old_contents: #!/usr/bin/env python3
  # #############################################################################
  # Copyright (c) 2018-present    lzutao <taolzu(at)gmail.com>
  # All rights reserved.
  #
  # This source code is licensed under both the BSD-style license (found in the
  # LICENSE file in the root directory of this source tree) and the GPLv2 (found
  # in the COPYING file in the root directory of this source tree).
  # #############################################################################
  import re
  import sys
  
  
  def find_version(filepath):
    version_file_data = None
    with open(filepath) as fd:
      version_file_data = fd.read()
  
    patterns = r"""#\s*define\s+ZSTD_VERSION_MAJOR\s+([0-9]+)
  #\s*define\s+ZSTD_VERSION_MINOR\s+([0-9]+)
  #\s*define\s+ZSTD_VERSION_RELEASE\s+([0-9]+)
  """
    regex = re.compile(patterns, re.MULTILINE)
    version_match = regex.search(version_file_data)
    if version_match:
      return version_match.groups()
    raise Exception("Unable to find version string.")
  
  
  def main():
    import argparse
    parser = argparse.ArgumentParser(description='Print zstd version from lib/zstd.h')
    parser.add_argument('file', help='path to lib/zstd.h')
    args = parser.parse_args()
    filepath = args.file
    version_tup = find_version(filepath)
    print('.'.join(version_tup))
  
  
  if __name__ == '__main__':
    main()
  
new_contents: #!/usr/bin/env python3
  # #############################################################################
  # Copyright (c) 2018-present    lzutao <taolzu(at)gmail.com>
  # All rights reserved.
  #
  # This source code is licensed under both the BSD-style license (found in the
  # LICENSE file in the root directory of this source tree) and the GPLv2 (found
  # in the COPYING file in the root directory of this source tree).
  # #############################################################################
  import re
  
  
  def find_version_tuple(filepath):
    version_file_data = None
    with open(filepath) as fd:
      version_file_data = fd.read()
  
    patterns = r"""#\s*define\s+ZSTD_VERSION_MAJOR\s+([0-9]+)
  #\s*define\s+ZSTD_VERSION_MINOR\s+([0-9]+)
  #\s*define\s+ZSTD_VERSION_RELEASE\s+([0-9]+)
  """
    regex = re.compile(patterns, re.MULTILINE)
    version_match = regex.search(version_file_data)
    if version_match:
      return version_match.groups()
    raise Exception("Unable to find version string")
  
  
  def main():
    import argparse
    parser = argparse.ArgumentParser(description='Print zstd version from lib/zstd.h')
    parser.add_argument('file', help='path to lib/zstd.h')
    args = parser.parse_args()
    version_tuple = find_version_tuple(args.file)
    print('.'.join(version_tuple))
  
  
  if __name__ == '__main__':
    main()
  
subject: Remove unused sys import