old_contents: from __future__ import absolute_import
  
  from django.conf import settings
  from typing import Text
  
  from zerver.lib.utils import make_safe_digest
  
  import hashlib
  
  def gravatar_hash(email):
      # type: (Text) -> Text
      """Compute the Gravatar hash for an email address."""
      # Non-ASCII characters aren't permitted by the currently active e-mail
      # RFCs. However, the IETF has published https://tools.ietf.org/html/rfc4952,
      # outlining internationalization of email addresses, and regardless if we
      # typo an address or someone manages to give us a non-ASCII address, let's
      # not error out on it.
      return make_safe_digest(email.lower(), hashlib.md5)
  
  def user_avatar_hash(email):
      # type: (Text) -> Text
      # Salting the user_key may be overkill, but it prevents us from
      # basically mimicking Gravatar's hashing scheme, which could lead
      # to some abuse scenarios like folks using us as a free Gravatar
      # replacement.
      user_key = email.lower() + settings.AVATAR_SALT
      return make_safe_digest(user_key, hashlib.sha1)
  
  def user_avatar_path(user_profile):
      # type: (UserProfile) -> Text
      user_email_hash = user_avatar_hash(str(user_profile.email))
      return ('%s' % (user_email_hash))
  
new_contents: from __future__ import absolute_import
  
  from django.conf import settings
  from typing import Text
  
  from zerver.lib.utils import make_safe_digest
  
  if False:
      # Typing import inside `if False` to avoid import loop.
      from zerver.models import UserProfile
  
  import hashlib
  
  def gravatar_hash(email):
      # type: (Text) -> Text
      """Compute the Gravatar hash for an email address."""
      # Non-ASCII characters aren't permitted by the currently active e-mail
      # RFCs. However, the IETF has published https://tools.ietf.org/html/rfc4952,
      # outlining internationalization of email addresses, and regardless if we
      # typo an address or someone manages to give us a non-ASCII address, let's
      # not error out on it.
      return make_safe_digest(email.lower(), hashlib.md5)
  
  def user_avatar_hash(email):
      # type: (Text) -> Text
      # Salting the user_key may be overkill, but it prevents us from
      # basically mimicking Gravatar's hashing scheme, which could lead
      # to some abuse scenarios like folks using us as a free Gravatar
      # replacement.
      user_key = email.lower() + settings.AVATAR_SALT
      return make_safe_digest(user_key, hashlib.sha1)
  
  def user_avatar_path(user_profile):
      # type: (UserProfile) -> Text
      user_email_hash = user_avatar_hash(str(user_profile.email))
      return ('%s' % (user_email_hash))
  
subject: Add UserProfile import in avatar_hash.py.