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-rw-r--r--Lib/dbm/dumb.py17
1 files changed, 17 insertions, 0 deletions
diff --git a/Lib/dbm/dumb.py b/Lib/dbm/dumb.py
index e6d650515a..2296dbfd54 100644
--- a/Lib/dbm/dumb.py
+++ b/Lib/dbm/dumb.py
@@ -81,6 +81,11 @@ class _Database(collections.MutableMapping):
try:
f = _io.open(self._datfile, 'r', encoding="Latin-1")
except OSError:
+ if flag not in ('c', 'n'):
+ import warnings
+ warnings.warn("The database file is missing, the "
+ "semantics of the 'c' flag will be used.",
+ DeprecationWarning, stacklevel=4)
with _io.open(self._datfile, 'w', encoding="Latin-1") as f:
self._chmod(self._datfile)
else:
@@ -180,6 +185,10 @@ class _Database(collections.MutableMapping):
f.write("%r, %r\n" % (key.decode("Latin-1"), pos_and_siz_pair))
def __setitem__(self, key, val):
+ if self._readonly:
+ import warnings
+ warnings.warn('The database is opened for reading only',
+ DeprecationWarning, stacklevel=2)
if isinstance(key, str):
key = key.encode('utf-8')
elif not isinstance(key, (bytes, bytearray)):
@@ -215,6 +224,10 @@ class _Database(collections.MutableMapping):
# (so that _commit() never gets called).
def __delitem__(self, key):
+ if self._readonly:
+ import warnings
+ warnings.warn('The database is opened for reading only',
+ DeprecationWarning, stacklevel=2)
if isinstance(key, str):
key = key.encode('utf-8')
self._verify_open()
@@ -304,4 +317,8 @@ def open(file, flag='c', mode=0o666):
else:
# Turn off any bits that are set in the umask
mode = mode & (~um)
+ if flag not in ('r', 'w', 'c', 'n'):
+ import warnings
+ warnings.warn("Flag must be one of 'r', 'w', 'c', or 'n'",
+ DeprecationWarning, stacklevel=2)
return _Database(file, mode, flag=flag)