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PyQt5.QtWidgets module not found when pyqt is installed with Anaconda

I can import PyQt5 but I cannot import from PyQt5.QtWidgets when I install pyqt in a conda environment.
I've tried uninstalling and reinstalling with conda and that did not solve the problem.
If I install with pip in a regular virtual environment instead of with Anaconda then it works.
This is the code:
from PyQt5.QtWidgets import *
This is the error:
$ python main.py
Traceback (most recent call last):
File "main.py", line 1, in <module>
from PyQt5.QtWidgets import *
ModuleNotFoundError: No module named 'PyQt5.QtWidgets'

Turns out it was a path problem. I had installed Homebrew after Anaconda and /usr/local/bin was in front of $HOME/anaconda3/bin in $PATH, so Homebrew Python was being called instead of Anaconda Python.

No module named PyQt5.sip

After upgrading to python-pyqt5 5.12-2 I get this error when I try to import from QtWidgets
from PyQt5.QtWidgets import *
Error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'PyQt5.sip'
Any idea on how can I solve this issue?

The reason is a backward incompatible change in PyQt-5.11
In geoptics this fix works on old and new versions:
try:
# new location for sip
# https://www.riverbankcomputing.com/static/Docs/PyQt5/incompatibilities.html#pyqt-v5-11
from PyQt5 import sip
except ImportError:
import sip

As suggested here pyuic5 - ModuleNotFoundError: No module named PyQt5.sip
Try uninstalling and re-installing all PyQt related libraries:
pip uninstall PyQt5
pip uninstall PyQt5-sip
pip uninstall PyQtWebEngine
Then install them again, this will fix:
ModuleNotFoundError: No module named 'PyQt5.sip'
ModuleNotFoundError: No module named 'PyQt5.QtWebEngineWidgets'
PPS.:If you got problems uninstalling the libraries, go to your Python folder, like C:\Users\<USERNAME>\AppData\Local\Programs\Python\Python<PYTHON-VERSION>\Lib\site-packages and manually delete the PyQt folders, them uninstall everything and install again (Make sure you have the latest Python version and upgraded your pip too)

If you're building sip and PyQt5 from source using make files, make sure to check PyQt5 install docs. In particular,
Note
When building PyQt5 v5.11 or later you must configure SIP to create a
private copy of the sip module using a command line similar to the
following:
python configure.py --sip-module PyQt5.sip
If you already have SIP installed and you just want to build and
install the private copy of the module then add the --no-tools option.

You should add PyQt5.sip to hidden imports; that should solve the issue.

I repaired this problem
This problem occurred when upgrading pyqt5 version 5.15.0
There was no problem when I reverted to the previous version.
I have
python -V: 3.7.4
PYQT5 5.14.1 and PYSIDE 5.14.1 works fine

In addition to the answer provided by Tadeu (https://stackoverflow.com/a/58880976/12455023) I would also suggest checking version of your libraries to make sure that they match.
Use pip show <library_name>
This will help you to make sure that no earlier installation is conflicting with your current installation.
In place of library_name use PyQt5, PyQt5-sip, PyQtWebEngine. If any of them is present in the system, then use pip uninstall <library_name>==<version_number> to remove that library.
Once you made sure that no other versions of these libraries are there, then you can reinstall the preferred version of that library.

Pyqt5 is installed but gives dll failed to load error on import?

So, I tried to install PyQt5(version 5.7.1) for my miniconda3(python version 3.5.1) with pip install PyQt5 and it shows up when I try conda list in console:
But no pyqt5 program is running and when I import something like:
from PyQt5.QtWidgets import QApplication
its gives an ImportError:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: DLL load failed: The specified module could not be found.
How can I fix this? Do I have to install C++ and Qt lib for C++ for this to work?? Please Help!

I know it's an old question, i've found solution that worked for me, maybe it will be useful for somebody else.
conda list
should contain pyqt PyQt5 and qt. If any of it are not there, you need to install it - run:
conda install qt, for example.
I see in the question there is pyqt and PyQt5 installed, but is there qt?

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.

pyside import error on mac osx

I'm trying to use PySide so I did a brew install pyside pyside-tools. However, I get the following error:
>>> from PySide.QtGui import QApplication
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: dlopen(/Library/Python/2.7/site-packages/PySide/QtGui.so, 2): Library not loaded: QtGui.framework/Versions/4/QtGui
Referenced from: /Library/Python/2.7/site-packages/PySide/QtGui.so
Reason: image not found
This SO question says to install python 27 and then reinstall pyside but I'm using the native python on mac osx 10.8 and it is already 2.7.2.
The Homebrew recipe for PySide seems to indicate that this should have been fixed but I'm still getting the errors. I made sure libpng is installed as well.
Looking at the path, I know that the QtGui.so file is there. Since I'm new to Python, PySide, and Qt, it is hard for me to Google and further troubleshoot.
If anyone knows why and can provide directions, I will be very grateful. It can involve uninstalling a bunch of stuff and reinstalling. Please give detailed instructions. I did uninstall and try to reinstall and got the same result.
Thank you.

I was getting the same error, and I'm using Python installed via Homebrew. I found two PySide libraries in /Library/Python/2.7/site-packages/ . Moving them out of the way, and re-building/installing PySide through Homebrew worked.

I tried the import you gave - I am using same system environment. It worked fine. try: brew update and re-install.

Got the same error when running ipython qtconsole which will import PySide to provide a Qt console.
Finally I thought there might be something wrong after PySide's installation. So I run pyside_postinstall.py -install manually which should be automatically run after PySide is installed, and this fixed my problem. Hopes working for your too!