02 2024 档案
摘要：a=input("Please input a number:")def test(num): try: return float(a) except ValueError: return "请输入数字"print(test(a))
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摘要：s="I am welcome you!"num=0for i in s: if i=='m': num+=1print(num)
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摘要：s="I am welcome you!"world="welcome"def function(): if world in s: return s.find(world) else: return -1print(function())
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摘要：x=input("please input a number：")if x==x[::-1]: print("是回文")else: print("不是回文")
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