Append a new row to the existing CSV file using Dictwriter
Let’s see how to use DictWriter class to append a dictionary as a new row into an existing CSV file.
- Open your CSV file in append mode Create a file object for this file.
- Pass the file object and a list of column names to DictWriter() You will get an object of DictWriter.
- Pass the dictionary as an argument to the writerow() function of DictWriter (it will add a new row to the CSV file).
- Close the file object
Python3
# Import DictWriter class from CSV module from csv import DictWriter # list of column names field_names = [ 'ID' , 'NAME' , 'RANK' , 'ARTICLE' , 'COUNTRY' ] # Dictionary that we want to add as a new row dict = { 'ID' : 6 , 'NAME' : 'William' , 'RANK' : 5532 , 'ARTICLE' : 1 , 'COUNTRY' : 'UAE' } # Open CSV file in append mode # Create a file object for this file with open ( 'event.csv' , 'a' ) as f_object: # Pass the file object and a list # of column names to DictWriter() # You will get a object of DictWriter dictwriter_object = DictWriter(f_object, fieldnames = field_names) # Pass the dictionary as an argument to the Writerow() dictwriter_object.writerow( dict ) # Close the file object f_object.close() |
Output:
How to append a new row to an existing csv file?
For writing a CSV file, the CSV module provides two different classes writer and Dictwriter. Here we will discuss 2 ways to perform this task effectively. The First will be ‘append a list as a new row to the existing CSV file‘ and second way is ‘Append a dictionary as a new row to the existing CSV file.’
First, let’s have a look at our existing CSV file contents.