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Diffstat (limited to 'Doc/library/dbm.rst')
| -rw-r--r-- | Doc/library/dbm.rst | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/Doc/library/dbm.rst b/Doc/library/dbm.rst index 32e80b2..1abc36c 100644 --- a/Doc/library/dbm.rst +++ b/Doc/library/dbm.rst @@ -339,9 +339,23 @@ The module defines the following: dumbdbm database is created, files with :file:`.dat` and :file:`.dir` extensions are created. - The optional *flag* argument supports only the semantics of ``'c'`` - and ``'n'`` values. Other values will default to database being always - opened for update, and will be created if it does not exist. + The optional *flag* argument can be: + + +---------+-------------------------------------------+ + | Value | Meaning | + +=========+===========================================+ + | ``'r'`` | Open existing database for reading only | + | | (default) | + +---------+-------------------------------------------+ + | ``'w'`` | Open existing database for reading and | + | | writing | + +---------+-------------------------------------------+ + | ``'c'`` | Open database for reading and writing, | + | | creating it if it doesn't exist | + +---------+-------------------------------------------+ + | ``'n'`` | Always create a new, empty database, open | + | | for reading and writing | + +---------+-------------------------------------------+ The optional *mode* argument is the Unix mode of the file, used only when the database has to be created. It defaults to octal ``0o666`` (and will be modified @@ -351,9 +365,10 @@ The module defines the following: :func:`.open` always creates a new database when the flag has the value ``'n'``. - .. deprecated-removed:: 3.6 3.8 - Creating database in ``'r'`` and ``'w'`` modes. Modifying database in - ``'r'`` mode. + .. versionchanged:: 3.8 + A database opened with flags ``'r'`` is now read-only. Opening with + flags ``'r'`` and ``'w'`` no longer creates a database if it does not + exist. In addition to the methods provided by the :class:`collections.abc.MutableMapping` class, :class:`dumbdbm` objects |