[pyqt/en] I've done a small example for getting started with the QT framework in python (#2364)

* Added a pyqt example page

* Fixed a spelling mistake on the pyqt examples

* Added link to C++ version author

* Fixed a truncation of text issue

* Ready to submit initial version for PR

* Too many new lines

1 files changed, 84 insertions, 0 deletions

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+---
+category: tool
+tool: Qt Framework
+language: pyqt
+filename: learnqt.py
+contributors:
+    - ["Nathan Hughes", "https://github.com/sirsharpest"]
+lang: en
+---
+
+**Qt** is a widely-known framework for developing cross-platform software that can be run on various software and hardware platforms with little or no change in the code, while having the power and speed of native applications. Though **Qt** was originally written in *C++*.
+
+
+This is an adaption on the C++ intro to QT by [Aleksey Kholovchuk](https://github.com/vortexxx192
+), some of the code examples should result in the same functionality
+this version just having been done using pyqt! 
+
+```Python
+import sys
+from PyQt4 import QtGui
+	
+def window():
+	# Create an application object 
+    app = QtGui.QApplication(sys.argv)
+	# Create a widget where our label will be placed in
+    w = QtGui.QWidget()
+	# Add a label to the widget 
+    b = QtGui.QLabel(w)
+	# Set some text for the label 
+    b.setText("Hello World!")
+	# Give some size and placement information 
+    w.setGeometry(100, 100, 200, 50)
+    b.move(50, 20)
+	# Give our window a nice title 
+    w.setWindowTitle("PyQt")
+	# Have everything display
+    w.show()
+	# Execute what we have asked for, once all setup
+    sys.exit(app.exec_())
+
+if __name__ == '__main__':
+    window()
+
+```
+
+In order to get some of the more advanced features in **pyqt** we need to start looking at building additional elements. 
+Here we show how to introduce a dialog popup box, useful for asking the user to confirm a decision or to provide information.
+
+```Python 
+import sys
+from PyQt4.QtGui import *
+from PyQt4.QtCore import *
+
+
+def window():
+    app = QApplication(sys.argv)
+    w = QWidget()
+    # Create a button and attach to widget w
+    b = QPushButton(w)
+    b.setText("Press me")
+    b.move(50, 50)
+    # Tell b to call this function when clicked
+    # notice the lack of "()" on the function call
+    b.clicked.connect(showdialog)
+    w.setWindowTitle("PyQt Dialog")
+    w.show()
+    sys.exit(app.exec_())
+	
+# This function should create a dialog window with a button
+# that waits to be clicked and then exits the program
+def showdialog():
+    d = QDialog()
+    b1 = QPushButton("ok", d)
+    b1.move(50, 50)
+    d.setWindowTitle("Dialog")
+    # This modality tells the popup to block the parent whilst it's active
+    d.setWindowModality(Qt.ApplicationModal)
+    # On click I'd like the entire process to end
+    b1.clicked.connect(sys.exit)
+    d.exec_()
+
+if __name__ == '__main__':
+    window()
+```