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Importing a module throws ModuleNotFoundError even after module is installed

I'm trying to install pyperclip on Python 3.8.6 on Windows 10, and after typing
pip3 install pyperclip
in cmd it tells me that pyperclip has been successfully installed, but when I then try import pyperclip on they Python shell I get the following error message:
Traceback (most recent call last):
File "<pyshell#0>", line 1, in <module>
import pyperclip
ModuleNotFoundError: No module named 'pyperclip'
I've tried uninstalling and reinstalling pyperclip using pip, and also installing an older version of the package (1.8.0) but the error persists.
Thanks for your help!

Can't start spyder because of PyQt5.QtWebKitWidgets

I have a problem with spyder.
I just installed on this laptop Python 3.7 and Spyder, as I did on many others. However this time, it doesn't work.
I installed Python 3.7.2 (tags/v3.7.2:9a3ffc0492, Dec 23 2018, 23:09:28) [MSC v.1916 64 bit (AMD64)] on win32 with the installer. I changed the path to a custom path: C:\Python\Python37, I added the precompile library and I added the path to the environment.
The laptop was rebooted at that point.
Then I updated pip:
py -3.7 -m pip install --upgrade pip
And then I installed spyder:
py -3.7 -m pip install spyder
I then try to launch spyder with the file:
C:\Python\Pythno37\Lib\site-packages\spyder\app\start.py
I get the error:
ModuleNotFoundError: No module named 'PyQt5.QtWebKitWidgets'
PyQt5 is installed with version 5.12.
No clue why it doesn't work...
EDIT: The full error message:
It sugggest that the problem comes from qtpy. However, the corresponding file imports:
from . import PYQT5,PYSIDE2, PYQT4, PYSIDE, PythonQtError
# To test if we are using WebEngine or WebKit
WEBENGINE = True
if PYQT5:
try:
from PyQt5.QtWebEngineWidgets import QWebEnginePage
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWebEngineWidgets import QWebEngineSettings
except ImportError:
from PyQt5.QtWebKitWidgets import QWebPage as QWebEnginePage
from PyQt5.QtWebKitWidgets import QWebView as QWebEngineView
from PyQt5.QtWebKit import QWebSettings as QWebEngineSettings
WEBENGINE = False
The PyQt5.QtWebEngnieWidgets is correctly used.

I swapped Pyqt5 version from 5.12 to 5.11.2 with:
py -m pip install pyqt5==5.11.2
And now it works...

Three days ago I was playing around with Python, Mayavi and Jupyter Notebooks to create visualizations. This required to install PyQt5.
Due to constantly reaching memory errors, I've decided to test without using virtualenv's and installed the needed requirements on my local environment (which of course didn't solve).
After that, I was on my way to create visualizations using matplotlib and other Python libraries but can't launch Spyder from the Anaconda Navigator.
This is the error showing up, which is similar to yours
Traceback (most recent call last):
File "C:\Users\tiago\Anaconda3\lib\site-packages\qtpy\QtWebEngineWidgets.py", line 22, in
from PyQt5.QtWebEngineWidgets import QWebEnginePage
ModuleNotFoundError: No module named 'PyQt5.QtWebEngineWidgets'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\tiago\Anaconda3\Scripts\spyder-script.py", line 10, in
sys.exit(main())
File "C:\Users\tiago\Anaconda3\lib\site-packages\spyder\app\start.py", line 186, in main
from spyder.app import mainwindow
File "C:\Users\tiago\Anaconda3\lib\site-packages\spyder\app\mainwindow.py", line 90, in
from qtpy import QtWebEngineWidgets # analysis:ignore
File "C:\Users\tiago\Anaconda3\lib\site-packages\qtpy\QtWebEngineWidgets.py", line 26, in
from PyQt5.QtWebKitWidgets import QWebPage as QWebEnginePage
ModuleNotFoundError: No module named 'PyQt5.QtWebKitWidgets'
The correct answer didn't work in my case.
This problem had to do with the PyQt5 installation. The way to fix it was to uninstall it
pip uninstall PyQt5
and then Spyder launched perfectly

