题目内容
Correct the following codes to print 9.改正下列代码输出9.x = 0def func():print(x)x = 9func()
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There is an error when running the following codes,NameError: name 'r' is not defined. Please correct the error.下列代码运行时错误提示NameError: name 'r' is not defined，请改正其中的错误。import mathclass Circle:def __init__(self, r):self.r = rdef area(self):return math.pi*r*rc = Circle(2)print(c.area())
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