python3.dll is missing

[Siecje]

Anaconda 4.2.0 is missing python3.dll.

After pip install PyQt5==5.7.1 importing import PyQt5.QtCore fails with missing .dll message.

Dependency Walker lists python3.dll as missing.

By adding python3.dll from an installer from python.org to the Anaconda install directory (same place as python35.dll), PyQt5 works.

[ccordoba12]

Please use conda packages to install PyQt5. We don't support pip packages for it right now.

[Aspirinkb]

I use 'conda install -c nmearl pyqt5=5.5.0' to install PyQt5 on my mac in python3.5 env. from PyQt5.QtWidgets import ( QWidget, QPushButton, QApplication, QHBoxLayout, QVBoxLayout, QFileDialog, QMessageBox, QLabel, QTableWidget, QTableWidgetItem, QDialog) can not run and the error information as follows

Traceback (most recent call last):
File "", line 1, in
from PyQt5.QtWidgets import (
ImportError: dlopen(/Users/yan/anaconda/envs/face_identification_tpe/lib/python3.5/site-packages/PyQt5/QtWidgets.so, 2): Library not loaded: @rpath/./libicui18n.56.dylib
Referenced from: /Users/yan/anaconda/envs/face_identification_tpe/lib/libQt5Core.5.5.0.dylib
Reason: image not found

[ccordoba12]

nmearl is not the default channel. To install PyQt5 with conda you simply need to run

conda install pyqt

[Aspirinkb]

@ccordoba12 Oh, thank you. I had pyqt 4.11.4 installed, so I update it.

[ccordoba12]

👍

[Siecje]

There is no conda package for the newest PyQt5.

It might be worth you updating the report to say that the bug is not specific to PyQt5 and affects all extension modules that rely on PEP 384.
https://www.riverbankcomputing.com/pipermail/pyqt/2017-February/038833.html

[ccordoba12]

There is no conda package for the newest PyQt5.

We know there isn't. The reason is we need to support Python 2 on Windows and that's impossible to do for Qt 5.7 and newer versions.

[ccordoba12]

@mingwandroid, do you understand the implications of not having python3.dll on Windows? Can we provide it?

[mingwandroid]

Seems like we're breaking PEP 384 by not having it.

I expect we could easily provide it yes; taking a look now.

[rausm]

As a temporary workaround, python3.dll from WinPython works for me (Python 3.6, x64).

At least latest WinPython (2017/4/1) has it (maybe even the 2017/01/28, i think the older ones didn't have it).

Should cover at least Python 3.5 & 3.6, both 32 & 64bit

EDIT: The "Zero" versions contain Python3.dll, and are significantly smaller then the "full" packages.

[shaneahmed]

By adding python3.dll from an installer from python.org to the Anaconda install directory (same place as python35.dll), PyQt5 works.

Installing using conda install qyqt does not fix the issue.

[scw]

The conda packages for Python from the last six months all include python3.dll. I think this issue can safely be closed.

[mingwandroid]

Thanks @scw.

[liudenaxietian]

after install anaconda with python 3.7.3 (contain python3.dll),when execute"from PyQt5 import QtCore",it will show "DLL load fail" error,can anyone who can tell me why?

[rausm]

after install anaconda with python (contain python3.dll),when execute"from PyQt5 import QtCore",it will show "DLL load fail" error,can anyone who can tell me why?

when having troubles with missing dependencies, grab http://dependencywalker.com/ and have a blast ;-)