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FYI, I'm currently using calls into Tkinter to get more detailed version info. Some methods work better than others... I've outlined my attempts below for reference (the last tcl_ver and tk_ver outputs are the ones I'm using, even though they are somewhat different in how they are written).
try: # Python2
 import Tkinter as tk
except ImportError: # Python3
 import tkinter as tk
root = tk.Tk()
tcl_ver = tk.TclVersion # Typical but low precsion
tcl_ver = tk.Tcl().eval('info patchlevel') # Works but uses eval()
tcl_ver = root.tcl.call('info', 'patchlevel') # Fails (AttributeError)
tcl_ver = tk.Tcl().call('info', 'patchlevel') # Works, using
tk_ver = tk.TkVersion # Typical but low precsion
tk_ver = tk.Tk().eval('info patchlevel') # Works but makes extra window, uses eval()
tk_ver = tk.Tk().call('info', 'patchlevel') # Works but makes extra window
tk_ver = root.tk.call('info', 'patchlevel') # Works, using