languages which give you access to the AST to modify during compilation? The neuroscientist says "Baby approved!" Sci-Fi Science: Ramifications of Photon-to-Axion Conversion. tangy and juicy, very healthy) have two spaces in a row in them, you can replace. Since the algorithm is effectively the same, my next thought is that my way of passing data from the file into a 2d list in python is to blame. Is there any potential negative effect of adding something to the PATH variable that is not yet installed on the system? What is the number of ways to spell French word chrysanthme ? How to read from a file and construct a two-dimensional array? Reading 2d array from a file into python list - Stack Overflow rev2023.7.7.43526. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. To learn more, see our tips on writing great answers. print [[int(s) for s in line.split()] for line in txt.splitlines()] 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. result = [[int(x) for x in line.split()] for line in file] More about eval: you can do the following, this solution uses the re library where you can read more about it in here: which will give you the following output: Now every line is stored in the array as you want, arr[pos_i][pos_j]. I am trying to read a 2d array of comma separated values from a file into a list. How to Read Text File Into List in Python? - GeeksforGeeks I am assuming there is a 6complex.txt file that contains a few * where if you find a star you will append it to the 2D grid else that position of the grid will Were Patton's and/or other generals' vehicles prominently flagged with stars (and if so, why)? How to read a text file and store it in a two-dimensional list Using Python? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, No here in this case they are not fixed width. No here the text file has two columns and they are separated by tab. python - How to write 2d list to a file? - Stack Overflow Travelling from Frankfurt airport to Mainz with lot of luggage, Cultural identity in an Multi-cultural empire. Do I remove the screw keeper on a self-grounding outlet? What is the significance of Headband of Intellect et al setting the stat to 19? Also, variable and function names should follow the. 5 5 6''' One-liner time: [line.split() for line in ins] I tried the following code to change it to two lists and then convert it into a dictionary: I am getting some incorrect values. Making statements based on opinion; back them up with references or personal experience. How to efficiently parse fixed width files? What is the number of ways to spell French word chrysanthme ? 1 Answer. How does the theory of evolution make it less likely that the world is designed? Trying to read information in a file into two lists in Python, Converting .txt data into two lists in Python. English equivalent for the Arabic saying: "A hungry man can't enjoy the beauty of the sunset". Here is an example from the official docs: Convert each row into a list, and then add them to another list to get your matrix: You can use csv and a list comprehension: Your question implies that you want to access the data using a tuple data[0,1] vs a multidimensional list that you would use the syntax of data[0][1]. To learn more, see our tips on writing great answers. Invitation to help writing and submitting papers -- how does this scam work? 587), The Overflow #185: The hardest part of software is requirements, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Testing native, sponsored banner ads on Stack Overflow (starting July 6), How to read a text file into a list or an array with Python, Reading a text file into a 2d list in Python, without deleting spaces, convert a text from a file to a list of strings in python, Reading a text file into a 2D array in Python, Read and convert row in text file into list of string, Read a text file line-by-line into a string with python. (Ep. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to read lines from a CSV variable into a multidimensional array in python? Cannot assign Ctrl+Alt+Up/Down to apps, Ubuntu holds these shortcuts to itself. How to passive amplify signal from outside to inside? 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. 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.