def _get_key(self, element):

        try:
            key = hash(element)

        except:
            key = id(element)

        return key
Increment the line number of each node in the tree starting at *node* by *n*.
dataset/ETHPy150Open enthought/pyface/pyface/viewer/tree_viewer.py/TreeViewer._get_key--crossover with--dataset/ETHPy150Open kleientertainment/ds_mod_tools/pkg/win32/Python27/Lib/ast.py/increment_lineno