def renamecol(X, old, new):
NewNames = tuple([n if n != old else new for n in X.dtype.names])<EOL>X.dtype.names = NewNames<EOL>
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`.