Close #17702: On error, os.environb now removes suppress the except context
when raising a new KeyError with the original key.
diff --git a/Lib/os.py b/Lib/os.py
index 06616c6..87689cc 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -673,7 +673,7 @@
value = self._data[self.encodekey(key)]
except KeyError:
# raise KeyError with the original key value
- raise KeyError(key)
+ raise KeyError(key) from None
return self.decodevalue(value)
def __setitem__(self, key, value):
@@ -689,7 +689,7 @@
del self._data[encodedkey]
except KeyError:
# raise KeyError with the original key value
- raise KeyError(key)
+ raise KeyError(key) from None
def __iter__(self):
for key in self._data: