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import os
import argparse
import re
parser = argparse.ArgumentParser()
parser.add_argument('index', type=int)
args = parser.parse_args()
insert_index = args.index
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):
if i + 1 != t[0]:
raise Exception('Expected index %s for %s' % (i, t[1]))
for i in range(insert_index - 1, len(file_tuples)):
old_filename = file_tuples[i][1]
m = re_file.match(old_filename)
filepart = m.groups()[1]
new_filename = '%02d_%s' % (i + 2, filepart)
print 'rename %s to %s' % (old_filename, new_filename)
os.rename(old_filename, new_filename)
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