old_contents: """PyZMQ and 0MQ version functions."""
  
  #-----------------------------------------------------------------------------
  #  Copyright (C) 2013 Brian Granger, Min Ragan-Kelley
  #
  #  This file is part of pyzmq
  #
  #  Distributed under the terms of the New BSD License.  The full license is in
  #  the file COPYING.BSD, distributed as part of this software.
  #-----------------------------------------------------------------------------
  
  #-----------------------------------------------------------------------------
  # Imports
  #-----------------------------------------------------------------------------
  
  import re
  
  from .backend import zmq_version_info
  
  #-----------------------------------------------------------------------------
  # Code
  #-----------------------------------------------------------------------------
  
  __version__ = '13.0dev'
  __revision__ = ''
  
  def pyzmq_version():
      """return the version of pyzmq as a string"""
      if __revision__:
          return '@'.join([__version__,__revision__[:6]])
      else:
          return __version__
  
  def pyzmq_version_info():
      """return the pyzmq version as a tuple of numbers
      
      If pyzmq is a dev version, the patch-version will be `inf`.
      
      This helps comparison of version tuples in Python 3, where str-int
      comparison is no longer legal for some reason.
      """
      parts = re.findall('[0-9]+', __version__)
      parts = [ int(p) for p in parts ]
      if 'dev' in __version__:
          parts.append(float('inf'))
      return tuple(parts)
  
  
  def zmq_version():
      """return the version of libzmq as a string"""
      return "%i.%i.%i" % zmq_version_info()
  
  
  __all__ = ['zmq_version', 'zmq_version_info',
             'pyzmq_version','pyzmq_version_info',
             '__version__', '__revision__'
  ]
  
  
new_contents: """PyZMQ and 0MQ version functions."""
  
  #-----------------------------------------------------------------------------
  #  Copyright (C) 2013 Brian Granger, Min Ragan-Kelley
  #
  #  This file is part of pyzmq
  #
  #  Distributed under the terms of the New BSD License.  The full license is in
  #  the file COPYING.BSD, distributed as part of this software.
  #-----------------------------------------------------------------------------
  
  #-----------------------------------------------------------------------------
  # Imports
  #-----------------------------------------------------------------------------
  
  import re
  
  from .backend import zmq_version_info
  
  #-----------------------------------------------------------------------------
  # Code
  #-----------------------------------------------------------------------------
  
  __version__ = '13.0.0-rc1'
  __revision__ = ''
  
  def pyzmq_version():
      """return the version of pyzmq as a string"""
      if __revision__:
          return '@'.join([__version__,__revision__[:6]])
      else:
          return __version__
  
  def pyzmq_version_info():
      """return the pyzmq version as a tuple of numbers
      
      If pyzmq is a dev version, the patch-version will be `inf`.
      
      This helps comparison of version tuples in Python 3, where str-int
      comparison is no longer legal for some reason.
      """
      parts = re.findall('[0-9]+', __version__)
      parts = [ int(p) for p in parts ]
      if 'dev' in __version__:
          parts.append(float('inf'))
      return tuple(parts)
  
  
  def zmq_version():
      """return the version of libzmq as a string"""
      return "%i.%i.%i" % zmq_version_info()
  
  
  __all__ = ['zmq_version', 'zmq_version_info',
             'pyzmq_version','pyzmq_version_info',
             '__version__', '__revision__'
  ]
  
  
subject: bump version to rc