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+if __name__ == '__main__':
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+ str = "www.moe.gov.cn"
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+
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+print("例3：")
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+print(str[0])
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+print(str[0:3])
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+print(str[-3:])
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+print(len(str))
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+print(str.replace('.', '-'))
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+
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+print("\n例2：")
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+money = int(input('请输入你的钱数：'))
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+fifty = money // 50 # 整除50
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+five = money % 50 // 5 # 整除50后的余数再整除5
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+one = money % 50 % 5 // 1 # 整除50后的余数再整除5后的余数再整除1
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+print('换钱方案：' + repr(fifty) + '张50元，' + repr(five) + '张5元钱，和' + repr(one) + '张1元钱')
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