R. David Murray added the comment:
This issue may be about reducing the startup time, but this function is a hot
spot in the email package so I would prefer to sacrifice startup time
optimization for an increase in speed.
However, given the improvements to import locking in 3.3, what about a self
replacing function?
def _has_surrogates(s):
import email.utils
f = re.compile('[\udc80-\udcff]').search
email.utils._has_surrogates = f
return f(s)
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<http://bugs.python.org/issue11454>
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