How to simply traverse a dictionary and delete elements in Python

The example in this article describes how to simply traverse a dictionary and delete elements in Python. Share it with everyone for your reference, the details are as follows:

There must be something wrong with this method:

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 method is feasible for Python2, but Python3 still reports the above error.

d = {'a':1, 'b':2, 'c':3}
for key in d.keys():
  d.pop(key)

The reason why Python3 reports an error is that the keys() function returns dict_keys instead of list. The possible methods for Python3 are as follows:

d = {'a':1, 'b':2, 'c':3}
for key in list(d):
  d.pop(key)

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