This module provides an interface to the GNU DBM (GDBM) library.
This module is quite similar to the dbm module, but uses GDBM instead to
provide some additional functionality. Please note that the file formats
created by GDBM and dbm are incompatible.
GDBM objects behave like mappings (dictionaries), except that keys and
values are always strings. Printing a GDBM object doesn't print the
keys and values, and the items() and values() methods are not
- open(filename, [flags, [mode]]) -> dbm_object
Open a dbm database and return a dbm object. The filename argument is
the name of the database file.
The optional flags argument can be 'r' (to open an existing database
for reading only -- default), 'w' (to open an existing database for
reading and writing), 'c' (which creates the database if it doesn't
exist), or 'n' (which always creates a new empty database).
Some versions of gdbm support additional flags which must be
appended to one of the flags described above. The module constant
'open_flags' is a string of valid additional flags. The 'f' flag
opens the database in fast mode; altered data will not automatically
be written to the disk after every change. This results in faster
writes to the database, but may result in an inconsistent database
if the program crashes while the database is still open. Use the
sync() method to force any unwritten data to be written to the disk.
The 's' flag causes all database operations to be synchronized to
disk. The 'u' flag disables locking of the database file.
The optional mode argument is the Unix mode of the file, used only
when the database has to be created. It defaults to octal 0666.
||open_flags = 'rwcnfsu'|