@ -25,3 +25,15 @@ class Shelf:
def get_color(self):
return self.color
def levels(self):
r = ''
str = [0, 0, 0]
if len(self.level1) > 0:
str[0] = 1
if len(self.level2) > 0:
str[1] = 1
str[2] = 1
r.join(str)
return r
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