file-handling

问题 What is the best way to create/write/update a file in remote HDFS from local python script? I am able to list files and directories but writing seems to be a problem. I have searched hdfs and snakebite but none of them give a clean way to do this. 回答1: try HDFS liberary.. its really good You can use write(). https://hdfscli.readthedocs.io/en/latest/api.html#hdfs.client.Client.write Example: to create connection: from hdfs import InsecureClient client = InsecureClient('http://host:port', user=

问题 I have an assignment to create a menu program that uses a linked list to store a list of phone catalog. Here is my source code: int isempty(FILE *in) { return in == NULL; } node *makenewnode(item newitem) { node *newnode = (node *) malloc(sizeof(node)); newnode->info = newitem; return newnode; } int countlines(FILE *datain) { int lines = 0; char string[MAX]; while (fgets(string, MAX, datain)) lines++; return lines; } node *push(node *listin, item newitem) { node *newnode = makenewnode(newitem

问题 I have an assignment to create a menu program that uses a linked list to store a list of phone catalog. Here is my source code: int isempty(FILE *in) { return in == NULL; } node *makenewnode(item newitem) { node *newnode = (node *) malloc(sizeof(node)); newnode->info = newitem; return newnode; } int countlines(FILE *datain) { int lines = 0; char string[MAX]; while (fgets(string, MAX, datain)) lines++; return lines; } node *push(node *listin, item newitem) { node *newnode = makenewnode(newitem

问题 I am working on a project and I want to display the contents of a .txt file on the CMD window. I wrote this piece of code to open a demo.txt file on cmd but it does not work. The "path" variable contains the location where the demo.txt file is placed (as you can see obviously). public static void main(String[] args){ try{ String path = "C:\\Users\\Hp\\Documents\\NetBeansProject\\Project\\build\\classes\\"; //cmd command to open open the txt file on cmd window String command = ("type " + path

问题 I want to create a text file with mulitple lines using system calls in C and populate it with the text provided as command line arguments. This is what I wrote: #include <stdio.h> #include <fcntl.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #define MAX_SZ 1024 int main(int argc, char *argv[]) { if (argc != 3) { printf("Invalid Number of arguments\n"); printf("USAGE: ./a.out file_name \"msg\"\n"); } else { int fd_creat, fd_open, fd_write; char file_name[MAX_SZ]; char *msg =

问题 This question already has answers here : How to determine the delimiter in CSV file (5 answers) Closed 1 year ago . I saw that this question was already asked several times but they're on other language and I can't get a grasp on the answers. I am receiving a .csv or .txt file through a socket. Is there any way I can detect the delimiter or "splitter" of a line in the CSV or TXT file? This is the server code that handles the file writing, try{ final ServerSocket server = new ServerSocket(8998

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 12 months ago . Improve this question I have a textfile with these following numbers and characters inside of it. 36@xL!?\8 28?>\4 42<pX%7 37@#5 31kL%^?>\<#%5 Now, i want to get the first integer which is 36 and subtract it on the last integer which is 8. I want to do this line by line. 回答1:

问题 Well i made this script that its supouse to logg some keystrokes for a while save them in a file and then erase the file if the user want to however when the script tryes to delete the file i get this error. Traceback (most recent call last):File "C:\Users\Tormentor\Desktop\S.D.A.K.L\pregunta.py", line 34, in os.remove(path2+"\"+name) PermissionError: [WinError 32] The process cannot access the file because it is being used by another process:'C:\Users\Public\myfile.txt' I made some research

问题 This question already has answers here : How to open every file in a folder (6 answers) Closed 23 days ago . I have looked at multiple questions & answers across SO, as well as other platforms pertaining to reading text files in a folder, but unfortunately none seems to work for me at the moment. I have multiple text files in a folder and would like to read them all, and put each text file as a string into a new list new_list . path = "MyNews_AccidentDataset/News_txt.txt" all_files = os

问题 I'm trying to learn python 3. I was going through the exercises of File Handling. I'm having an issue with my code, when i try to write a file, it doesn't make any file sometimes and sometimes a file is generated but when i try to read it. It shows blank output. Most of time it give some sort of syntax error, while i'm using the basics and simple code. But sometime instead of using run in terminal, when i click on run code, it produces the output but still gives error on terminal. I've tried