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author | Raymond Hettinger <python@rcn.com> | 2003-09-12 06:33:37 (GMT) |
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committer | Raymond Hettinger <python@rcn.com> | 2003-09-12 06:33:37 (GMT) |
commit | deadbf50e4cc3c541e706d5bf1aa73624bed36a6 (patch) | |
tree | 407b9e5f2aa93866cdda5fb5b70fee3d49d2de0e /Doc | |
parent | 74c8e55f3b64b8819a1950be4ac1323c74931cc2 (diff) | |
download | cpython-deadbf50e4cc3c541e706d5bf1aa73624bed36a6.zip cpython-deadbf50e4cc3c541e706d5bf1aa73624bed36a6.tar.gz cpython-deadbf50e4cc3c541e706d5bf1aa73624bed36a6.tar.bz2 |
SF #662923
Add support for the iterator and mapping protocols.
For Py2.3, this was done for shelve, dumbdbm and other mapping objects, but
not for bsddb and dbhash which were inadvertently missed.
Diffstat (limited to 'Doc')
-rw-r--r-- | Doc/lib/libbsddb.tex | 19 | ||||
-rw-r--r-- | Doc/lib/libdbhash.tex | 14 |
2 files changed, 24 insertions, 9 deletions
diff --git a/Doc/lib/libbsddb.tex b/Doc/lib/libbsddb.tex index 7fb8f76..719783b 100644 --- a/Doc/lib/libbsddb.tex +++ b/Doc/lib/libbsddb.tex @@ -100,8 +100,9 @@ systems which ship with the old Berkeley DB 1.85 database library. The \subsection{Hash, BTree and Record Objects \label{bsddb-objects}} -Once instantiated, hash, btree and record objects support the following -methods: +Once instantiated, hash, btree and record objects support +the same methods as dictionaries. In addition, they support +the following methods: \begin{methoddesc}{close}{} Close the underlying file. The object can no longer be accessed. Since @@ -177,6 +178,20 @@ Example: ('2', '4') >>> db.previous() ('1', '1') +>>> for k, v in db.iteritems(): +... print k, v +0 0 +1 1 +2 4 +3 9 +4 16 +5 25 +6 36 +7 49 +8 64 +9 81 +>>> 8 in db +True >>> db.sync() 0 \end{verbatim} diff --git a/Doc/lib/libdbhash.tex b/Doc/lib/libdbhash.tex index 00a6d08..ecaa6c9 100644 --- a/Doc/lib/libdbhash.tex +++ b/Doc/lib/libdbhash.tex @@ -51,23 +51,23 @@ This module provides an exception and a function: \subsection{Database Objects \label{dbhash-objects}} The database objects returned by \function{open()} provide the methods -common to all the DBM-style databases. The following methods are -available in addition to the standard methods. +common to all the DBM-style databases and mapping objects. The following +methods are available in addition to the standard methods. \begin{methoddesc}[dbhash]{first}{} - It's possible to loop over every key in the database using this method - and the \method{next()} method. The traversal is ordered by + It's possible to loop over every key/value pair in the database using + this method and the \method{next()} method. The traversal is ordered by the databases internal hash values, and won't be sorted by the key values. This method returns the starting key. \end{methoddesc} \begin{methoddesc}[dbhash]{last}{} - Return the last key in a database traversal. This may be used to + Return the last key/value pair in a database traversal. This may be used to begin a reverse-order traversal; see \method{previous()}. \end{methoddesc} \begin{methoddesc}[dbhash]{next}{} - Returns the key next key in a database traversal. The + Returns the key next key/value pair in a database traversal. The following code prints every key in the database \code{db}, without having to create a list in memory that contains them all: @@ -79,7 +79,7 @@ for i in xrange(1, len(d)): \end{methoddesc} \begin{methoddesc}[dbhash]{previous}{} - Returns the previous key in a forward-traversal of the database. + Returns the previous key/value pair in a forward-traversal of the database. In conjunction with \method{last()}, this may be used to implement a reverse-order traversal. \end{methoddesc} |