Python虚拟环境中成功安装包后仍触发ModuleNotFoundError的问题求助

我在运行Linaro内核的嵌入式计算机上搭建了Python虚拟环境，但在虚拟环境里用pip安装任何包后，都会出现ModuleNotFoundError: No module named 'x'的错误；但如果在虚拟环境外安装包，一切都正常。

背景情况 #

• 最开始我是用python3 -m ensurepip --default-pip安装的pip，版本是22.2.2。后来尝试用pip install --upgrade pip升级到24.3.1，虽然提示安装成功，但出现了警告：

WARNING: The scripts pip, pip3 and pip3.10 are installed in '/var/user-packages/data/user_storage/ot2-dil-ali/bin' which is not on PATH.

• 我把这个目录加到了$PATH里，但之后用pip安装包时还是会提示no module named pip，无奈只能重新运行最初的命令装回了22.2.2版本的pip。另外我在home目录和/etc目录里都找不到.profile或.bashrc文件。

环境路径检查结果 #

运行which python3 pip的结果如下：

(myvenv) # which python3 pip
/data/user_storage/ot2-dil-ali/bin/python3
/data/user_storage/ot2-dil-ali/bin/pip
# which python3 pip
/usr/bin/python3
/usr/bin/pip

安装包后的异常表现 #

在虚拟环境里安装包时，明明显示安装成功：

(myvenv) # python3 -m pip install loguru
Collecting loguru
  Using cached loguru-0.7.3-py3-none-any.whl (61 kB)
Installing collected packages: loguru
Successfully installed loguru-0.7.3

但尝试导入时会触发ModuleNotFoundError，而且虚拟环境的site-packages目录里根本找不到这个包：

(myvenv) # ls myvenv/lib/python3.10/site-packages/
_distutils_hack              pip-22.2.2.dist-info         setuptools-63.2.0.dist-info
distutils-precedence.pth     pkg_resources
pip                          setuptools

后续排查尝试 #

Edit 1: 指定虚拟环境内的pip安装仍无效

即使直接用虚拟环境目录下的pip安装，问题依旧：

(myvenv) # myvenv/bin/pip install loguru
Collecting loguru
  Using cached loguru-0.7.3-py3-none-any.whl (61 kB)
Installing collected packages: loguru
Successfully installed loguru-0.7.3

[notice] A new release of pip available: 22.2.2 -> 24.3.1
[notice] To update, run: pip install --upgrade pip
(myvenv) # myvenv/bin/python3
...
>>> import loguru
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'loguru'
>>>

Edit 2: 详细安装日志

用带详细日志的命令安装，日志显示pip确实在处理安装，但结果还是一样：

(myvenv) # myvenv/bin/pip3 install loguru -v -v -v
Using pip 22.2.2 from /data/user_storage/myvenv/lib/python3.10/site-packages/pip (python 3.10)
Non-user install because user site-packages disabled
Created temporary directory: /tmp/pip-ephem-wheel-cache-mw5uucuc
Created temporary directory: /tmp/pip-build-tracker-ya1d5lt3
Initialized build tracking at /tmp/pip-build-tracker-ya1d5lt3
Created build tracker: /tmp/pip-build-tracker-ya1d5lt3
Entered build tracker: /tmp/pip-build-tracker-ya1d5lt3
Created temporary directory: /tmp/pip-install-r6fhmj4u
1 location(s) to search for versions of loguru:
* https://pypi.org/simple/loguru/
Fetching project page and analyzing links: https://pypi.org/simple/loguru/
Getting page https://pypi.org/simple/loguru/
Found index url https://pypi.org/simple
Looking up "https://pypi.org/simple/loguru/" in the cache
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
https://pypi.org:443 "GET /simple/loguru/ HTTP/1.1" 304 0
Fetched page https://pypi.org/simple/loguru/ as application/vnd.pypi.simple.v1+json
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  Found link https://files.pythonhosted.org/packages