Computer Science – 20.2 File Processing and Exception Handling | e-Consult

Model Answer 1

This solution demonstrates how to read a file, process the content (counting words), and write the results to another file. It includes error handling for file existence.

import re

def processfile(inputfilename, output_filename):

try:

with open(input_filename, 'r', encoding='utf-8') as infile:

text = infile.read()

except FileNotFoundError:

print(f"Error: File '{input_filename}' not found.")

return

words = re.findall(r'\b\w+\b', text.lower()) # Extract words, convert to lowercase

word_counts = {}

for word in words:

wordcounts[word] = wordcounts.get(word, 0) + 1

try:

with open(output_filename, 'w', encoding='utf-8') as outfile:

for word, count in word_counts.items():

outfile.write(f"{word}: {count}\n")

except Exception as e:

print(f"Error writing to file '{output_filename}': {e}")

if name == "main":

input_file = "data.txt"

outputfile = "wordcounts.txt"

processfile(inputfile, output_file)

Explanation:

• The code first attempts to open the input file. If the file is not found, it prints an error message and exits.
• It reads the entire content of the file into a string.
• The re.findall() function is used with a regular expression to extract all words from the text, converting them to lowercase for case-insensitive counting.
• A dictionary word_counts is used to store the count of each word.
• The code then iterates through the word_counts dictionary and writes each word and its count to the output file.
• Error handling is included for potential issues during file writing.