[docs] Example doesn't work

I'm learning on Python 3.8 (32-bit) on a Windows-10 machine. In Section 4.2. for Statements, the second example "Iterate over a copy" fails in practice.

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for user, status in users.copy().items():

... if status == 'inactive': ... del users[user] ... Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'users' is not defined

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active_users = {}

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for user, status in users.items():

... if status == 'active': ... active_users[user] = status ... Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'users' is not defined

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