os.environ.update doesn't really update os.environ --
it doesn't call putenv subsequently.

This is the test code:

#test1.py
import os
FILENAME='test2.py'
env={};env['ENVIRON_UPDATE']='123';os.environ.update(env)
os.environ['ENVIRON_DIRECT_SETTING']='123'
cmdline='c:\python24\python.exe -u %s'%FILENAME
fs=os.popen3(cmdline,'b')
print fs[1].read()

#test2.py
import os
if os.environ.has_key('ENVIRON_UPDATE'):print
'os.env.update worked'
else:print 'os.env.update failed'
if os.environ.has_key('ENVIRON_DIRECT_SETTING'):print
'os.env assignment worked'
else:print 'os.env assignment failed'

Run test1.py with python 2.4 on windows.

The reason os.environ.update doesn't work is the update
method is removed from 2.4. (It works with 2.3)

Following is the patch:

--- os.py       Thu Jan 27 07:09:38 2005
+++ os_new.py   Thu Jan 27 07:10:44 2005
@@ -435,6 +435,9 @@
                 return key.upper() in self.data
             def get(self, key, failobj=None):
                 return self.data.get(key.upper(), failobj)
+            def update(self, dict):
+                for k, v in dict.items():
+                    self[k] = v
             def copy(self):
                 return dict(self)

@@ -446,6 +449,9 @@
             def __setitem__(self, key, item):
                 putenv(key, item)
                 self.data[key] = item
+            def update(self, dict):
+                for k, v in dict.items():
+                    self[k] = v
             try:
                 unsetenv
             except NameError:

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This is the cause of the cgi bug #1100235.

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The update methods in os.py were removed in the Revision
1.75. Thu Mar 4 08:25:44 2004 UTC according to the cvs.

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Thanks for the report. Fixed in

os.py 1.85
test_os.py 1.29
NEWS 1.1235
os.py 1.83.2.1
NEWS 1.1193.2.17