RuntimeError: dictionary changed size during iteration 解决办法

在字典遍历过程中修改字典元素，报错 RuntimeError: dictionary changed size during iteration

得知遍历时不能修改字典元素

for k in func_dict.keys():
if func_dict[k] is np.nan:
del func_dict[k]
continue
解决办法：将遍历条件改为列表

for k in list(func_dict.keys()):
if func_dict[k] is np.nan:
del func_dict[k]
continue
https://blog.csdn.net/u013344884/article/details/81867225

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