The following methods are used by Tkinter's inner workings. Don't use these unless you know exactly what you are doing, and why you should do that.
getboolean(s). Convert a string to a boolean (flag) value, using Tcl's conventions.
getdouble(s). Convert a string to a floating point value, using Tcl's conventions. In practice, this is equivalent to float and string.atof.
getint(s). Convert a string to an integer point value, using Tcl's conventions. In practice, this is equivalent to int and string.atoi.
register(callback). Register a Tcl to Python callback. Returns the name of a Tcl wrapper procedure. When that procedure is called from a Tcl program, it will call the corresponding Python function with the arguments given to the Tcl procedure. Values returned from the Python callback are converted to strings, and returned to the Tcl program.
winfo_atom(string). Map the given to a unique integer. Everytime you call this method with the same string, the same integer will be returned.
winfo_atomname(id). Return the string corresponding to the given integer (obtained by a call to winfo_atom). If the integer isn't in use, Tkinter raises a TclError exception. Note that Tkinter predefines a bunch of integers (typically 1-80 or so). If you're curious, you can use winfo_atomname to find out what they are used for.