python rename and sort file or directry

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#/usr/bin/env pythonimport sysimport osif __name__ == "__main__":    BASE_PATH="software/codeblock/video/temp/highway/groundtruth/"    file = open("software/codeblock/video/boats/csv", "w")    SEPARATOR=";"    label = 0    tempstr = ""    for dirname, dirnames, filenames in os.walk(BASE_PATH):        filenames.sort()        for i in filenames:            print(BASE_PATH + i)            tempstr = str(label)            os.renames(BASE_PATH + i,BASE_PATH + tempstr + ".png")