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继承 Python 的 cmd.Cmd 类实现的命令行程序，能实现自动补全功能吗？
source link: https://www.v2ex.com/t/779434
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文档中有如下内容：
class cmd.Cmd(completekey='tab', stdin=None, stdout=None)
Cmd.completedefault(text, line, begidx, endidx)
Method called to complete an input line when no command-specific complete_*() method is available. By default, it returns an empty list.
按照理解，输入命令的时候按 Tab 键应该能自动补全，，可是我试了下就在本行添加了空格，，并没有补全行为，，也没有调用覆写的 completedefault 方法，，哪位知道是什么原因？
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