Pythonでテキストファイルを結合する方法

Pythonコード:
import sys,os,msvcrt

def join(in_filenames, out_filename):
out_file = open(out_filename, ‘w+’)

err_files = []
for file in in_filenames:
try:
in_file = open(file, ‘r’)
out_file.write(in_file.read())
out_file.write(‘\n\n’)
in_file.close()
except IOError:
print ‘error joining’, file
err_files.append(file)
out_file.close()
print ‘joining completed. %d file(s) missed.’ % len(err_files)
print ‘output file:’, out_filename
if len(err_files) > 0:
print ‘missed files:’
print ‘——————————–‘
for file in err_files:
print file
print ‘——————————–‘

if __name__ == ‘__main__’:
print ‘スキャニング…’
in_filenames = []
file_count = 0
for file in os.listdir(sys.path[0]):
if file.lower().endswith(‘[all].txt’):
os.remove(file)
elif file.lower().endswith(‘.txt’):
in_filenames.append(file)
file_count = file_count + 1
if len(in_filenames) > 0:
print ‘——————————–‘
print ‘\n’.join(in_filenames)
print ‘——————————–‘
print ‘%d part(s) in total.’ % file_count
book_name = raw_input(‘本の名前を入力してください: ‘)
print ‘参加…’
join(in_filenames, book_name + ‘[ALL].TXT’)
else:
print ‘何も見つかりませんでした.’
msvcrt.getch()