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import os


def twigFromPhp(filename):
    return filename.replace(".php", ".twig")


path = "C:/www/HCS/templates/pages"

for entry in os.scandir(path):
    fileExt = entry.name.split('.')[-1]
    if entry.is_file() and fileExt == 'php':
        fullPath_old = path + '/' + entry.name
        fullPath_new = path + '/' + twigFromPhp(entry.name)
        print(fullPath_old + '->' + fullPath_new)
        os.rename(fullPath_old, fullPath_new)