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TypeError: el objeto 'NoneType' no es iterable en Python
Que significa error TypeError: 'NoneType' object is not iterable ? Lo estoy obteniendo en este código de Python: 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)