parameters: (self, x, y=None)
return_statement: return abs(pos - self._position)
docstring: Return the distance from the turtle to (x,y) in turtle step units.
  
          Arguments:
          x -- a number   or  a pair/vector of numbers   or   a turtle instance
          y -- a number       None                            None
  
          call: distance(x, y)         # two coordinates
          --or: distance((x, y))       # a pair (tuple) of coordinates
          --or: distance(vec)          # e.g. as returned by pos()
          --or: distance(mypen)        # where mypen is another turtle
  
          Example (for a Turtle instance named turtle):
          >>> turtle.pos()
          (0.00, 0.00)
          >>> turtle.distance(30,40)
          50.0
          >>> pen = Turtle()
          >>> pen.forward(77)
          >>> turtle.distance(pen)
          77.0
docstring_summary: Return the distance from the turtle to (x,y) in turtle step units.
docstring_tokens: Return the distance from the turtle to ( x y ) in turtle step units .
function: def distance(self, x, y=None):
          """Return the distance from the turtle to (x,y) in turtle step units.
  
          Arguments:
          x -- a number   or  a pair/vector of numbers   or   a turtle instance
          y -- a number       None                            None
  
          call: distance(x, y)         # two coordinates
          --or: distance((x, y))       # a pair (tuple) of coordinates
          --or: distance(vec)          # e.g. as returned by pos()
          --or: distance(mypen)        # where mypen is another turtle
  
          Example (for a Turtle instance named turtle):
          >>> turtle.pos()
          (0.00, 0.00)
          >>> turtle.distance(30,40)
          50.0
          >>> pen = Turtle()
          >>> pen.forward(77)
          >>> turtle.distance(pen)
          77.0
          """
          if y is not None:
              pos = Vec2D(x, y)
          if isinstance(x, Vec2D):
              pos = x
          elif isinstance(x, tuple):
              pos = Vec2D(*x)
          elif isinstance(x, TNavigator):
              pos = x._position
          return abs(pos - self._position)
function_tokens: def distance ( self , x , y = None ) : if y is not None : pos = Vec2D ( x , y ) if isinstance ( x , Vec2D ) : pos = x elif isinstance ( x , tuple ) : pos = Vec2D ( * x ) elif isinstance ( x , TNavigator ) : pos = x . _position return abs ( pos - self . _position )