code: 
  
  
  
  
  '''simple docstring'''
  
  
  
  
  
  import requests
  
  try:
         from django.contrib.auth import authenticate, login
         from django.shortcuts import redirect, render
  except ImportError:
         A			=	print
  
  
  def 				UpperCamelCase	(  snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     SCREAMING_SNAKE_CASE__			:				Dict       						= '''secretKey'''
     SCREAMING_SNAKE_CASE__			:				Union[str, Any]       						= '''https://www.google.com/recaptcha/api/siteverify'''
  
     # when method is not POST, direct user to login page
     if request.method != "POST":
        return render(snake_case	,     '''login.html'''   )
  
     # from the frontend, get username, password, and client_key
     SCREAMING_SNAKE_CASE__			:				List[str]       						= request.POST.get('''username'''   )
     SCREAMING_SNAKE_CASE__			:				Any       						= request.POST.get('''password'''   )
     SCREAMING_SNAKE_CASE__			:				List[str]       						= request.POST.get('''g-recaptcha-response'''   )
  
     # post recaptcha response to Google's recaptcha api
     SCREAMING_SNAKE_CASE__			:				int       						= requests.post(snake_case	,     data={'''secret''': secret_key, '''response''': client_key}   )
     # if the recaptcha api verified our keys
     if response.json().get('''success'''	,     snake_case   ):
        # authenticate the user
        SCREAMING_SNAKE_CASE__			:				Optional[Any]       						= authenticate(snake_case	,     username=snake_case	,     password=snake_case   )
        if user_in_database:
           login(snake_case	,     snake_case   )
           return redirect('''/your-webpage'''   )
     return render(snake_case	,     '''login.html'''   )
  
  
style_context: 
  
  
  
  
  '''simple docstring'''
  
  
  
  
  
  lowercase__			=	{
      '''+''': lambda x, y: x + y,
      '''-''': lambda x, y: x - y,
      '''*''': lambda x, y: x * y,
      '''/''': lambda x, y: x / y,
  }
  
  
  def 				UpperCamelCase	(  snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     return c.isdigit()
  
  
  def 				UpperCamelCase	(  snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     SCREAMING_SNAKE_CASE__			:				Union[str, Any]       						= []
  
     # iterate over the string in reverse order
     for c in expression.split()[::-1]:
        # push operand to stack
        if is_operand(snake_case   ):
           stack.append(int(snake_case   )   )
  
        else:
           # pop values from stack can calculate the result
           # push the result onto the stack again
           SCREAMING_SNAKE_CASE__			:				Dict       						= stack.pop()
           SCREAMING_SNAKE_CASE__			:				Any       						= stack.pop()
           stack.append(calc[c](snake_case	,     snake_case   )   )
  
     return stack.pop()
  
  
  # Driver code
  if __name__ == "__main__":
         lowercase__			=	'''+ 9 * 2 6'''
         print(evaluate(test_expression))
  
         lowercase__			=	'''/ * 10 2 + 4 1 '''
         print(evaluate(test_expression))
  
  