我正在尝试为本教程安装Open CV ... https://www.youtube.com/watch?v=Hqf__FlRlzg&list=WL&index=4&t=2494s 我已经安装了它，当我在终端中输入pip list时，它表明我已经安装了它
pip list
Package Version
-------------------------------------- ----------
absl-py 0.8.1
alabaster 0.7.12
anaconda-client 1.7.2
anaconda-navigator 1.9.7
anaconda-project 0.8.3
appnope 0.1.0
appscript 1.0.1
asn1crypto 0.24.0
astor 0.8.0
astroid 2.2.5
astropy 3.2.1
atomicwrites 1.3.0
attrs 19.1.0
Babel 2.7.0
backcall 0.1.0
backports.functools-lru-cache 1.5
backports.os 0.1.1
backports.shutil-get-terminal-size 1.0.0
backports.tempfile 1.0
backports.weakref 1.0.post1
beautifulsoup4 4.7.1
bitarray 0.9.3
bkcharts 0.2
bleach 3.1.0
bokeh 1.2.0
boto 2.49.0
Bottleneck 1.2.1
certifi 2019.11.28
cffi 1.12.3
chardet 3.0.4
Click 7.0
cloudpickle 1.2.1
clyent 1.2.2
colorama 0.4.1
conda 4.8.0
conda-build 3.18.8
conda-package-handling 1.3.11
conda-verify 3.4.2
contextlib2 0.5.5
cryptography 2.7
cycler 0.10.0
Cython 0.29.12
cytoolz 0.10.0
dask 2.1.0
decorator 4.4.0
defusedxml 0.6.0
distributed 2.1.0
docutils 0.14
entrypoints 0.3
et-xmlfile 1.0.1
fastcache 1.1.0
filelock 3.0.12
Flask 1.1.1
future 0.17.1
gast 0.3.2
gevent 1.4.0
glob2 0.7
gmpy2 2.0.8
greenlet 0.4.15
grpcio 1.16.1
h5py 2.9.0
heapdict 1.0.0
html5lib 1.0.1
idna 2.8
imageio 2.5.0
imagesize 1.1.0
importlib-metadata 0.17
ipykernel 5.1.1
ipython 7.6.1
ipython-genutils 0.2.0
ipywidgets 7.5.0
isort 4.3.21
itsdangerous 1.1.0
jdcal 1.4.1
jedi 0.13.3
Jinja2 2.10.1
joblib 0.13.2
json5 0.8.4
jsonschema 3.0.1
jupyter 1.0.0
jupyter-client 5.3.1
jupyter-console 6.0.0
jupyter-core 4.5.0
jupyterlab 1.0.2
jupyterlab-server 1.0.0
Keras-Applications 1.0.8
Keras-Preprocessing 1.1.0
keyring 18.0.0
kiwisolver 1.1.0
lazy-object-proxy 1.4.1
libarchive-c 2.8
lief 0.9.0
llvmlite 0.29.0
locket 0.2.0
lxml 4.3.4
Markdown 3.1.1
MarkupSafe 1.1.1
matplotlib 3.1.0
mccabe 0.6.1
mistune 0.8.4
mkl-fft 1.0.12
mkl-random 1.0.2
mkl-service 2.0.2
mock 3.0.5
more-itertools 7.0.0
MouseInfo 0.1.2
mpmath 1.1.0
msgpack 0.6.1
multipledispatch 0.6.0
navigator-updater 0.2.1
nbconvert 5.5.0
nbformat 4.4.0
networkx 2.3
nltk 3.4.4
nose 1.3.7
notebook 6.0.0
numba 0.44.1
numexpr 2.6.9
numpy 1.16.4
numpydoc 0.9.1
olefile 0.46
opencv-python 4.1.2.30
openpyxl 2.6.2
packaging 19.0
pandas 0.24.2
pandocfilters 1.4.2
parso 0.5.0
partd 1.0.0
path.py 12.0.1
pathlib2 2.3.4
patsy 0.5.1
pep8 1.7.1
pexpect 4.7.0
pickleshare 0.7.5
Pillow 6.1.0
pip 19.3.1
pkginfo 1.5.0.1
pluggy 0.12.0
ply 3.11
prometheus-client 0.7.1
prompt-toolkit 2.0.9
protobuf 3.11.2
psutil 5.6.3
ptyprocess 0.6.0
py 1.8.0
PyAutoGUI 0.9.48
pycodestyle 2.5.0
pycosat 0.6.3
pycparser 2.19
pycrypto 2.6.1
pycurl 7.43.0.3
pyflakes 2.1.1
pygame 1.9.6
PyGetWindow 0.0.8
Pygments 2.4.2
pylint 2.3.1
