old_contents: from functools import wraps
  
  from flask import g, flash, redirect, url_for, request
  
  def requires_login(f):
      @wraps(f)
      def decorated_function(*args, **kwargs):
          if g.user is None:
              flash(u'You need to be signed in for this page.')
              return redirect(url_for('users.login', next=request.path))
          return f(*args, **kwargs)
      return decorated_function
new_contents: from functools import wraps
  
  from flask import g, flash, redirect, url_for, request
  
  """
  def requires_login(f):
      @wraps(f)
      def decorated_function(*args, **kwargs):
          if g.user is None:
              flash(u'You need to be signed in for this page.')
              return redirect(url_for('users.login', next=request.path))
          return f(*args, **kwargs)
      return decorated_function
  """
subject: hide for now