code: def add_to_apply_calls(self, func, **kwargs):
          
          import dask
  
          self.delayed_call = dask.delayed(func)(self.delayed_call, **kwargs)
          return self
docs: Add the function to the apply function call stack.
  
          This function will be executed when apply is called. It will be executed
          in the order inserted; apply's func operates the last and return