str = input("请输入一段字符串,回车结束:\n")for i in range(len(str)): #遍历字符串中每个字符# 利用ASCII码确定大小写;也可以用:if ord(str[i]) >= 65 and ord(str[i]) <= 90:if str[i] >= "A" and str[i] <= "Z" :# 利用ASCII码转换大小写;ord()获取ASCII码值;chr()通过ASCII码值得到字符;print(chr(ord(str[i])+32),end="")elif str[i] >= "a" and str[i] <= "z":print(chr(ord(str[i])-32),end="")else:print(str[i],end="")
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