code: 
  
  
  
  def 			__lowercase     (				a__     )       ->				str:
  							__SCREAMING_SNAKE_CASE								=      1
  							__SCREAMING_SNAKE_CASE								=      0
  							__SCREAMING_SNAKE_CASE								=      1
  							__SCREAMING_SNAKE_CASE								=      1
  							__SCREAMING_SNAKE_CASE								=      3
  							__SCREAMING_SNAKE_CASE								=      3
  							__SCREAMING_SNAKE_CASE								=      limit
  							__SCREAMING_SNAKE_CASE								=      0
  
  							__SCREAMING_SNAKE_CASE								=      ''
  							while counter != decimal + 1:
  														if 4 * q + r - t < n * t:
  																					result += str(a__     )
  																					if counter == 0:
  																												result += "."
  
  																					if decimal == counter:
  																												break
  
  																					counter += 1
  																					__SCREAMING_SNAKE_CASE								=      10 * (r - n * t)
  																					__SCREAMING_SNAKE_CASE								=      ((10 * (3 * q + r)) // t) - 10 * n
  																					q *= 10
  																					__SCREAMING_SNAKE_CASE								=      nr
  														else:
  																					__SCREAMING_SNAKE_CASE								=      (2 * q + r) * l
  																					__SCREAMING_SNAKE_CASE								=      (q * (7 * k) + 2 + (r * l)) // (t * l)
  																					q *= k
  																					t *= l
  																					l += 2
  																					k += 1
  																					__SCREAMING_SNAKE_CASE								=      nn
  																					__SCREAMING_SNAKE_CASE								=      nr
  							return result
  
  
  
  
  
  
  def 			__lowercase     (				)       ->				None:
  							print(f"""{calculate_pi(50     ) = }"""     )
  							import doctest
  
  							doctest.testmod()
  
  
  if __name__ == "__main__":
  			main()
  
  
  
  
  
  
  
style_context: 
  
  
  
  from __future__ import annotations
  
  class      UpperCAmelCase_						:
  
  						'''simple docstring'''
  
  
  
  
  						def __init__(					self   ,							_A	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      value
  													__SCREAMING_SNAKE_CASE								=      None
  													__SCREAMING_SNAKE_CASE								=      None
  
  
  
  
  
  
  
  class      UpperCAmelCase_						:
  
  						'''simple docstring'''
  
  
  
  
  						UpperCamelCase__    :				int
  
  
  
  
  
  
  						def __init__(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      0
  
  
  
  
  
  
  						def  _A			(					self   ,							_A   ,							_A	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													if node is None:
  																				return
  
  													if path_sum == self.target:
  																				self.paths += 1
  
  													if node.left:
  																				self.depth_first_search(node.left   ,							path_sum + node.left.value	)
  													if node.right:
  																				self.depth_first_search(node.right   ,							path_sum + node.right.value	)
  
  
  
  
  
  
  						def  _A			(					self   ,							_A   ,							_A = None	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													if node is None:
  																				return 0
  													if target is not None:
  																				__SCREAMING_SNAKE_CASE								=      target
  
  													self.depth_first_search(_A   ,							node.value	)
  													self.path_sum(node.left	)
  													self.path_sum(node.right	)
  
  													return self.paths
  
  
  if __name__ == "__main__":
  			import doctest
  
  			doctest.testmod()
  
  
  
  
  
  
  