TypeError: 'NoneType' object is not iterable in Python -

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what error typeerror: 'nonetype' object not iterable mean?

i getting on python code:

def write_file(data,filename):   #creates file , writes list   open(filename,'wb') outfile:     writer=csv.writer(outfile)     row in data:             ##above error thrown here       writer.writerow(row)

it means "data" none.


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