Arguments to Tkinter Variable trace Method Callbacks
Python's Tkinter variable classes (e.g., StringVar(), BooleanVar()) provide a trace method for tracking variable changes. This method accepts four arguments within its callback function: self, n, m, x.
Understanding the Argument Sequence
Example
Consider a BooleanVar() variable. When the callback function is executed, the arguments n, m, and x might appear as '', 'PYVAR0', and 'w', respectively. Here's what they mean:
Further Information
Tkinter wraps a Tcl/Tk interpreter. The comprehensive documentation for variable traces is available at http://tcl.tk/man/tcl8.5/TclCmd/trace.htm#M14. Note, however, that the Tkinter wrapper may occasionally modify the trace data.
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