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expected str instance, NoneType found

# cause of error
','.join([None])    # something along these lines

# solution 1 (convert None in list to string)
','.join(map(str,[None])) 

# solution (filter None from a list)
 ','.join(filter(None, ['a', None, 'c']))  # removes None or 'Falsey' from Array

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expected str instance, NoneType found

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