Python: How to check if cell in CSV file is empty?

You could use try and except.

for row in csvreader:
        try:
               #your code for cells which aren't empty
        except:
               #your code for empty cells

with open('testdata1.csv', 'r') as csvfile:
    csvreader = csv.reader(csvfile)
    for row in csvreader:
        print(row)
        if not row[0]:
             print("12")

Reference: How do I detect missing fields in a CSV file in a Pythonic way?