问问题
290 次
1 回答
1
Reposting as an answer for completeness:
There was a file called cmd.py somewhere where Python was finding it as an importable module. This was shadowing the cmd module in the standard library, which is used by pdb, which IPython imports. When pdb tried to subclass a class from cmd, that class wasn't there. Moving cmd.py out of the way lets it find the cmd module it needs.
This is an unfortunate annoyance with Python - lots of short words are already used as module names, and using them yourself produces crashes, with a wide range of different errors.
于 2017-04-23T12:26:56.653 回答