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PyQt 5 Checkbox and Button text cut off

Illustration of Problem
I decided to work with PyQt and immediately encountered a problem and that is the text from my buttons is not displayed correctly and sometimes the buttons are not displayed completely.
import sys
from PyQt5 import QtWidgets
app = QtWidgets.QApplication(sys.argv)
window = QtWidgets.QMainWindow()
button = QtWidgets.QCheckBox(window)
button.setText("Hello World")
button.show()
window.show()
sys.exit(app.exec_())

PyQt5 don't update TextEdit and Label Text [duplicate]

I'm newbie.
I want to click a pushButton to open a new window and take text from main window lineEdit and copy to new pop-up window lineEdit.
So far I an create new window but can't access lineEdit. No errors, app is not responding.
This is what I have:
from PyQt5.QtWidgets import QApplication
from PyQt5 import uic
app = QApplication([]) #Main Window
ui = uic.loadUi(r"D:\UI_test\gui\main_gui_TT.ui")
appedit = QApplication([]) #Pop-up
uiedit = uic.loadUi(r"D:\UI_test\gui\input_TT.ui")
def edit1():
uiedit.show()
appedit.exec_()
uiedit.lineEdit_CC.setText('text') <-this line is a problem
ui.pushButton_1edit.pressed.connect(edit1)
ui.show()
app.exec_()
Please help what is wrong here?

You should only have a single QApplication even if you have many windows, considering the above the solution is:
from PyQt5.QtWidgets import QApplication
from PyQt5 import uic
app = QApplication([]) # Main Window
ui = uic.loadUi(r"D:\UI_test\gui\main_gui_TT.ui")
uiedit = uic.loadUi(r"D:\UI_test\gui\input_TT.ui")
def edit1():
uiedit.show()
uiedit.lineEdit_CC.setText("text")
ui.pushButton_1edit.pressed.connect(edit1)
ui.show()
app.exec_()

How do I run a Python Qt file in Ubuntu?

Here's the sample code that I want to run:
import sys
from PyQt4 import QtGui
app = QtGui.QApplication(sys.argv)
window = QtGui.QWidget()
window.setGeometry(0, 0, 500, 300)
window.setWindowTitle("Dummy PyQt file")
window.show()
The file is saved as sample.py. The following command isn't working:
$ python ./sample.py

You need to start the Qt event loop by calling app.exec_() once you have initialised the widgets and called show() on your main window.
import sys
from PyQt4 import QtGui
app = QtGui.QApplication(sys.argv)
window = QtGui.QWidget()
window.setGeometry(0, 0, 500, 300)
window.setWindowTitle("Dummy PyQt file")
window.show()
app.exec_()

You need to call app.exec_() to start the Qt event loop. Without it the program exits immediately before anything can be shown on screen.

Window is closing immediately after I run program in PyQt 4 (anaconda) [PyCharm 4.5]

So, I am trying to run a very simple program (a window) in Pycharm that is running anaconda 2.7 & PyQt4. Whenever I click the Run button it opens my program but closes the window too fast for me to even see it. May anyone, please help? Thank you!
P.S.
I'm very new to programming.
{__author__ = 'Jay'
import sys
from PyQt4 import QtGui
app = QtGui.QApplication(sys.argv)
window = QtGui.QWidget()
window.show()}

You need to block the execution of the program after you call window.show() so that the window object remains active otherwise it will be garbage collected. app.exec_() does this for you.
{__author__ = 'Jay'
import sys
from PyQt4 import QtGui
app = QtGui.QApplication(sys.argv)
window = QtGui.QWidget()
window.show()
app.exec_()} # added this line

Getting PySide Hello App to run under Canopy

A Canopy user here learning about PySide. When I run the demo code below, QApplication complains the event loop is already running.'
import sys
from PySide.QtCore import *
from PySide.QtGui import *
# Create a Qt application
#app = QApplication(sys.argv) #QApplication complains an instance already exists
app = QApplication.instance() #So we just ask for the instance.
#app.aboutToQuit.connect(app.deleteLater)
# Create a Label and show it
label = QLabel("Hello World")
label.show()
# Enter Qt application main loop
app.exec_()
sys.exit()
So how can I get this simple code to run?

Yes, Pylab is a mode of IPython which starts an event loop for the IPython front end so that you can interact at the IPython command line with your GUI.
Here's an simple example of code which will run with or without Pylab.
import sys
from PySide import QtGui
app = QtGui.QApplication.instance()
standalone = app is None
if standalone:
app = QtGui.QApplication(sys.argv)
wid = QtGui.QWidget()
wid.resize(250,150)
wid.setWindowTitle('Simple')
wid.show()
if standalone:
sys.exit(app.exec_())
else:
print "We're back with the Qt window still active"