我目前正在尝试使用pyenv创建一个新的虚拟环境，我使用pyenv安装了从3.7.x到3.9.x的各种版本的python。
为了创建一个环境，我正在做以下工作：
$pyenv virtualenv 3.8.7 practice_django
它创建环境并输出：
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，我知道环境应该被正确创建并被激活。
现在，当我执行pip list时，我得到以下内容(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.
当我尝试卸载时，会发生以下情况：
$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virtualenvpractice_rasa的包。
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，没有安装任何软件包-今天开始出现这个错误。
p.S:即使我用不同的python版本创建了一个环境，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，但没有帮助。
对于基于python3.7.9的virtualenv，我在pip卸载上得到了类似的东西
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.
程序包websockets似乎位于虚拟环境practice_rasa中，该环境具有python版本3.8.7。
我也遇到过同样的问题。在我看来，环境隔离似乎被打破了。
根据我的经验，您可能同时使用conda和pyenv。您可能需要从~/.bash_profile或~/.zshrc文件中删除任何conda-configs语句。