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Python's os.path.realpath, when used with a substed drive on the Windows platform, don't resolve the substed path to the *real* path. 
For example creating a substed drive like this:
 subst z: C:\Users\Public\Desktop
and checking for the real path in python like this:
 import os
 myPath = "S:\\"
 print("Real path of: " + myPath + " is: " + os.path.realpath(myPath) )
prints
 Real path of: S:\ is: S:\
In the docs for the [subst][1] command, a substed drive is referred to as a *virtual* drive. Virtual, suggesting something being "not real", indicates that the Python *realpath* command is not working properly on Windows. 
 [1]: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/subst