TypeError NoneType object is not iterable in Python

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What does this error mean? 

I get this error in this python code:

def write_file(data, filename): # creates file and writes list to it
  with open(filename, 'wb') as outfile:
    writer = csv.writer(outfile)
    for row in data: # ABOVE ERROR IS THROWN HERE
      writer.writerow(row)

Can someone help me with this?

May 5 in Python by Kichu
• 16,850 points
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