dumbdbm
— 便携式 DBM 实施
¶
注意
The
dumbdbm
module has been renamed to
dbm.dumb
in Python 3. The
2to3
tool will automatically adapt imports when converting your sources to Python 3.
注意
The
dumbdbm
module is intended as a last resort fallback for the
anydbm
module when no more robust module is available. The
dumbdbm
module is not written for speed and is not nearly as heavily used as the other database modules.
The
dumbdbm
module provides a persistent dictionary-like interface which is written entirely in Python. Unlike other modules such as
gdbm
and
bsddb
, no external library is required. As with other persistent mappings, the keys and values must always be strings.
模块定义如下：
dumbdbm.
error
¶
Raised on dumbdbm-specific errors, such as I/O errors.
KeyError
is raised for general mapping errors like specifying an incorrect key.
dumbdbm.
open
(
filename
[
,
flag
[
,
mode
]
]
)
¶
Open a dumbdbm database and return a dumbdbm object. The
filename
argument is the basename of the database file (without any specific extensions). When a dumbdbm database is created, files with
.dat
and
.dir
extensions are created.
可选 flag argument is currently ignored; the database is always opened for update, and will be created if it does not exist.
可选
mode
argument is the Unix mode of the file, used only when the database has to be created. It defaults to octal
0666
(and will be modified by the prevailing umask).
2.2 版改变： The mode argument was ignored in earlier versions.
In addition to the dictionary-like methods,
dumbdm
objects provide the following method:
dumbdbm.
close
(
)
¶
Close the
dumbdm
database.
另请参阅
anydbm
Generic interface to
dbm
-style databases.
dbm
Similar interface to the DBM/NDBM library.
gdbm
Similar interface to the GNU GDBM library.
shelve
Persistence module which stores non-string data.
whichdb
Utility module used to determine the type of an existing database.
In addition to the methods provided by the
UserDict.DictMixin
class,
dumbdbm
objects provide the following methods.