[issue15758] FileIO.readall() has worst case O(n^2) complexity

[Roundup Robot]

Roundup Robot added the comment:

New changeset e4c303d23d01 by Richard Oudkerk in branch 'default':
Issue #15758: Fix FileIO.readall() so it no longer has O(n**2) complexity.
http://hg.python.org/cpython/rev/e4c303d23d01

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nosy: +python-dev

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