docs/examples/userguide/memoryviews/not_none.pyx


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import numpy as np

def process_buffer(int[:,:] input_view not None,
                   int[:,:] output_view=None):

   if output_view is None:
       # Creating a default view, e.g.
       output_view = np.empty_like(input_view)

   # process 'input_view' into 'output_view'
   return output_view