None 不是 wrap 选项的有效值.您需要使用字符串 "none" 或 tkinter 变量 NONE.通过指定 python 值 None，您实际上是在请求默认值，即 "char"

None is not a valid value for the wrap option. You need to use the string "none" or the tkinter variable NONE. By specifying the python value None you are actually requesting the default value, which is "char"

chtext = Text(af, width=45, wrap="none", font=("Arial",12))