code: a     :			Dict					    =						{
      """+""": lambda x, y: x + y,
      """-""": lambda x, y: x - y,
      """*""": lambda x, y: x * y,
      """/""": lambda x, y: x / y,
  }
  def 		snake_case__  (		lowercase				):
     return c.isdigit()
  def 		snake_case__  (		lowercase				):
     lowerCAmelCase_:       List[Any]         =  []
  
     # iterate over the string in reverse order
     for c in expression.split()[::-1]:
        # push operand to stack
        if is_operand(lowercase				):
           stack.append(int(lowercase				)				)
  
        else:
           # pop values from stack can calculate the result
           # push the result onto the stack again
           lowerCAmelCase_:       List[str]         =  stack.pop()
           lowerCAmelCase_:       Optional[int]         =  stack.pop()
           stack.append(calc[c](lowercase       ,							lowercase				)				)
  
     return stack.pop()
  
  
  # Driver code
  if __name__ == "__main__":
   a     :			Optional[int]					    =						"""+ 9 * 2 6"""
   print(evaluate(test_expression))
  
   a     :			Any					    =						"""/ * 10 2 + 4 1 """
   print(evaluate(test_expression))
style_context: import random
  
  class 				_lowercase						:
  
  
  
  
  
  
      '''simple docstring'''
  
  
  
  
      def __init__(						self					,	lowerCamelCase__					,	lowerCamelCase__   ):
         lowerCAmelCase_:       int         =  x
         lowerCAmelCase_:       List[str]         =  y
  
  
  
  
      def     _a						(						self   ):
         return (self.x**2 + self.y**2) <= 1
  
  
  
  
      @classmethod
      def     _a						(						cls   ):
         return cls(x=random.random()					,	y=random.random()   )
  
  
  
  
  
  def 		snake_case__  (		lowercase				):
     if number_of_simulations < 1:
        raise ValueError("At least one simulation is necessary to estimate PI."				)
  
     lowerCAmelCase_:       List[Any]         =  0
     for _ in range(lowercase				):
        lowerCAmelCase_:       Tuple         =  Point.random_unit_square()
  
        if random_point.is_in_unit_circle():
           number_in_unit_circle += 1
  
     return 4 * number_in_unit_circle / number_of_simulations
  
  
  if __name__ == "__main__":
   # import doctest
  
   # doctest.testmod()
   from math import pi
  
   a     :			Union[str, Any]					    =						"""Please enter the desired number of Monte Carlo simulations: """
   a     :			int					    =						estimate_pi(int(input(prompt).strip()))
   print(f'''An estimate of PI is {my_pi} with an error of {abs(my_pi - pi)}''')