diff options
Diffstat (limited to 'Lib/dbm/dumb.py')
| -rw-r--r-- | Lib/dbm/dumb.py | 17 |
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) |