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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def readWindowsFile(wfile):
 """" reading file with windows wfile File containing window info """

    window_file = wfile+'.wnd'
    assert os.path.exists(window_file), '%s is missing.'%window_file
    rv = SP.loadtxt(window_file)
    return rv