[issue20703] RuntimeError caused by lazy imports in pdb

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Having a side effect at import time is not good. It will interfere with programs which just import pdb, but not use it.

There are two other options:

1. Import readline at top level, but call set_completer_delims() lazily.

2. Do not import readline at all. Call set_completer_delims() only if readline is already imported (sys.modules.get('readline') is not None).

I prefer the latter one.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue20703>
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