code: def append(self, data, itemsize=None):
          
  
          self.insert(len(self), data, itemsize)
docs: Append data to the end.
  
          Parameters
          ----------
  
          data : array_like
              An array, any object exposing the array interface, an object
              whose __array__ method returns an array, or any (nested) sequence.
  
          itemsize:  int or 1-D array
              If `itemsize is an integer, N, the array will be divided
              into elements of size N. If such partition is not possible,
              an error is raised.
  
              If `itemsize` is 1-D array, the array will be divided into
              elements whose succesive sizes will be picked from itemsize.
              If the sum of itemsize values is different from array size,
              an error is raised.