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#!/usr/bin/env python3
#Chapter 9 Project Renaming File Dates from American to European
import os
import re
import shutil
datePattern = re.compile(r'''^(.*?) #All text before date
((0|1)?\d)- #One or two month digits
((0|1|2|3)?\d)- #One or two digits for month
((19|20)\d\d) #Four digits for the year
(.*?)$ #all text after the date
''', re.VERBOSE)
for amerFilename in os.listdir('.'):
mo = datePattern.search(amerFilename)
if mo == None:
continue
beforePart = mo.group(1)
monthPart = mo.group(2)
dayPart = mo.group(4)
yearPart = mo.group(6)
afterPart = mo.group(8)
euroFilename = beforePart + dayPart + '-' + monthPart + '-' + yearPart + afterPart
absWorkingDir = os.path.abspath('.')
amerFilename = os.path.join(absWorkingDir, amerFilename)
euroFilename = os.path.join(absWorkingDir, euroFilename)
print('Renaming "%s" to "%s"...' % (amerFilename, euroFilename))
shutil.move(amerFilename, euroFilename)
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