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I have been trying to transition to Python recently but my brain isn't working well with it.
I really can't find what is the problem.
window.py
import tkinter as tk
class Window(tk.Tk):
def __init__(self):
super(Window, self).__init__()
main.py
from window import Window
win = Window()
win.mainloop()
Error message:
File "main.py", line 3, in <module>
win = Window()
File "window.py", line 5, in __init__
super(Window, self).__init__()
TypeError: super() argument 1 must be type, not classobj
Am I just being dumb?
Thank you.
If you are using a recent python version super itself needs no arguments:
class Window(tk.Tk):
def __init__(self):
super().__init__()
I am so sorry everybody ran the file with python 2.
Just typed "python3 main.py" rather than "python main.py"
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enter image description hereI'm writing a simple code for executing an application in python kivy module I use Pycharm, the syntax is okay but its returning an error saying:
File "C:\Users\USER\PycharmProjects\pythonProject7\main.py", line 12, in <module>
TestNas().run()
TypeError: TestNas() missing 1 required positional argument: 'app'
I was expecting it to start the simple Kivy Gui but it did not.
import kivy
from kivy.app import App
from kivy.uix.label import Label
def TestNas(app):
def build(self):
return Label(Text="Test this app")
if __name__ == '__main__':
TestNas().run()
First of all TestNas() should be a class and I'm guessing it needs to be a subclass of App() that you imported. So change TestNas() to a class and capitalize App().
I think this is the code you need:
import kivy
from kivy.app import App
from kivy.uix.label import Label
class TestNas(App):
def build(self):
return Label(Text="Test this app")
if __name__ == '__main__':
TestNas().run()
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from tkinter import *
root = Tk()
mylabel = label(root, text = "What's up?")
mylabel.pack()
root.mainloop()
This is the code I used in Visual code studio. And it shows me an error:
NameError: name 'label' is not defined
What do I need to change to make this work?
pls change your code like this
mylabel = Label(root,text = '')
you should use Lable instead label
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I am using the following code trying to show my Qt window:
from PyQt5 import QtCore, QtGui, QtWidgets, uic
class MyWindow(QtWidgets.QMainWindow):
def __init__(self):
super(MyWindow, self).__init__()
uic.loadUI('app.ui', self)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
window = MyWindow()
window.show()
sys.exit(app.exec_)
Unfortunately, I always receive the error
AttributeError: module 'PyQt5.uic' has no attribute 'loadUI'
I have already checked whether I accidentally used Qt4 attributes, but could not find any.
It should be load.Ui, not load.UI.
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I have this:
__author__ = 'User'
from kivy.app import App
from kivy.uix.button import Label
class Hello2(App):
def build(self):
return Label()
if __name__=="__main__":
Hello2().run()
But I get an error on this line:
return Label()
And I dont know why it is an error
I have it now like this:
__author__ = 'User'
from kivy.app import App
from kivy.uix.button import Label
class Hello2(App):
def build(self):
return Label()
if __name__=="__main__":
Hello2().run()
but still the same error
Your indentation is wrong. Try reindenting like this:
__author__ = 'User'
from kivy.app import App
from kivy.uix.button import Label
class Hello2(App):
def build(self):
return Label()
if __name__=="__main__":
Hello2().run()
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Closed 9 years ago.
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I'm brand new to GUI programming under Python and just got the book "Rapid GUI Programming with Python and QT" by Summerfield. The very first simple example ("pop-up alert in 25 lines") on page 112 works, but my attempt to exactly replicate the second example ("an expression evaluator in 30 lines") on page 116 produces only a blank window, with no visible fields for either entry or output and not even a window title. This is under Mac OS X 10.8.5 using the latest Enthought Canopy 64-bit Python installation (1.2.0.1610)
The complete contents of PyQtdemo.pyw is
from __future__ import division
import sys
from math import *
from PyQt4.QtCore import *
from PyQt4.QtGui import *
class Form(QDialog):
def _init__(self, parent=None):
super(Form,self).__init__(parent)
self.browser = QTextBrowser()
self.lineedit = QLineEdit("Type an expression and press Enter")
self.lineedit.selectAll()
layout = QVBoxLayout()
layout.addWidget(self.browser)
layout.addWidget(self.lineedit)
self.setLayout(layout)
self.lineedit.setFocus()
self.connect(self.lineedit, SIGNAL("returnPressed()"), self.updateUi)
self.setWindowTitle("Calculate")
def updateUi(self):
try:
text = unicode(self.lineedit.text())
self.browser.append("%s = <b>%s</b>" % (text, eval(text)))
except:
self.browser.append("<font color=red>%s is invalid!</font>" % text)
app = QApplication(sys.argv)
print dir(app)
form = Form()
form.show()
app.exec_()
It seems to me there are only the following possibilities:
there's a typo in my code that I've overlooked;
there's something wrong with how I'm invoking the script (e.g., "python PyQtdemo.pyw");
there's something wrong with my PyQt 4.10.3-1 installation;
there's an error in the book.
It's a typo in your code.
The Form.__init__ method is missing an initial underscore, and so it never gets called.
(PS: This also explains why the incorrect indentation of the updateUi method doesn't raise an AttributeError when it's referenced in self.connect).