Python: skip comment lines marked with # in csv.DictReader

Question

Processing CSV files with csv.DictReader is great - but I have CSV files with comment lines in (indicated by a hash at the start of a line), for example:

# step s         


        

Answer 1

Just posting the bugfix from @sigvaldm's solution.

def decomment(csvfile):
for row in csvfile:
    raw = row.split('#')[0].strip()
    if raw: yield row

with open('dummy.csv') as csvfile:
    reader = csv.reader(decomment(csvfile))
    for row in reader:
        print(row)

A CSV line can contain "#" characters in quoted strings and is perfectly valid. The previous solution was cutting off strings containing '#' characters.