From the documentation:
If the platform supports the
unsetenv()function, you can delete items in this mapping to unset environment variables.unsetenv()will be called automatically when an item is deleted from os.environ, and when one of thepop()orclear()methods is called.
However I want something that will work regardless of the availability of unsetenv(). How do I delete items from the mapping if it's not available? os.environ['MYVAR'] = None?
Just
del os.environ['MYVAR']
should work.
del os.environ worked for when os.unsetenv did not on OSX.
del: docs.python.org/2/tutorial/…
MYVAR doesn't exist in the environment, you will get an exception. You can wrap it in a try: but it's unfortunate.For those who search for an elegant way to unset environment variable without errors if the variable does not exist:
os.environ.pop('MYVAR', None)
That works exactly as:
if 'MYVAR' in os.environ:
del os.environ['MYVAR']
But if you need to deal with the exception, do what other users suggested: del os.environ['MYVAR'] or os.environ.pop('MYVAR').
You can still delete items from the mapping, but it will not really delete the variable from the environment if unsetenv() is not available.
del os.environ['MYVAR']
Try this if you need a valid method, such as in TestCase.addCleanup()
os.environ.pop('MYVAR')
unsetenvworks on "most flavors of Unix, Windows" according to the docs.$ unset MYVARcommands work