Calculator can perform basic arithmetic operations using user-defined functions. Calculator can be created using classes for efficient code organization. Calculator can be implemented without functions for basic functionality
Button widget triggers functionality when pressed. Command parameter specifies function or method to be called. Style property provides improved button appearance
PhotoImage is Python Tkinter's built-in library for basic image display. Pillow module provides more features including image resizing. Pillow requires installation using pip or pip3
Original code provided syntax error in Python 3.3.1. PhotoImage class supports .gif, .pgm, and .png formats. Image format must match file path. PIL library installation required for Python 2.7
root.destroy() method closes window and exits mainloop. exit() method ends Python program execution. Custom quit_tk() function can be defined for window closure
Tkinter provides Python interface to Tcl/Tk GUI toolkit. Available on most Unix platforms including macOS and Windows. Supports both threaded and non-threaded Tcl/Tk versions. Not a thin wrapper but adds Pythonic logic