Question

I’m new to Python and am trying to make use of it to parse and manipulate data from a CSV file. In my script below there are portions of code that are not executing. However it seems to me that they should unless I am misunderstanding something pretty fundamental about Python syntax. Please see the comments in the code. I indicated using the comments what code is not firing. Can someone tell me what the problem might be?

import csv
import datetime

def uniqueify(file):
    checked = []
    reader = csv.reader(file)
    for row in reader:
        if row[1] not in checked:
            checked.append(row[1])
    return checked


f = open('d:/test.csv')
reader = csv.reader(f)
print "Parsed file is:", f.name

offers = uniqueify(f)

print "Offers", "|",
print "Channel", "|",

start = datetime.date(2011, 12, 01)
end = datetime.date(2012, 01, 31)
d = start
while (d<=end):
    print d, "|",
    d += datetime.timedelta(days=1)
print #force to new line

for o in offers:
    print o,"|", "DRTV","|"
    for row in reader:
#NOTHING INSIDE THIS FOR LOOP EXECUTES
        print row
        if row[1] == o:
            print "foo"
            date = datetime.date(row[0])
            padding = date - start
            print padding

#NOTHNG BELOW THIS LINE EXECUTES
for row in reader:
    print row
    print "foo"

Answer 1

Try adding a

f.seek(0)

after you call uniqueify(f). I think you’re exhausting the file object that is backing the CSV reader.