os.path.getsize(Inputdirectory + '\\' + Filename) works, but
os.path.getsize(Inputdirectory + '\\' + Filename.split('.') + '.ext')
Fails reporting "no such file or directory
InputDirectory\\Filename.ext".
os.path.getsize(Inputdirectory + r'\' + Filename.split('.') + '.ext')
generates a syntax error.
Earl Eiland