Python Traversal Dictionary Delete element

There must be a problem with this approach:

D = {' A ': 1, ' B ': 2, ' C ': 3}for key in D:d.pop (key)

will report this error:runtimeerror:dictionary changed size during iteration

This way Python2 feasible, Python3 still reported the above error.

D = {' A ': 1, ' B ': 2, ' C ': 3}for key in D.keys ():d. Pop (key)

The reason for the Python3 error is that the keys () function returns Dict_keys instead of list. The possible ways to Python3 are as follows:

D = {' A ': 1, ' B ': 2, ' C ': 3}for key in List (d):d. Pop (key)

Reference: How to avoid "runtimeerror:dictionary changed size during iteration" error?

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Python Traversal Dictionary Delete element