code: def renamecol(X, old, new):
      
      NewNames = tuple([n if n != old else new for n in X.dtype.names])
      X.dtype.names = NewNames
docs: Rename column of a numpy ndarray with structured dtype, in-place.
  
      Implemented by the tabarray method 
      :func:`tabular.tab.tabarray.renamecol`.
  
      **Parameters**
  
              **X** :  numpy ndarray with structured dtype
  
                      The numpy array for which a column is to be renamed.
  
              **old** :  string
  
                      Old column name, e.g. a name in `X.dtype.names`.
  
              **new** :  string
  
                      New column name to replace `old`.