code: def array_to_csv(array_like):  # type: (np.array or Iterable or int or float) -> str
      
      stream = StringIO()
      np.savetxt(stream, array_like, delimiter=',', fmt='%s')
      return stream.getvalue()
docs: Convert an array like object to CSV.
  
      To understand better what an array like object is see:
      https://docs.scipy.org/doc/numpy/user/basics.creation.html#converting-python-array-like-objects-to-numpy-arrays
  
      Args:
          array_like (np.array or Iterable or int or float): array like object to be converted to CSV.
  
      Returns:
          (str): object serialized to CSV