I have seen the FAQ https://wiki.qt.io/Qt_for_Python#Frequently_Asked_Questions which states
Take into account that if you want to generate bindings for a Qt/C++
project, the linking to the Qt shared libraries will be missing, and
you will need to do this by hand. We recommend to build PySide2 from
scratch to have everything properly linked.
Suppose you want to use shiboken2 to wrap a c++ library which itself uses qt and it even uses qt classes in its interface. In the python world you should be able to
pip install PySide2 my_cpp_lib
and afterwards python scripts shall be able to
import my_cpp_lib
from PySide2.QtCore import QObject
my_cool_object = QObject()
my_cpp_lib.my_cool_api(my_cool_object)
It is pretty unclear to me how to achieve that setup. From the FAQ I deduce that it would be good to compile PySide2 from source in this case (because I want to use shiboken2_generator to wrap my_cpp_lib). However, I still want to be compatible to the standard PySide2 package (of course there will be a version dependency between my_cpp_lib and PySide2).
Is linking against the QT shared object/dll of PySide2 a bad idea? If so, why? what would be better instead?
If the qt library should be packaged together with the my_cpp_lib python package, then how is it possible to still use PySide without conflicts (because there are essential two different shared objects)?
I currently begin to use Python (2.7) with Eclipse(on windows). To run my script,I would need PyQt4 but I meet some problems when I try to install it.
I downloaded
PyQt4-4.10.3-gpl-Py2.7-Qt4.8.5-x64.exe,
PyQt-win-gpl-4.10.3.zip
and sip-4.15.2.zip
from the following link: http://www.riverbankcomputing.co.uk/software/pyqt/download .
I launched the execution of the first feature and a folder PyQt4 appeared into C:\Python27\Lib\site-packages.
To my mind, PyQt4 installation was finished and I simply did:
Eclipse>Preferences>Pydev>Interpreter-Python>python27>Apply
Nevertheless, when I try to import any function of PyQt4, I am said that the module name is unknown.
Could you help me to solve this problem?
Thank you very much
I want to comment for this .... but my reputation doesn't allow me to :(
anyway You could try this answer ..... (link below)
which is something like that :
Copy from This Answer
PyQt is actually a wrapping of C++ Qt libraries. So they are not .py
files an
d PyDev can't analyze them to
get what is in them. You need to add PyQt4 in the Forced Builtins tab,
so that PyDev can use a Python shell to "look into" those libraries
and know what is in them. That will also give you code-completion for
PyQt.
Apart from that, it is usually not a good practice to use from foo
import *. You'll be importing everything inside your namespace and you
wouldn't know which is coming from where. Moreover you might have name
clashes that mask each other. Though it is unlikely with PyQt, still
I'd suggest you get used to from PyQt4 import QtGui, QtCore and
reference classes like QtGui.QMainWindow.
I am using Eclipse 3.7.1 with the latest PyDev add-in for Python coding. I am using PyQt4. At the top of my file I have:
from PyQt4.QtCore import *
from PyQt4.QtGui import *
In addition, I have the PyQt4 tree included in the Project Explorer listing. However, eclipse still thinks the names like QMainWindow are undefined. The code runs fine. How may I get eclipse to recognize those names.
Thanks
PyQt is actually a wrapping of C++ Qt libraries. So they are not .py files and PyDev can't analyze them to get what is in them. You need to add PyQt4 in the Forced Builtins tab, so that PyDev can use a Python shell to "look into" those libraries and know what is in them. That will also give you code-completion for PyQt.
Apart from that, it is usually not a good practice to use from foo import *. You'll be importing everything inside your namespace and you wouldn't know which is coming from where. Moreover you might have name clashes that mask each other. Though it is unlikely with PyQt, still I'd suggest you get used to from PyQt4 import QtGui, QtCore and reference classes like QtGui.QMainWindow.
it happens sometimes that PyDev lose its mind...
If restarting Eclipse don't do the trick, consider doing this:
Click on the "Apply" button and select your python interpreter. That should force Eclipse to recover existing libraries.
