Python Programming with Raspberry Pi

Reading from CSV files

Let's discuss an example where we read the contents of the CSV file created in the previous section:

1. The first step in reading a CSV file is opening it in read mode:

       with open("csv_example.csv", 'r') as csv_file:

2. Next, we initialize an instance of the reader class from the CSV module. The contents of the CSV file are loaded into the object csv_reader:

       csv_reader = csv.reader(csv_file)

3. Now that the contents of the CSV file are loaded, each row of the CSV file could be retrieved as follows:

       for row in csv_reader:            print(row)

4. Put it all together:

       import csv        if __name__ == "__main__":           # initialize csv writer           with open("csv_example.csv", 'r') as csv_file:                 csv_reader = csv.reader(csv_file)  for row in csv_reader: ...