old_contents: from itertools import count
  
  from django.db import models
  
  from pyvcs.backends import AVAILABLE_BACKENDS, get_backend
  from pyvcs.exceptions import CommitDoesNotExist, FileDoesNotExist, FolderDoesNotExist
  
  
  REPOSITORY_TYPES = zip(count(), AVAILABLE_BACKENDS.keys())
  
  class CodeRepository(models.Model):
      name = models.CharField(max_length=255)
      slug = models.SlugField()
  
      repository_type = models.IntegerField(choices=REPOSITORY_TYPES)
  
      location = models.CharField(max_length=255)
  
      def __unicode__(self):
          return "%s: %s" % (self.get_repository_type_display(), self.name)
  
      @models.permalink
      def get_absolute_url(self):
          return ('recent_commits', (), {'slug': self.slug})
  
      @property
      def repo(self):
          if hasattr(self, '_repo'):
              return self._repo
          self._repo = get_backend(self.get_repository_type_display()).Repository(self.location)
          return self._repo
  
      def get_commit(self, commit_id):
          try:
              return self.repo.get_commit_by_id(str(commit_id))
          except CommitDoesNotExist:
              return None
  
      def get_recent_commits(self, since=None):
          return self.repo.get_recent_commits(since=since)
  
      def get_folder_contents(self, path):
          try:
              return self.repo.list_directory(path)
          except FolderDoesNotExist:
              return None
  
      def get_file_contents(self, path):
          try:
              return self.repo.file_conents(path)
          except FileDoesNotExist:
              return None
  
new_contents: from itertools import count
  
  from django.db import models
  
  from pyvcs.backends import AVAILABLE_BACKENDS, get_backend
  from pyvcs.exceptions import CommitDoesNotExist, FileDoesNotExist, FolderDoesNotExist
  
  
  REPOSITORY_TYPES = zip(count(), AVAILABLE_BACKENDS.keys())
  
  class CodeRepository(models.Model):
      name = models.CharField(max_length=255)
      slug = models.SlugField()
  
      repository_type = models.IntegerField(choices=REPOSITORY_TYPES)
  
      location = models.CharField(max_length=255)
  
      def __unicode__(self):
          return "%s: %s" % (self.get_repository_type_display(), self.name)
  
      @models.permalink
      def get_absolute_url(self):
          return ('recent_commits', (), {'slug': self.slug})
  
      @property
      def repo(self):
          if hasattr(self, '_repo'):
              return self._repo
          self._repo = get_backend(self.get_repository_type_display()).Repository(self.location)
          return self._repo
  
      def get_commit(self, commit_id):
          try:
              return self.repo.get_commit_by_id(str(commit_id))
          except CommitDoesNotExist:
              return None
  
      def get_recent_commits(self, since=None):
          return self.repo.get_recent_commits(since=since)
  
      def get_folder_contents(self, path):
          try:
              return self.repo.list_directory(path)
          except FolderDoesNotExist:
              return None
  
      def get_file_contents(self, path):
          try:
              return self.repo.file_contents(path)
          except FileDoesNotExist:
              return None
  
subject: fix typo