How to Reset a CSV DictReader in Python?

The csv.DictReader object in Python’s csv module does not have a built-in method to reset itself. However, you can achieve a similar effect by reopening the CSV file or by using the seek() method on the underlying file object. Here’s an example using the seek() method:

import csv

# Open the CSV file
csv_file = open('data.csv', 'r')

# Create the DictReader object
reader = csv.DictReader(csv_file)

# Read and process the CSV data
for row in reader:
    # Process the row

# Reset the reader by resetting the file position
csv_file.seek(0)

# Read and process the CSV data again (reset)
for row in reader:
    # Process the row

# Close the CSV file
csv_file.close()

In this example, the csv_file is opened in read mode, and the DictReader object reader is created based on the file. The first iteration over the reader processes the CSV data.

To reset the reader and read the CSV data again, the seek(0) method is called on the csv_file object. The seek(0) method sets the file position back to the beginning of the file, effectively resetting the reader.

After resetting, you can iterate over the reader again to process the CSV data from the start.

Remember to close the CSV file after you’re done with it using the close() method to release any system resources associated with it.

Alternatively, if you need to reset the DictReader object without reopening the file, you can create a new DictReader object based on the same file object or reload the file into memory as a list and create a new DictReader object using that list.