Does anyone know of a automated GUI testing package for that works with PyQT besides Squish? Nothing against Squish I am just looking for other packages. It would be cool if there were an open source package. I am doing my testing under Linux.
It looks like PyQT4 includes a QtTest object that can be used for unit testing.
WATSUP has worked for me.
You should be able to use pyunit in conjunction with PyQT.
http://pyunit.sourceforge.net/
You can use py.test with the pytest-qt plugin. There's a simple example of how it can be used here
Another alternative is to use the built-in unittest module together with QtTest (parts of QtTest has been built into PyQt). A longer example is given in this article
All of this is free and open source :)
Python works on multiple platforms and can be used for desktop and web applications, thus I conclude that there is some way to compile it into an executable for Mac, Windows and Linux.
The problem being I have no idea where to start or how to write a GUI with it, can anybody shed some light on this and point me in the right direction please?
First you will need some GUI library with Python bindings and then (if you want) some program that will convert your python scripts into standalone executables.
Cross-platform GUI libraries with Python bindings (Windows, Linux, Mac)
Of course, there are many, but the most popular that I've seen in wild are:
Tkinter - based on Tk GUI toolkit (de-facto standard GUI library for python, free for commercial projects)
WxPython - based on WxWidgets (popular, free for commercial projects)
Qt using the PyQt bindings or Qt for Python. The former is not free for commercial projects. The latter is less mature, but can be used for free.
Complete list is at http://wiki.python.org/moin/GuiProgramming
Single executable (all platforms)
PyInstaller - the most active(Could also be used with PyQt)
fbs - if you chose Qt above
Single executable (Windows)
py2exe - used to be the most popular
Single executable (Linux)
Freeze - works the same way like py2exe but targets Linux platform
Single executable (Mac)
py2app - again, works like py2exe but targets Mac OS
Another system (not mentioned in the accepted answer yet) is PyInstaller, which worked for a PyQt project of mine when py2exe would not. I found it easier to use.
http://www.pyinstaller.org/
Pyinstaller is based on Gordon McMillan's Python Installer. Which is no longer available.
An alternative tool to py2exe is bbfreeze which generates executables for windows and linux. It's newer than py2exe and handles eggs quite well. I've found it magically works better without configuration for a wide variety of applications.
There's also PyGTK, which is basically a Python wrapper for the Gnome Toolkit. I've found it easier to wrap my mind around than Tkinter, coming from pretty much no knowledge of GUI programming previously. It works pretty well and has some good tutorials. Unfortunately there isn't an installer for Python 2.6 for Windows yet, and may not be for a while.
Since python is installed on nearly every non-Windows OS by default now, the only thing you really need to make sure of is that all of the non-standard libraries you use are installed.
Having said that, it is possible to build executables that include the python interpreter, and any libraries you use. This is likely to create a large executable, however.
MacOS X even includes support in the Xcode IDE for creating full standalone GUI apps. These can be run by any user running OS X.
For the GUI itself:
PyQT is pretty much the reference.
Another way to develop a rapid user interface is to write a web app,
have it run locally and display the app in the browser.
Plus, if you go for the Tkinter option suggested by lubos hasko
you may want to try portablepy to have your app run on Windows environment
without Python.
I'm not sure that this is the best way to do it, but when I'm deploying Ruby GUI apps (not Python, but has the same "problem" as far as .exe's are concerned) on Windows, I just write a short launcher in C# that calls on my main script. It compiles to an executable, and I then have an application executable.
PySimpleGUI wraps tkinter and works on Python 3 and 2.7. It also runs on Qt, WxPython and in a web browser, using the same source code for all platforms.
You can make custom GUIs that utilize all of the same widgets that you find in tkinter (sliders, checkboxes, radio buttons, ...). The code tends to be very compact and readable.
#!/usr/bin/env python
import sys
if sys.version_info[0] >= 3:
import PySimpleGUI as sg
else:
import PySimpleGUI27 as sg
layout = [[ sg.Text('My Window') ],
[ sg.Button('OK')]]
window = sg.Window('My window').Layout(layout)
button, value = window.Read()
As explained in the PySimpleGUI Documentation, to build the .EXE file you run:
pyinstaller -wF MyGUIProgram.py
!!! KIVY !!!
