An interactive Python shell plugin for PyQt & PySide applications
Project description
Console plugin for Python Qt applications
Adeqt gives you a Python shell inside your Qt applications using PyQt or PySide. You can use this for simple debugging or as a 'power user' feature.
How to use
Install the adeqt package: pip install adeqt
.
If you don't want to add any dependencies, you can copy adeqt.py
into your own
project instead. You might also want to change the imports to use your chosen
Python Qt package directly (it normally uses the
QtPy compatibility layer).
Connect up a menu entry or a keyboard shortcut to open the Adeqt window like this:
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QKeySequence
from PyQt5.QtWidgets import QAction, QMainWindow, QShortcut
class MainWindow(QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
# ... Other application setup ...
# Menu entry
adeqt_action = QAction("Python console", self)
adeqt_action.triggered.connect(self.show_adeqt)
some_menu.addAction(adeqt_action)
# Keyboard shortcut (here F12)
adeqt_shortcut = QShortcut(QKeySequence(Qt.Key_F12), self)
adeqt_shortcut.activated.connect(self.show_adeqt)
adeqt_window = None
def show_adeqt(self):
# Change to 'from .adeqt ...' if you copy adeqt into your application
from adeqt import AdeqtWindow
if self.adeqt_window is None:
self.adeqt_window = AdeqtWindow({'window': self}, parent=self)
self.adeqt_window.show()
The dictionary you pass to AdeqtWindow
defines variables that will be
available in the console. This will normally have at least the main
window/application object, and any other objects you want convenient access to.
When using the console window:
- Ctrl-Enter executes the existing code
- Tab shows available completions
- Ctrl-W closes the console window
Design & limitations
-
Adeqt is deliberately simple, providing a basic console experience. It's meant to be easy to copy into your project and easy to modify as required.
-
It doesn't protect anything from malicious users. Users running a Python application can probably do anything anyway, but Adeqt makes it very easy. If you need to restrict what users can do, think about security at other levels.
-
User code runs in the main thread. This makes it easy to safely call Qt methods, but if you run something slow from the console, the GUI locks up until it finishes.
Alternatives
The Jupyter Qt Console can be embedded in an application. This is a much more featureful console - with rich output, syntax highlighting, better tab completions, etc. - but it's designed to run code in a separate 'kernel' process. Running the code in the same process as the console ('inprocess') is possible, but not well supported. It also needs quite a few dependencies.
Debuggers can pause your code during execution and give you a place to run commands and explore the stack. Some modern debuggers can also 'attach' to a process which wasn't started in a debugger. A good debugger is strictly more powerful than Adeqt, but that power also makes it trickier to use.
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