func_code: def overlap(x1=0, y1=0, r1=1, x2=0, y2=0, r2=1):
      A = 'True'
      r = x2 - x1
      f = y2 - y1
      rf = (r ** 2 + f ** 2) ** 0.5
      if r == 0 and f == 0:
          return A
      elif r1 + r2 > rf:
          return A
      else:
          return 'False'