What you need a module called subprocess, which will allow you to run files, from within your python code, by using Popen.
The code for running the file will look something like this, once you import the module:
from subprocess import Popen
p = Popen("smileA.py")
stdout, stderr = p.communicate()
If that's what you mean by "Running it in Tkinter", as in, running that code, while building a GUI in Tkinter in the same file.
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