parameters: (version)
return_statement: return "".join(parts)
docstring: This is very similar to Version.__str__, but has one subtle differences
      with the way it handles the release segment.
docstring_summary: This is very similar to Version.__str__, but has one subtle differences
      with the way it handles the release segment.
docstring_tokens: This is very similar to Version . __str__ but has one subtle differences with the way it handles the release segment .
function: def canonicalize_version(version):
      """
      This is very similar to Version.__str__, but has one subtle differences
      with the way it handles the release segment.
      """
  
      try:
          version = Version(version)
      except InvalidVersion:
          # Legacy versions cannot be normalized
          return version
  
      parts = []
  
      # Epoch
      if version.epoch != 0:
          parts.append("{0}!".format(version.epoch))
  
      # Release segment
      # NB: This strips trailing '.0's to normalize
      parts.append(re.sub(r"(\.0)+$", "", ".".join(str(x) for x in version.release)))
  
      # Pre-release
      if version.pre is not None:
          parts.append("".join(str(x) for x in version.pre))
  
      # Post-release
      if version.post is not None:
          parts.append(".post{0}".format(version.post))
  
      # Development release
      if version.dev is not None:
          parts.append(".dev{0}".format(version.dev))
  
      # Local version segment
      if version.local is not None:
          parts.append("+{0}".format(version.local))
  
      return "".join(parts)
function_tokens: def canonicalize_version ( version ) : try : version = Version ( version ) except InvalidVersion : # Legacy versions cannot be normalized return version parts = [ ] # Epoch if version . epoch != 0 : parts . append ( "{0}!" . format ( version . epoch ) ) # Release segment # NB: This strips trailing '.0's to normalize parts . append ( re . sub ( r"(\.0)+$" , "" , "." . join ( str ( x ) for x in version . release ) ) ) # Pre-release if version . pre is not None : parts . append ( "" . join ( str ( x ) for x in version . pre ) ) # Post-release if version . post is not None : parts . append ( ".post{0}" . format ( version . post ) ) # Development release if version . dev is not None : parts . append ( ".dev{0}" . format ( version . dev ) ) # Local version segment if version . local is not None : parts . append ( "+{0}" . format ( version . local ) ) return "" . join ( parts )