Solve the problem of abnormal reporting when deleting elements when traversing the dictionary in Python

Wrong code ①

##

d = {'a':1, 'b':0, 'c':1, 'd':0}
for key, val in d.items():
  del(d[k])

Wrong code ② -- For Python3

d = {'a':1, 'b':0, 'c':1, 'd':0}
for key, val in d.keys():
  del(d[k])

Correct code

d = {'a':1, 'b':0, 'c':1, 'd':0}
keys = list(d.keys())
for key, val in keys:
  del(d[k])

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