我目前正在尝试使用创建一个新的虚拟环境pyenv，我安装了pyenv从 3.7.x 到 3.9.x的各种版本的 python。
为了创建环境，我正在执行以下操作：
$pyenv virtualenv 3.8.7 practice_django
它创建环境并输出它：
Looking in links: /var/folders/w1/dw5vm6p955bgmws4x53sjlym0000gn/T/tmpwltofgj8
Requirement already satisfied: setuptools in /Users/apple/.pyenv/versions/3.8.7/envs/practice_rasa/lib/python3.8/site-packages (49.2.1)
Requirement already satisfied: pip in /Users/apple/.pyenv/versions/3.8.7/envs/practice_django/lib/python3.8/site-packages (20.2.3)
然后我使用以下方法激活环境：
$pyenv activate practice_django
并通过以下方式检查虚拟环境是否已成功创建并且正确：
$pyenv which python
/Users/apple/.pyenv/versions/practice_django/bin/python
$python -V
Python 3.8.7 # my global python is 3.7.5
$pip -V
pip 20.2.3 from /Users/apple/.pyenv/versions/3.8.7/envs/practice_django/lib/python3.8/site-packages/pip (python 3.8)
所以，我知道环境应该已经正确创建并被激活。
现在，当我执行 a 时pip list，我得到以下信息（不安装任何软件包）：
Package Version
----------------------- ------------
absl-py 0.12.0
aio-pika 6.8.0
aiofiles 0.7.0
aiormq 3.3.1
alembic 1.4.3
APScheduler 3.7.0
astunparse 1.6.3
async-generator 1.10
async-timeout 3.0.1
attrs 19.3.0
bidict 0.21.2
boto3 1.17.78
botocore 1.20.78
cachetools 4.2.2
certifi 2020.12.5
cffi 1.14.5
cloudpickle 1.6.0
colorclass 2.2.0
coloredlogs 15.0
colorhash 1.0.3
croniter 1.0.13
cryptography 3.4.7
cycler 0.10.0
dm-tree 0.1.6
dnspython 1.16.0
docopt 0.6.2
fbmessenger 6.0.0
future 0.18.2
gast 0.3.3
gitdb 4.0.7
GitPython 3.1.17
google-auth 1.30.0
google-auth-oauthlib 0.4.4
google-pasta 0.2.0
greenlet 1.1.0
grpcio 1.38.0
h11 0.9.0
h5py 2.10.0
httpcore 0.11.1
httplib2 0.19.1
httptools 0.2.0
httpx 0.15.4
humanfriendly 9.1
idna 2.10
isodate 0.6.0
jmespath 0.10.0
joblib 0.15.1
jsonpickle 2.0.0
jsonschema 3.2.0
kafka-python 1.4.7
Keras-Preprocessing 1.1.2
kiwisolver 1.3.1
Mako 1.1.4
Markdown 3.3.4
MarkupSafe 2.0.1
matplotlib 3.3.4
mattermostwrapper 2.2
networkx 2.5.1
numpy 1.18.5
oauth2client 4.1.3
oauthlib 3.1.0
opt-einsum 3.3.0
packaging 20.9
pamqp 2.3.0
pika 1.2.0
Pillow 8.2.0
pip 20.2.3
prompt-toolkit 2.0.10
protobuf 3.17.0
psycopg2-binary 2.8.6
pyasn1 0.4.8
pyasn1-modules 0.2.8
pycparser 2.20
pydot 1.4.2
pykwalify 1.8.0
pymongo 3.10.1
pyparsing 2.4.7
pyrsistent 0.17.3
pyTelegramBotAPI 3.7.9
python-crfsuite 0.9.7
python-dateutil 2.8.1
python-editor 1.0.4
python-engineio 4.2.0
python-socketio 5.3.0
pytz 2021.1
PyYAML 5.4.1
rasa 2.6.2
rasa-sdk 2.6.0
rasa-x 0.39.3
redis 3.5.3
regex 2020.9.27
requests 2.25.1
requests-oauthlib 1.3.0
requests-toolbelt 0.9.1
rfc3986 1.5.0
rocketchat-API 1.15.0
rsa 4.7.2
ruamel.yaml 0.16.13
ruamel.yaml.clib 0.2.2
s3transfer 0.4.2
Sanic-Cors 0.10.0.post3
Sanic-Plugins-Framework 0.9.5
scikit-learn 0.24.2
scipy 1.6.3
sentry-sdk 0.19.5
setuptools 49.2.1
six 1.16.0
sklearn-crfsuite 0.3.6
slackclient 2.9.3
smmap 4.0.0
sniffio 1.2.0
SQLAlchemy 1.3.22
tabulate 0.8.9
tensorboard 2.5.0
tensorboard-data-server 0.6.1
tensorboard-plugin-wit 1.8.0
tensorflow 2.3.2
tensorflow-addons 0.12.0
tensorflow-estimator 2.3.0
tensorflow-hub 0.10.0
tensorflow-probability 0.11.1
tensorflow-text 2.3.0
termcolor 1.1.0
terminaltables 3.1.0
threadpoolctl 2.1.0
tqdm 4.59.0
twilio 6.50.1
typeguard 2.12.0
typing-extensions 3.10.0.0
tzlocal 2.1
ujson 1.35
urllib3 1.26.4
uvloop 0.14.0
wcwidth 0.2.5
webexteamssdk 1.6
websockets 8.1
Werkzeug 2.0.1
wheel 0.36.2
wrapt 1.12.1
yarl 1.6.3
WARNING: You are using pip version 20.2.3; however, version 21.1.2 is available.
You should consider upgrading via the '/Users/apple/.pyenv/versions/3.8.7/envs/practice_django/bin/python3.8 -m pip install --upgrade pip' command.
当我尝试进行卸载时，会发生这种情况：
$pip uninstall tensorflow
Found existing installation: tensorflow 2.3.2
Not uninstalling tensorflow at /Users/apple/.pyenv/versions/3.8.7/envs/practice_rasa/lib/python3.8/site-packages, outside environment /Users/apple/.pyenv/versions/3.8.7/envs/practice_django
Can't uninstall 'tensorflow'. No files were found to uninstall.
这表明我的 virtualenvpractice_django可能正在使用来自另一个 virtualenv 的包practice_rasa。
现在，如果我尝试导入tensorflow，我可以导入它。
我想创建一个干净的 virtualenv，没有安装任何包 - 今天开始出现这个错误。
PS：即使我使用不同的 python 版本创建环境，比如3.7.9，我也会得到同样的错误。我也尝试过升级 pip 版本 - 这没有帮助。
对于基于python3.7.9的 virtualenv，我在pip 卸载时得到了类似的东西
Found existing installation: websockets 8.1
Not uninstalling websockets at /Users/apple/.pyenv/versions/3.8.7/envs/practice_rasa/lib/python3.8/site-packages, outside environment /Users/apple/.pyenv/versions/3.7.9/envs/practice_django
Can't uninstall 'websockets'. No files were found to uninstall.
包 websockets 似乎位于虚拟环境practice_rasa中，它具有 python 版本3.8.7。