Anaconda Navigator does not open

I have installed Anaconda (which failed a few times) and removed it again. Then installed Miniconda and after several rounds succeeded. In Terminal 'condo list'gives a result.
However, I cannot open the Anaconda Navigator.
I would like to start using Spyder. Spyder is not found in Terminal.
I checked other questions on Stack Overflow about this but nothing seems to work.
(base) 192:~ lsluyser$ sudo anaconda-navigator
Password:
Traceback (most recent call last):
File "/anaconda3/lib/python3.7/site-packages/qtpy/__init__.py", line 199, in <module>
from PySide import __version__ as PYSIDE_VERSION # analysis:ignore
ModuleNotFoundError: No module named 'PySide'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/anaconda3/bin/anaconda-navigator", line 7, in <module>
from anaconda_navigator.app.main import main
File "/anaconda3/lib/python3.7/site-packages/anaconda_navigator/app/main.py", line 22, in <module>
from anaconda_navigator.utils.conda import is_conda_available
File "/anaconda3/lib/python3.7/site-packages/anaconda_navigator/utils/__init__.py", line 15, in <module>
from qtpy.QtGui import QIcon
File "/anaconda3/lib/python3.7/site-packages/qtpy/__init__.py", line 205, in <module>
raise PythonQtError('No Qt bindings could be found')
qtpy.PythonQtError: No Qt bindings could be found
I use a Mac Ox 10.9 and Python 3.7.
Thanks in advance for your help.

I too suffered the same multiple installation sequence as you mentioned on a Windows 10 machine.
Finally I removed a file named ".condarc" left over due to the incorrect uninstall.
The next installation of anaconda was successful in launching anaconda-navigator
but on a Mac with Homebrew installed I faced no such issues.Tip:"."Dot files are hidden on a Mac

I encountered a similar problem, I have Windows 7 installed as my OS.
Simple solution:
Uninstall Anaconda
Reinstall downloading the latest version
Before
opening the GUI, open the Conda Prompt & update all packages:
conda update --all
Now Open the GUI.
It worked for me.

Cannot run Spyder because No module named 'PySide'

I wanted to try using Spyder IDE. I was reading this page on how to open and run Spyder: https://github.com/spyder-ide/spyder/releases
I typed the following commands as specified in the page:
conda update qt pyqt
conda update spyder
Both commands gave "# All requested packages already installed.".
I then typed spyder into my terminal (Mac):
Macs-MacBook:~ macuser$ spyder
Traceback (most recent call last):
File "/anaconda3/lib/python3.6/site-packages/qtpy/__init__.py", line 166, in <module>
from PySide import __version__ as PYSIDE_VERSION # analysis:ignore
ModuleNotFoundError: No module named 'PySide'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/anaconda3/bin/spyder", line 11, in <module>
sys.exit(main())
File "/anaconda3/lib/python3.6/site-packages/spyder/app/start.py", line 159, in main
from spyder.app import mainwindow
File "/anaconda3/lib/python3.6/site-packages/spyder/app/mainwindow.py", line 49, in <module>
So, I tried to install PySide:
Macs-MacBook:~ macuser$ conda install PySide
Solving environment: failed
UnsatisfiableError: The following specifications were found to be in conflict:
- anaconda==5.2.0=py36_3
- pyside
Use "conda info <package>" to see the dependencies for each package.
What should I do to get up and running with Spyder?

try below commands let me know if it works.
pip install msgpack
conda install qt=5.6 pyqt=5.6 sip=4.18

While other solutions found on the web didn't work for me (such as the one above and using $ pip install pyqt5), I solved this by uninstalling and reinstalling Spyder via terminal, using pip.
$ pip uninstall spyder
...
$ pip install spyder
...
Not sure why, but it worked on the first try.

Mr J.
I had the same problem as Doug Fir. I used these commands. I launched spyder from the DOS prompt. I got "RuntimeError: module compiled against API version 0xb but this version of numpy is 0xa" as was the case before. Just as I was rolling my eyes, Spyder went ahead and started. So I think it worked.

Try to delete the .condarc file. I do not know the specific reason but I faced the same issue and when I deleted the .condarc file it worked for me.

I had same error on Linux and solved deleting:
rm -rf .local/lib/python3.9/
rm -rf .local/share/Spyder/

pyqt5 cannot install with python 3.5

I installed python 3.5 then install pyqt5.5.1, when installing the binary file under win7, it showed warning that it's built under python3.4.I installed to the python35 directory anyway.I can open Assistant in start menu.But in python it's not working:
from PyQt5.QtCore import * Traceback (most recent call last): File "", line 1, in
from PyQt5.QtCore import * ImportError: DLL load failed

Use pip to install the Windows wheel file
The installer were based on 3.4. So you can't use it.
Download LINK
Command line guide: pip install name_of_file.whl
PS: install SIP in the same way.