Comment 0 for bug 812845

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Jonathan Lange (jml) wrote : EnvironmentVariableFixture example is confusing

The document at <> says:

Isolate your code from environmental variables, delete them or set them to a new value.

>>> fixture = fixtures.EnvironmentVariableFixture('HOME')

But it is not at all clear whether that isolates (how?), deletes or sets to a new value. Regardless of which it does, it's unclear how to achieve the other two without looking at the source code.