6.5 The del statement
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Deletion is recursively defined very similar to the way assignment is defined. Rather
that spelling it out in full details, here are some hints.
Deletion of a target list recursively deletes each target, from left to right.
Deletion of a name removes the binding of that name from the local or global namespace,
depending on whether the name occurs in a global statement in the
same code block. If the name is unbound, a NameError exception
will be raised.
It is illegal to delete a name from the local namespace if it occurs as a free variable
in a nested block.
Deletion of attribute references, subscriptions and slicings is passed to the primary
object involved; deletion of a slicing is in general equivalent to assignment of an empty
slice of the right type (but even this is determined by the sliced object).
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