'Set angle measurement units to degrees.
Optional argument:
fullcircle -  a number
Set angle measurement units, i. e. set number
of \'degrees\' for a full circle. Dafault value is
360 degrees.
Example (for a Turtle instance named turtle):
>>> turtle.left(90)
>>> turtle.heading()
90
Change angle measurement unit to grad (also known as gon,
grade, or gradian and equals 1/100-th of the right angle.)
>>> turtle.degrees(400.0)
>>> turtle.heading()
100'

def degrees(self, fullcircle=360.0):

    self._setDegreesPerAU(fullcircle)
