Write a Python program to read 5 random lines from file A.txt and then write them to file B.txt.

Sure! Here's a Python program that reads 5 random lines from file A.txt and writes them to file B.txt:

import random

# Read the lines from file A.txt
with open('A.txt', 'r') as file:
    lines = file.readlines()

# Choose 5 random lines
random_lines = random.sample(lines, 5)

# Write the random lines to file B.txt
with open('B.txt', 'w') as file:
    file.writelines(random_lines)

相关问题

Write a program to read the file Harry_Potter.txt and count the number of words in this file. Then, create and write the number of words in another .txt file named 'Count_Words' (You do not have to submit the file you generate.) Download the Harry Potter.txt file.

Here is a Python program that reads the file 'Harry_Potter.txt', counts the number of words in it, and writes the count to a new file 'Count_Words.txt':

# open the Harry Potter text file
with open('Harry_Potter.txt', 'r') as file:
    # read the contents of the file
    text = file.read()
    # split the text into words
    words = text.split()
    # count the number of words
    num_words = len(words)

# create a new file and write the number of words
with open('Count_Words.txt', 'w') as file:
    file.write(str(num_words))

This program first opens the 'Harry_Potter.txt' file and reads its contents into a variable called `text`. It then splits the text into individual words using the `split()` method and counts the number of words using the `len()` function.

Finally, the program creates a new file called 'Count_Words.txt' using the `open()` function with the `w` (write) mode. It writes the number of words to the file using the `write()` method, converting the integer to a string using the `str()` function.

Note that you need to make sure the 'Harry_Potter.txt' file is in the same directory as the Python program for this to work.

Modify C program to write the contents of the read file to another file instead of to stdout.

可以的，您可以将读取文件的内容写入另一个文件而不是标准输出。这可以通过使用fopen()打开新文件，然后使用fputc()将文件指针中的每个字符都写入该文件来完成。具体实现可以参考以下代码片段：

#include <stdio.h>

int main() {
   FILE *inputFile, *outputFile;
   int c;

   inputFile = fopen("input.txt", "r");
   outputFile = fopen("output.txt", "w");

   while ((c = fgetc(inputFile)) != EOF) {
      fputc(c, outputFile);
   }

   fclose(inputFile);
   fclose(outputFile);

   return 0;
}

这段代码将读取input.txt文件的内容并将其写入output.txt文件中。