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<H2><A NAME="SECTION0019110000000000000000"></A><A NAME="rexec-objects"></A>
<BR>
17.1.1 RExec Objects 
</H2>

<P>
<tt class="class">RExec</tt> instances support the following methods:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4914' xml:id='l2h-4914' class="method">r_eval</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
<var>code</var> must either be a string containing a Python expression, or
a compiled code object, which will be evaluated in the restricted
environment's <tt class="module">__main__</tt> module.  The value of the expression or
code object will be returned.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4915' xml:id='l2h-4915' class="method">r_exec</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
<var>code</var> must either be a string containing one or more lines of
Python code, or a compiled code object, which will be executed in the
restricted environment's <tt class="module">__main__</tt> module.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4916' xml:id='l2h-4916' class="method">r_execfile</tt></b>(</nobr></td>
  <td><var>filename</var>)</td></tr></table></dt>
<dd>
Execute the Python code contained in the file <var>filename</var> in the
restricted environment's <tt class="module">__main__</tt> module.
</dl>

<P>
Methods whose names begin with "<tt class="samp">s_</tt>" are similar to the functions
beginning with "<tt class="samp">r_</tt>", but the code will be granted access to
restricted versions of the standard I/O streams <code>sys.stdin</code>,
<code>sys.stderr</code>, and <code>sys.stdout</code>.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4917' xml:id='l2h-4917' class="method">s_eval</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
<var>code</var> must be a string containing a Python expression, which will
be evaluated in the restricted environment.  
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4918' xml:id='l2h-4918' class="method">s_exec</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
<var>code</var> must be a string containing one or more lines of Python code,
which will be executed in the restricted environment.  
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4919' xml:id='l2h-4919' class="method">s_execfile</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Execute the Python code contained in the file <var>filename</var> in the
restricted environment.
</dl>

<P>
<tt class="class">RExec</tt> objects must also support various methods which will be
implicitly called by code executing in the restricted environment.
Overriding these methods in a subclass is used to change the policies
enforced by a restricted environment.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4920' xml:id='l2h-4920' class="method">r_import</tt></b>(</nobr></td>
  <td><var>modulename</var><big>[</big><var>, globals</var><big>[</big><var>,
                             locals</var><big>[</big><var>, fromlist</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Import the module <var>modulename</var>, raising an <tt class="exception">ImportError</tt>
exception if the module is considered unsafe.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4921' xml:id='l2h-4921' class="method">r_open</tt></b>(</nobr></td>
  <td><var>filename</var><big>[</big><var>, mode</var><big>[</big><var>, bufsize</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Method called when <tt class="function">open()</tt> is called in the restricted
environment.  The arguments are identical to those of <tt class="function">open()</tt>,
and a file object (or a class instance compatible with file objects)
should be returned.  <tt class="class">RExec</tt>'s default behaviour is allow opening
any file for reading, but forbidding any attempt to write a file.  See
the example below for an implementation of a less restrictive
<tt class="method">r_open()</tt>.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4922' xml:id='l2h-4922' class="method">r_reload</tt></b>(</nobr></td>
  <td><var>module</var>)</td></tr></table></dt>
<dd>
Reload the module object <var>module</var>, re-parsing and re-initializing it.  
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4923' xml:id='l2h-4923' class="method">r_unload</tt></b>(</nobr></td>
  <td><var>module</var>)</td></tr></table></dt>
<dd>
Unload the module object <var>module</var> (remove it from the
restricted environment's <code>sys.modules</code> dictionary).
</dl>

<P>
And their equivalents with access to restricted standard I/O streams:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4924' xml:id='l2h-4924' class="method">s_import</tt></b>(</nobr></td>
  <td><var>modulename</var><big>[</big><var>, globals</var><big>[</big><var>,
                             locals</var><big>[</big><var>, fromlist</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Import the module <var>modulename</var>, raising an <tt class="exception">ImportError</tt>
exception if the module is considered unsafe.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4925' xml:id='l2h-4925' class="method">s_reload</tt></b>(</nobr></td>
  <td><var>module</var>)</td></tr></table></dt>
<dd>
Reload the module object <var>module</var>, re-parsing and re-initializing it.  
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4926' xml:id='l2h-4926' class="method">s_unload</tt></b>(</nobr></td>
  <td><var>module</var>)</td></tr></table></dt>
<dd>
Unload the module object <var>module</var>.   
</dl>

