Python's simple way of traversing dictionaries and deleting elements _python

This article illustrates how Python simply traverses the dictionary and deletes elements. Share to everyone for your reference, specific as follows:

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 or 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 a dict_keys instead of a list. The Python3 is available in the following ways:

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

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I hope this article will help you with Python programming.