[docs] [issue30826] More details in reference 'Looping through a list in Python and modifying it'

[Terry J. Reedy]

Terry J. Reedy added the comment:

I agree that the tutorial For section needs be updated to include non-sequences. A dict example will help with that.

I agree that the unrealistic insert mis-directs attention and like Raymond's replacement.  ['users.copy()' should be 'users.copy().items']

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versions: +Python 3.7

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<https://bugs.python.org/issue30826>
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