Terry J. Reedy added the comment:

See #20338 for why I think 70 (or even 79, the limit in CallTipWindow) is too 
low a limit.

The purpose of grabbing multiple lines is to get the signature lines of 
builtins. I believe the max number of lines needed is 5, for bytes. however, 
identifying likely builtins by the absence of a signature from inspect, which 
works now, will not work when Clinic and inspect start giving us such. Even 
when if Clinic produces a signature string for bytes, it will probably be 
opaque and the doc lines would still be helpful. So I think we can try up to 5 
lines from the docstring for any object. I am working on a revision of the 
patch.

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assignee: serhiy.storchaka -> terry.reedy

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<http://bugs.python.org/issue16638>
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