How to Append a New Column to Multiple CSV Files and Align Entries with Corresponding Rows Using Python?

Appending a New Column to CSV Files

Initial Question:

Users desire to add a new column named "Berry" to multiple CSV files, aligning the entries with corresponding rows. The current Python script, however, skips lines and assigns only "Berry" to the new column.

Solution:

1. Obtain and Modify Headers:

   • Retrieve the first row (headers) using next() (Python 3):
   • Append the "Berry" header to indicate the new column.

2. Iterate and Modify Remaining Rows:

   • Loop through the remaining CSV lines using a reader object.
   • For each line, append the first column's value to the new "Berry" column.

Below is the modified Python script incorporating these changes:

<code class="python">import csv

with open('input.csv', 'r') as csvinput, open('output.csv', 'w', newline='') as csvoutput:
    writer = csv.writer(csvoutput)
    reader = csv.reader(csvinput)

    headers = next(reader)
    headers.append('Berry')
    writer.writerow(headers)

    for row in reader:
        row.append(row[0])
        writer.writerow(row)</code>

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