class ShoppingCart: def __init__(self): self.items = [] def add_items(self, item): if item in items_price: self.items.append(item) print(f'{item}已添加到购物车') else: print(f'没有...

class School_number(): def __init__(self, name, age): self.name = name self.age = age def describe(self): print(f'我的名字是{self.name}，我的年龄是{self.age}') class Student(School...

练习1 def GetAge(age): try: if age <= 0: raise Exception('输入的年龄不符合要求') except ValueError: print('年龄必须大于0') raise GetAge(-1) 练习2 num_one = int(input('请输入被除...

选择题 try-except-else-finally练习 编写程序，按用户输人的半径计算圆的面积，若半径为负值则抛出异常