TeXnic Center Starter

First tip: Compile (by clicking on F7) twice if working with a table of contents.

QDoubleValidator

QDoubleValidator is strange in that it seems to allow data that exceeds its specified range. Actually, it passes with the state 'intermediate', as opposed to 'valid' or 'invalid'. This may seem like a bug, and has been addressed in the C++ language here. Below is my PyQt implementation. It is done by subclassing QDoubleValidator, and making it more strict. (Finally it worked! =P)

class MyDoubleValidator(Qt.QDoubleValidator):

def __init__(self, bottom, top, decimals, parent = None):

Qt.QDoubleValidator.__init__(self, bottom, top, decimals, parent)

def validate(self, input, pos):

state, pos = Qt.QDoubleValidator.validate(self, input, pos)

if input.isEmpty() or input == '.':

return Qt.QValidator.Intermediate, pos

if state != Qt.QValidator.Acceptable:

return Qt.QValidator.Invalid, pos

return Qt.QValidator.Acceptable, pos

You then need to initialize an instance of this class and assign it to the widget, e.g. a lineEdit. E.g:

min = 0

max = 1000

no_decimals = 10

aValidator = MyDoubleValidator(min, max, no_decimals, myLineEdit)

myLineEdit.setValidator(aValidator)

Extra tags:

QDoubleValidator, bug, outside range, not working, QValidator, State

How to package the PyQt with VTK application

1. Download py2exe from http://sourceforge.net/projects/py2exe/files/
(Download the version that corresponds with your python version.)

2. Follow instructions from http://www.py2exe.org/index.cgi/Tutorial

Basically, you need a file called setup.py, like this:

from distutils.core import setup

import py2exe

setup(console=['runui12.py'])

Then run this line in command line:

vtkpython setup.py py2exe

Extra Tags: How to make executable run standalone pyqt qt vtk app application

Navigate Faster with your Keyboard

Hope some of these will help you to navigate faster in typed text. (Thanks to Eugene Isack and Lydia. ^ ^)

Moving Cursor
Home................ = to the beginning of line
End................... = to the end of line
Ctrl + Home..... = to the beginning of page
Ctrl + End........ = to the end of page

Deleting
Ctrl + Backspace......= word to the left
Ctrl + Delete.............= word to the right

Selecting
Shift + left arrow...........................= one character to the left
Ctrl + Shift + left/right arrow......= word to the left/right
Shift + Home/End.........................= Select all till Start/Finish

Internet Browser
Ctrl + Enter..................= when entering URLs automatically adds www & .com
Ctrl + w.........................= close window/tab
Alt + Tab.......................= next tab
Alt + Shift + Tab...........= previous tab
Alt + d.........................= Go to url box
Alt + g..........................=Go to search box

Windows

Windows + D.........= minimises all windows

Windows + E.........= brings up my computer

Python loop and modify list

When working with lists, don't modify them as you iterate through.

For example, if you need to remove empty strings in your list, don't delete the strings as you find them, as your loop is still iterating, and some items might be looped through twice, or not at all.

Solution:

Write out another list, or another variable to keep track of what your loop is trying to achieve.

Extra Tags:

Remove whitespace empty string list iterate modify for loop