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