python長度轉換

s=input()if s[-1:] in ['m']:    s=eval(s[0:-1])*39.37    print("{:.3f}in".format(s))elif s[-2:] in ['in']:    s=eval(s[0:-2])/39.37    print("{:.3f}m".format(s))else:    print("輸入錯誤")

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