More on fonts
Many Tkinter widgets let you specify custom font specifications either at the time of widget creation, or later by using the configure() option. For most cases, default fonts provide a standard look and feel. However, if you want to change font specifications, Tkinter lets you do so. There is one caveat though.
When you specify your own font, you need to make sure that it looks good on all the platforms where your program is intended to be deployed because a font might look good on a particular platform, but it may look awful on another platform. Unless you know what you are doing, it is always advisable to stick to Tkinter's default fonts.
Most platforms have their own set of standard fonts that are used by the platform's native widgets. So, rather than trying to reinvent the wheel on what looks good on a given platform or what would be available for a given platform, Tkinter assigns these standard platform-specific fonts to its widget, thus providing a native look and feel...
