parameters: (self, vert)
return_statement: return self.pgon[pred]
docstring: return position of predecessor vertex
docstring_summary: return position of predecessor vertex
docstring_tokens: return position of predecessor vertex
function: def pred_v(self, vert):
  		"return position of predecessor vertex"
  		pred = self.pred_i(vert)
  		return self.pgon[pred]
function_tokens: def pred_v ( self , vert ) : pred = self . pred_i ( vert ) return self . pgon [ pred ]