无法从“集合”导入名称“MutableMapping”

Question

我收到以下错误：

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  File "/home/ron/rzg2l_bsp_v1.3/poky/bitbake/lib/bb/compat.py", line 7, in <module>\n    from collections import MutableMapping, KeysView, ValuesView, ItemsView, OrderedDict\nImportError: cannot import name 'MutableMapping' from 'collections' (/usr/lib/python3.10/collections/__init__.py)\n

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谷歌搜索显示 Flask 必须 >=2.0，所以我这样做了

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$ sudo pacman -Syu python-flask\n

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安装的版本 ( 2.0.2-3)

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这并没有解决问题。进一步搜索发现 babelfish 也需要升级，所以我这样做了：

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$ python3.10 -m pip install babelfish -U\n

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这向我展示了：

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Defaulting to user installation because normal site-packages is not writeable\nRequirement already satisfied: babelfish in /home/ron/.local/lib/python3.10/site-packages (0.6.0)\nCollecting babelfish\n  Using cached babelfish-0.6.0-py3-none-any.whl (93 kB)\n  Downloading babelfish-0.5.5.tar.gz (90 kB)\n     |\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88\xe2\x96\x88| 90 kB 406 kB/s\n

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但我仍然遇到同样的错误。谁能告诉我还缺少什么吗？

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Answer 1

您需要导入collections.abc

这是文档的链接

>>> from collections import MutableMapping
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'MutableMapping' from 'collections' (/usr/lib/python3.10/collections/__init__.py)
>>> from collections.abc import MutableMapping

自版本 3.3 起已弃用，将在版本 3.10 中删除：将集合抽象基类移至collections.abc模块。为了向后兼容，它们在 Python 3.9 中继续在此模块中可见。

参考号 https://docs.python.org/3.9/library/collections.html

Answer 2

如果您有多名口译员，请使用：

import sys

if sys.version_info[:2] >= (3, 8):
    from collections.abc import MutableMapping
else:
    from collections import MutableMapping

Answer 3

自 Python 3.3 起，直接导入已被弃用，并将在 Python 3.9 中停止工作。您需要使用导入

from collections.abc import MutableMapping

这是我收到的贬值警告

DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working