parameters: (self, pfx)
return_statement: return True if pfx in self.prefixes else None
docstring: Lookup prefix (if any, None otherwise), by name
docstring_summary: Lookup prefix (if any, None otherwise), by name
docstring_tokens: Lookup prefix ( if any None otherwise ) by name
function: def lookupPrefix(self, pfx):
          """Lookup prefix (if any, None otherwise), by name"""
          return True if pfx in self.prefixes else None
function_tokens: def lookupPrefix ( self , pfx ) : return True if pfx in self . prefixes else None