解决Python 遍历字典时删除元素报异常的问题

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

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

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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