parameters: (self,runs)
return_statement: return None
docstring: Returns the intersecting extent for a set of runs, or None
          if there is none.
docstring_summary: Returns the intersecting extent for a set of runs, or None
          if there is none.
docstring_tokens: Returns the intersecting extent for a set of runs or None if there is none .
function: def intersects_runs(self,runs):
          """Returns the intersecting extent for a set of runs, or None
          if there is none."""
          for r in runs:
              v = self.intersects(r)
              if v: return v
          return None
function_tokens: def intersects_runs ( self , runs ) : for r in runs : v = self . intersects ( r ) if v : return v return None