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<H1><A NAME="SECTION008300000000000000000"></A><A NAME="ssi-data-scope"></A>
<BR>
6.3 Scope of Global Data
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<P>
Multiple instances of 'eval' or 'exec' code blocks may be used within the
one page. Any changes to or creation of global data which is performed
within one code block will be reflected in any following code blocks.
Global data constitutes variables as well as module imports, function and
class definitions.
<P>
<div class="verbatim"><pre>
<!--#python exec="
import cgi, time, os
def _escape(object):
return cgi.escape(str(object))
now = time.time()
" -->
<html>
<body>
<pre>
<!--#python eval="_escape(time.asctime(time.localtime(now)))"-->
<!--#python exec="
keys = os.environ.keys()
keys.sort()
for key in keys:
print >> filter, _escape(key),
print >> filter, '=',
print >> filter, _escape(repr(os.environ.get(key)))
" -->
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<P>
The lifetime of any global data is for the current request only. If data
must persist between requests, it must reside in external modules and as
necessary be protected against multithreaded access in the event that a
multithreaded Apache MPM is used.
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<span class="release-info">Release 3.3.1, documentation updated on January 29, 2007.</span>
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