Antoine Pitrou added the comment:
The environ class could have its own lock and then the __iter__ method could be
rewritten as follows:
def __iter__(self):
with self._lock:
keys = list(self._data)
for key in keys:
yield self.decodekey(key)
----------
nosy: +pitrou
versions: +Python 3.7
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<http://bugs.python.org/issue30441>
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