<P>

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	54
	55	<H2><A NAME="SECTION0019110000000000000000"></A><A NAME="rexec-objects"></A>
	56	<BR>
	57	17.1.1 RExec Objects
	58	</H2>
	59
	60	<P>
	61	<tt class="class">RExec</tt> instances support the following methods:
	62
	63	<P>
	64	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
65	<td><nobr><b><tt id='l2h-4914' xml:id='l2h-4914' class="method">r_eval</tt></b>(</nobr></td>
66	<td><var>code</var>)</td></tr></table></dt>
67	<dd>
68	<var>code</var> must either be a string containing a Python expression, or
69	a compiled code object, which will be evaluated in the restricted
70	environment's <tt class="module">__main__</tt> module. The value of the expression or
71	code object will be returned.
72	</dl>
73
74	<P>
75	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
76	<td><nobr><b><tt id='l2h-4915' xml:id='l2h-4915' class="method">r_exec</tt></b>(</nobr></td>
77	<td><var>code</var>)</td></tr></table></dt>
78	<dd>
79	<var>code</var> must either be a string containing one or more lines of
80	Python code, or a compiled code object, which will be executed in the
81	restricted environment's <tt class="module">__main__</tt> module.
82	</dl>
83
84	<P>
85	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
86	<td><nobr><b><tt id='l2h-4916' xml:id='l2h-4916' class="method">r_execfile</tt></b>(</nobr></td>
87	<td><var>filename</var>)</td></tr></table></dt>
88	<dd>
89	Execute the Python code contained in the file <var>filename</var> in the
90	restricted environment's <tt class="module">__main__</tt> module.
91	</dl>
92
93	<P>
94	Methods whose names begin with "<tt class="samp">s_</tt>" are similar to the functions
95	beginning with "<tt class="samp">r_</tt>", but the code will be granted access to
96	restricted versions of the standard I/O streams <code>sys.stdin</code>,
97	<code>sys.stderr</code>, and <code>sys.stdout</code>.
98
99	<P>
100	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
101	<td><nobr><b><tt id='l2h-4917' xml:id='l2h-4917' class="method">s_eval</tt></b>(</nobr></td>
102	<td><var>code</var>)</td></tr></table></dt>
103	<dd>
104	<var>code</var> must be a string containing a Python expression, which will
105	be evaluated in the restricted environment.
106	</dl>
107
108	<P>
109	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
110	<td><nobr><b><tt id='l2h-4918' xml:id='l2h-4918' class="method">s_exec</tt></b>(</nobr></td>
111	<td><var>code</var>)</td></tr></table></dt>
112	<dd>
113	<var>code</var> must be a string containing one or more lines of Python code,
114	which will be executed in the restricted environment.
115	</dl>
116
117	<P>
118	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
119	<td><nobr><b><tt id='l2h-4919' xml:id='l2h-4919' class="method">s_execfile</tt></b>(</nobr></td>
120	<td><var>code</var>)</td></tr></table></dt>
121	<dd>
122	Execute the Python code contained in the file <var>filename</var> in the
123	restricted environment.
124	</dl>
125
126	<P>
127	<tt class="class">RExec</tt> objects must also support various methods which will be
128	implicitly called by code executing in the restricted environment.
129	Overriding these methods in a subclass is used to change the policies
130	enforced by a restricted environment.
131
132	<P>
133	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
134	<td><nobr><b><tt id='l2h-4920' xml:id='l2h-4920' class="method">r_import</tt></b>(</nobr></td>
135	<td><var>modulename</var><big>[</big><var>, globals</var><big>[</big><var>,
136	locals</var><big>[</big><var>, fromlist</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
137	<dd>
138	Import the module <var>modulename</var>, raising an <tt class="exception">ImportError</tt>
139	exception if the module is considered unsafe.
140	</dl>
141
142	<P>
143	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
144	<td><nobr><b><tt id='l2h-4921' xml:id='l2h-4921' class="method">r_open</tt></b>(</nobr></td>
145	<td><var>filename</var><big>[</big><var>, mode</var><big>[</big><var>, bufsize</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
146	<dd>
147	Method called when <tt class="function">open()</tt> is called in the restricted
148	environment. The arguments are identical to those of <tt class="function">open()</tt>,
149	and a file object (or a class instance compatible with file objects)
150	should be returned. <tt class="class">RExec</tt>'s default behaviour is allow opening
151	any file for reading, but forbidding any attempt to write a file. See
152	the example below for an implementation of a less restrictive
153	<tt class="method">r_open()</tt>.
154	</dl>
155
156	<P>
157	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
158	<td><nobr><b><tt id='l2h-4922' xml:id='l2h-4922' class="method">r_reload</tt></b>(</nobr></td>
159	<td><var>module</var>)</td></tr></table></dt>
160	<dd>
161	Reload the module object <var>module</var>, re-parsing and re-initializing it.
162	</dl>
163
164	<P>
165	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
166	<td><nobr><b><tt id='l2h-4923' xml:id='l2h-4923' class="method">r_unload</tt></b>(</nobr></td>
167	<td><var>module</var>)</td></tr></table></dt>
168	<dd>
169	Unload the module object <var>module</var> (remove it from the
170	restricted environment's <code>sys.modules</code> dictionary).
171	</dl>
172
173	<P>
174	And their equivalents with access to restricted standard I/O streams:
175
176	<P>
177	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
178	<td><nobr><b><tt id='l2h-4924' xml:id='l2h-4924' class="method">s_import</tt></b>(</nobr></td>
179	<td><var>modulename</var><big>[</big><var>, globals</var><big>[</big><var>,
180	locals</var><big>[</big><var>, fromlist</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
181	<dd>
182	Import the module <var>modulename</var>, raising an <tt class="exception">ImportError</tt>
183	exception if the module is considered unsafe.
184	</dl>
185
186	<P>
187	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
188	<td><nobr><b><tt id='l2h-4925' xml:id='l2h-4925' class="method">s_reload</tt></b>(</nobr></td>
189	<td><var>module</var>)</td></tr></table></dt>
190	<dd>
191	Reload the module object <var>module</var>, re-parsing and re-initializing it.
192	</dl>
193
194	<P>
195	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
196	<td><nobr><b><tt id='l2h-4926' xml:id='l2h-4926' class="method">s_unload</tt></b>(</nobr></td>
197	<td><var>module</var>)</td></tr></table></dt>
198	<dd>
199	Unload the module object <var>module</var>.
200	</dl>
201
202	<P>
203
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