Find number of columns in csv file

Question

My program needs to read csv files which may have 1,2 or 3 columns, and it needs to modify its behaviour accordingly. Is there a simple way to check the number of columns withou

Answer 1

I would rebuild it as follows ( if the file is not too big ):

import csv
f = 'testfile.csv'
d = '\t'

reader = list(csv.reader(f,delimiter=d))
fields = len( reader[0] )
for row in reader:
    if fields == 1:
        pass
    elif fields == 2:
        pass
    elif fields == 3:
        pass
    else:
        raise CSVError("Too many columns in input file.")