[issue4016] improve linecache: reuse tokenize.detect_encoding() and io.open()

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

I had to revert this because tokenize imports itertools. This is a
problem when building (setup.py) because itertools doesn't exist, yet. I
also think we should consider hard adding more modules that are loaded
at startup time to py3k already huge list.

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resolution: accepted -> 
status: closed -> open

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