Python3:ImportError: No module named 'compiler.ast'

from compiler.ast import flatten

上面这条语句好像在python3 以后就废除了，如果使用的话就会报错。
Traceback (most recent call last):
File "eval_ssd_network.py", line 31, in <module>
from compiler.ast import flatten
ImportError: No module named 'compiler'

或者
Traceback (most recent call last):
File "eval_ssd_network.py", line 31, in <module>
from compiler.ast import flatten
ImportError: No module named 'compiler.ast'

因此，查资料显示，需要自己写一个函数：
import collections
def flatten(x):
result = []
for el in x:
if isinstance(x, collections.Iterable) and not isinstance(el, str):
result.extend(flatten(el))
else:
result.append(el)
return result

print(flatten(["junk",["nested stuff"],[],[[]]]))

参考文献
[1].Python 3 replacement for deprecated compiler.ast flatten function.https://stackoverflow.com/questions/16176742/python-3-replacement-for-deprecated-compiler-ast-flatten-function
[2].Python 3 replacement for deprecated compiler.ast flatten function. https://reformatcode.com/code/python/python-3-replacement-for-deprecated-compilerast-flatten-function

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作者：农民小飞侠
来源：CSDN
原文：https://blog.csdn.net/w5688414/article/details/78489277
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