Nikos:
I tested already (before asking)env = os.environ.copy() if list_only: env['GRASS_VERBOSE'] = '3' but it does not work.
Moritz:
In Python, something like this should work IIRC: import os os.environ['GRASS_VERBOSE'] = '3'
But of course it works! Don't know why I got stuck with env instead os.environ.
For the records, it's somewhat about the logic of the script I am building. Yet also that, copy(), as used in the first example, creates a shallow copy. Deep copy works, i.e. `env=copy.deepcopy(os.environ)` or simply `env=os.environ` Nikos
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