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\chapter{Python Services}
The modules described in this chapter provide a wide range of services
related to the Python interpreter and its interaction with its
environment. Here's an overview:
\begin{description}
\item[sys]
--- Access system specific parameters and functions.
\item[types]
--- Names for all built-in types.
\item[UserDict]
\item[UserList]
--- Class wrappers for dictionary and list objects.
\item[operator]
--- All python's standard operators as built-in functions.
\item[traceback]
--- Print or retrieve a stack traceback.
\item[pickle]
--- Convert Python objects to streams of bytes and back.
\item[copy_reg]
--- Register \code{pickle} support functions.
\item[shelve]
--- Python object persistency.
\item[copy]
--- Shallow and deep copy operations.
\item[marshal]
--- Convert Python objects to streams of bytes and back (with
different constraints).
\item[imp]
--- Access the implementation of the \code{import} statement.
\item[ni]
--- New import (obsolete).
\item[parser]
--- Retrieve and submit parse trees from and to the runtime support
environment.
\item[symbol]
--- Constants representing internal nodes of the parse tree.
\item[token]
--- Constants representing terminal nodes of the parse tree.
\item[keyword]
--- Test whether a string is a keyword in the Python language.
\item[code]
--- Code object services.
\item[pprint]
--- Data pretty printer.
\item[dis]
--- Disassembler.
\item[site]
--- A standard way to reference site-specific modules.
\item[user]
--- A standard way to reference user-specific modules.
\item[__builtin__]
--- The set of built-in functions.
\item[__main__]
--- The environment where the top-level script is run.
\end{description}
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