PyMsgBox 1.0.7
pyobjc 6.1
pyobjc-core 6.1
pyobjc-framework-Accounts 6.1
pyobjc-framework-AddressBook 6.1
pyobjc-framework-AppleScriptKit 6.1
pyobjc-framework-AppleScriptObjC 6.1
pyobjc-framework-ApplicationServices 6.1
pyobjc-framework-Automator 6.1
pyobjc-framework-AVFoundation 6.1
pyobjc-framework-AVKit 6.1
pyobjc-framework-CalendarStore 6.1
pyobjc-framework-CFNetwork 6.1
pyobjc-framework-CloudKit 6.1
pyobjc-framework-Cocoa 6.1
pyobjc-framework-Collaboration 6.1
pyobjc-framework-CoreAudio 6.1
pyobjc-framework-CoreAudioKit 6.1
pyobjc-framework-CoreBluetooth 6.1
pyobjc-framework-CoreData 6.1
pyobjc-framework-CoreLocation 6.1
pyobjc-framework-CoreMedia 6.1
pyobjc-framework-CoreMediaIO 6.1
pyobjc-framework-CoreServices 6.1
pyobjc-framework-CoreText 6.1
pyobjc-framework-CoreWLAN 6.1
pyobjc-framework-CryptoTokenKit 6.1
pyobjc-framework-DictionaryServices 6.1
pyobjc-framework-DiscRecording 6.1
pyobjc-framework-DiscRecordingUI 6.1
pyobjc-framework-DiskArbitration 6.1
pyobjc-framework-DVDPlayback 6.1
pyobjc-framework-EventKit 6.1
pyobjc-framework-ExceptionHandling 6.1
pyobjc-framework-FinderSync 6.1
pyobjc-framework-FSEvents 6.1
pyobjc-framework-GameCenter 6.1
pyobjc-framework-GameController 6.1
pyobjc-framework-GameKit 6.1
pyobjc-framework-ImageCaptureCore 6.1
pyobjc-framework-IMServicePlugIn 6.1
pyobjc-framework-InputMethodKit 6.1
pyobjc-framework-InstallerPlugins 6.1
pyobjc-framework-InstantMessage 6.1
pyobjc-framework-IOSurface 6.1
pyobjc-framework-iTunesLibrary 6.1
pyobjc-framework-LatentSemanticMapping 6.1
pyobjc-framework-LaunchServices 6.1
pyobjc-framework-libdispatch 6.1
pyobjc-framework-LocalAuthentication 6.1
pyobjc-framework-MapKit 6.1
pyobjc-framework-MediaAccessibility 6.1
pyobjc-framework-MediaLibrary 6.1
pyobjc-framework-MediaToolbox 6.1
pyobjc-framework-MultipeerConnectivity 6.1
pyobjc-framework-NetFS 6.1
pyobjc-framework-NotificationCenter 6.1
pyobjc-framework-OpenDirectory 6.1
pyobjc-framework-OSAKit 6.1
pyobjc-framework-PreferencePanes 6.1
pyobjc-framework-PubSub 6.1
pyobjc-framework-QTKit 6.1
pyobjc-framework-Quartz 6.1
pyobjc-framework-SceneKit 6.1
pyobjc-framework-ScreenSaver 6.1
pyobjc-framework-ScriptingBridge 6.1
pyobjc-framework-SearchKit 6.1
pyobjc-framework-Security 6.1
pyobjc-framework-SecurityFoundation 6.1
pyobjc-framework-SecurityInterface 6.1
pyobjc-framework-ServiceManagement 6.1
pyobjc-framework-Social 6.1
pyobjc-framework-SpriteKit 6.1
pyobjc-framework-StoreKit 6.1
pyobjc-framework-SyncServices 6.1
pyobjc-framework-SystemConfiguration 6.1
pyobjc-framework-VideoToolbox 6.1
pyobjc-framework-WebKit 6.1
pyodbc 4.0.26
pyOpenSSL 19.0.0
pyparsing 2.4.0
pyperclip 1.7.0
PyRect 0.1.4
pyrsistent 0.14.11
PyScreeze 0.1.25
PySocks 1.7.0
pytest 5.0.1
