# cpython-withatomic / Doc / libdbm.tex

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  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 \section{Built-in Module \sectcode{dbm}} \bimodindex{dbm} Dbm provides python programs with an interface to the unix \code{ndbm} database library. Dbm objects are of the mapping type, so they can be handled just like objects of the built-in \dfn{dictionary} type, except that keys and values are always strings, and printing a dbm object doesn't print the keys and values. The module defines the following constant and functions: \renewcommand{\indexsubitem}{(in module dbm)} \begin{excdesc}{error} Raised on dbm-specific errors, such as I/O errors. \code{KeyError} is raised for general mapping errors like specifying an incorrect key. \end{excdesc} \begin{funcdesc}{open}{filename\, rwmode\, filemode} Open a dbm database and return a mapping object. \var{filename} is the name of the database file (without the \file{.dir} or \file{.pag} extensions), \var{rwmode} is \code{'r'}, \code{'w'} or \code{'rw'} as for \code{open}, and \var{filemode} is the unix mode of the file, used only when the database has to be created. \end{funcdesc} 
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