PM 2Ring questions

PM 2Ring answers

• Why is a duplicate object being added to my Python set when it shouldn't be?
• In python, why string.count() is faster than loop?
• Rotating a Square on Tkinter Canvas
• Replace combinations of characters
• First program using Functions
• Python Tkinter Grid Checkbox
• Measuring Elapsed time using Python 2.7 time module
• In Python, change the attributes of a class instance which is passed as input to __init__
• Pygame trigonometry: Following the hypotenuse?
• Channel mix with Pillow