pytest-arraydiff 0.3
pytest-astropy 0.5.0
pytest-doctestplus 0.3.0
pytest-openfiles 0.3.2
pytest-remotedata 0.3.1
python-dateutil 2.8.0
PyTweening 1.0.3
pytz 2019.1
PyWavelets 1.0.3
PyYAML 5.1.1
pyzmq 18.0.0
QtAwesome 0.5.7
qtconsole 4.5.1
QtPy 1.8.0
requests 2.22.0
rope 0.14.0
ruamel-yaml 0.15.46
scikit-image 0.15.0
scikit-learn 0.21.2
scipy 1.3.0
seaborn 0.9.0
Send2Trash 1.5.0
setuptools 41.0.1
simplegeneric 0.8.1
singledispatch 3.4.0.3
six 1.12.0
sklearn 0.0
snowballstemmer 1.9.0
sortedcollections 1.1.2
sortedcontainers 2.1.0
soupsieve 1.8
Sphinx 2.1.2
sphinxcontrib-applehelp 1.0.1
sphinxcontrib-devhelp 1.0.1
sphinxcontrib-htmlhelp 1.0.2
sphinxcontrib-jsmath 1.0.1
sphinxcontrib-qthelp 1.0.2
sphinxcontrib-serializinghtml 1.1.3
sphinxcontrib-websupport 1.1.2
spyder 3.3.6
spyder-kernels 0.5.1
SQLAlchemy 1.3.5
statsmodels 0.10.0
sympy 1.4
tables 3.5.2
tblib 1.4.0
tensorboard 1.14.0
tensorflow 1.14.0
tensorflow-estimator 1.14.0
termcolor 1.1.0
terminado 0.8.2
testpath 0.4.2
tflearn 0.3.2
toolz 0.10.0
tornado 6.0.3
tqdm 4.32.1
traitlets 4.3.2
unicodecsv 0.14.1
urllib3 1.24.2
wcwidth 0.1.7
webencodings 0.5.1
Werkzeug 0.15.4
wheel 0.33.4
widgetsnbextension 3.5.0
wrapt 1.11.2
wurlitzer 1.0.2
xlrd 1.2.0
XlsxWriter 1.1.8
xlwings 0.15.8
xlwt 1.3.0
zict 1.0.0
zipp 0.5.1
如果您查看O部分，则会看到opencv-python，但是在我的项目中，当我尝试使用它导入
import cv2
它不起作用，并显示此错误消息...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/cv2/__init__.py", line 3, in <module>
from .cv2 import *
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/cv2/cv2.cpython-38-darwin.so, 2): Symbol not found: _clock_gettime
Referenced from: /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/cv2/.dylibs/libavutil.56.31.100.dylib (which was built for Mac OS X 10.12)
Expected in: /usr/lib/libSystem.B.dylib
in /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/cv2/.dylibs/libavutil.56.31.100.dylib
我尝试了以下导入方法，但是似乎没有任何作用
import opencv
import cv4
import cv3
import cv
import opencv-python
etc...
任何帮助将不胜感激，并在此先感谢您
答案 0 :(得分：0)
我相信您正在使用masOS。
这是最新的Pillow 5.1.0版本中的错误。
这是由于将Xcode从版本8升级到9.2来构建二进制车轮而引起的。
Capitan 10.11是Xcode 8的“最低运行macOS”。
Sierra 10.12.6是Xcode 9.2的最小值。
https://en.wikipedia.org/wiki/Xcode#Xcode_7.0_-9.x(since_Free_On-Device_Development
将在某个时候修复Pillow 5.1.1。
与此同时，解决方法是：pip install'pillow！= 5.1.0'
（或升级您的macOS，或从源代码构建。）
有关更多信息，请参见https://github.com/python-pillow/Pillow/issues/3068
答案 1 :(得分：0)
您显示一个pip list和一个堆栈跟踪，表明您正在使用Python 3.8。除非在MacOS上出现了奇怪的现象，否则您将需要使用pip3（而不是pip）来安装opencv-python。之后
import cv2
应该工作。
答案 2 :(得分：0)
显然，OpenCV 4.1.x不喜欢El Capitan ...将OpenCV降级到3.4.5.20：
在所需的环境中：
pip install --force-reinstall opencv-contrib-python==3.4.5.20
其他：
sudo -H python3 -m pip install --force-reinstall opencv-contrib-python==3.4.5.20