code: def get_language_pairs(self, train_langs=None):
          '''
              Returns the language pairs available on unbabel
          '''
          if train_langs is None:
              result = self.api_call('language_pair/')
          else:
              result = self.api_call(
                  'language_pair/?train_langs={}'.format(train_langs))
          try:
              langs_json = json.loads(result.content)
              if 'error' in langs_json:
                  return []
              languages = [LangPair(Language(
                  shortname=lang_json["lang_pair"]["source_language"][
                      "shortname"],
                  name=lang_json["lang_pair"]["source_language"]["name"]),
                  Language(shortname=lang_json["lang_pair"][
                      "target_language"]["shortname"],
                           name=lang_json["lang_pair"][
                               "target_language"]["name"])
              ) for lang_json in langs_json["objects"]]
          except Exception, e:
              log.exception("Error decoding get language pairs")
              raise e
          return languagef get_language_pairs(self, train_langs=None):
          '''
              Returns the language pairs available on unbabel
          '''
          if train_langs is None:
              result = self.api_call('language_pair/')
          else:
              result = self.api_call(
                  'language_pair/?train_langs={}'.format(train_langs))
          try:
              langs_json = json.loads(result.content)
              if 'error' in langs_json:
                  return []
              languages = [LangPair(Language(
                  shortname=lang_json["lang_pair"]["source_language"][
                      "shortname"],
                  name=lang_json["lang_pair"]["source_language"]["name"]),
                  Language(shortname=lang_json["lang_pair"][
                      "target_language"]["shortname"],
                           name=lang_json["lang_pair"][
                               "target_language"]["name"])
              ) for lang_json in langs_json["objects"]]
          except Exception, e:
              log.exception("Error decoding get language pairs")
              raise e
          return languages
docs: Returns the language pairs available on unbabel