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import os
import re
filenames = os.listdir('.')
file_tuples = []
re_file = re.compile(r'^(\d\d)_(.*)$')
for filename in filenames:
m = re_file.match(filename)
if m:
i = int(m.groups()[0])
t = i, filename
file_tuples.append(t)
file_tuples = sorted(file_tuples, key=lambda t: t[0])
for i, t in enumerate(file_tuples):
old_filename = file_tuples[i][1]
m = re_file.match(old_filename)
file_index = int(m.groups()[0])
filepart = m.groups()[1]
expected_index = i + 1
if file_index != expected_index:
new_filename = '%02d_%s' % (expected_index, filepart)
print 'rename %s to %s' % (old_filename, new_filename)
os.rename(old_filename, new_filename)
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