I was amazed seeing that no one mentioned Kivy!!!
I have once done a project using Tkinter, although they do advocate that it has improved a lot, it still gives me a feel of windows 98, so I switched to Kivy.
I have been following a tutorial series if it helps...
Just to give an idea of how kivy looks, see this (The project I am working on):
And I have been working on it for barely a week now !
The benefits for Kivy you ask? Check this
The reason why I chose this is, its look and that it can be used in mobile as well.
# I'd use tkinter for python 3
import tkinter
tk = tkinter.Tk()
tk.geometry("400x300+500+300")
l = Label(tk,text="")
l.pack()
e = Entry(tk)
e.pack()
def click():
e['text'] = 'You clicked the button'
b = Button(tk,text="Click me",command=click)
b.pack()
tk.mainloop()
# After this I would you py2exe
# search for the use of this module on stakoverflow
# otherwise I could edit this to let you know how to do it
py2exe
Then you should use py2exe, for example, to bring in one folder all the files needed to run the app, even if the user has not python on his pc (I am talking of windows... for the apple os there is no need of an executable file, I think, as it come with python in it without any need of installing it.
Create this file
Create a setup.py
with this code:
from distutils.core import setup
import py2exe
setup(console=['l4h.py'])
save it in a folder
Put your program in the same folder of setup.py
put in this folder the program you want to make it distribuitable:
es: l4h.py
ps: change the name of the file (from l4h to anything you want, that is an example)
Run cmd from that folder (on the folder, right click + shift and choose start cmd here)
write in cmd:>python setup.py py2exe
in the dist folder there are all the files you need
you can zip it and distribute it
Pyinstaller
Install it from cmd
**
pip install pyinstaller
**
Run it from the cmd from the folder where the file is
**
pyinstaller file.py
**
Update
Read this post to make an exe on windows with pyinstaller the proper way and with one file and images in it https://pythonprogramming.altervista.org/auto-py-to-exe-only-one-file-with-images-for-our-python-apps/
You don't need to compile python for Mac/Windows/Linux. It is an interpreted language, so you simply need to have the Python interpreter installed on the system of your choice (it is available for all three platforms).
As for a GUI library that works cross platform, Python's Tk/Tcl widget library works very well, and I believe is sufficiently cross platform.
Tkinter is the python interface to Tk/Tcl
From the python project webpage:
Tkinter is not the only GuiProgramming
toolkit for Python. It is however the
most commonly used one, and almost the
only one that is portable between
Unix, Mac and Windows
You can use appJar for basic GUI development.
from appJar import gui
num=1
def myfcn(btnName):
global num
num +=1
win.setLabel("mylabel", num)
win = gui('Test')
win.addButtons(["Set"], [myfcn])
win.addLabel("mylabel", "Press the Button")
win.go()
See documentation at appJar site.
Installation is made with pip install appjar from command line.
There's three things you could do:
The first thing is to find a GUI Designer that can launch its code as standalone applications like .exe files. I use a version of MatDeck (for people using GUI Designers I recommend MD Python Designer) as I believe(I use another version so I'm not too sure.) it allows me to convert the code to a standalone applications and by having it as such, there is no need to install the software on every PC that's going to run the program.
The second option is partially bypassing the problem, launch the GUI as a web page. This would give you the most compatibility as most if not all OS can utilize it. Once again, you would need a GUI Designer that can convert its components into a web compatible format, I've done it once and I used the same version of MatDeck(Visionary Deck), I would not recommend MD Python Designer this time as I don't know if it can turn its GUIs into websites using web assembly whereas Visionary Deck I've tried and tested. As with all things there are most likely other software this is just one I use frequently because I work a lot with Mathematics and Physics.
The third option is also kind of bypassing the problem but do it in Tkinter and just ensure you have a Python IDE or just plain old Python and run the code, this will launch the GUI. This is a good solution and maybe the simplest but I wouldn't class it as the shortest or the best. If you only plan to switch between a few operating systems and computers this will probably be your best bet.