Python dictreader KeyError issue

Question

I am getting a keyerror when trying to read data from a csv. Below is the code that writes to the csv, followed by the code that reads from it. Python 2.7 on Ubuntu. Any help is appreciated!

    #setting up the csv
with open(databaseLocal, 'wb') as csvfile:
        fieldnames = ['cpu', 'pid', 'memory']
        writer = csv.DictWriter(csvfile, fieldnames=fieldnames, 
            quotechar='|', quoting=csv.QUOTE_MINIMAL)
        writer.writeheader()

#Here is one spot where it's written to...
if data[:6] == 'active':
                print 'mem info received'
                memInfo = data[7:-1]

                writer.writerow({'cpu': '_', 'pid': pidValue, 'memory': memInfo})

#and here is where it's read from, there is a KeyError for the line
#where we try to get row['pid]
with open(d, 'rb') as csvfile:
        reader = csv.DictReader(csvfile, delimiter=' ', quotechar='|')
        for row in reader:
            print row['pid']
            print row.keys() 

When I just print 'row.keys()' all three of the keys show up. Not sure why I can't access 'row['pid'] or any of the others.

Thanks! Matt

Answer 1

You are writing to databaseLocal , but trying to read from d . Are you sure they are referencing the same file?