code: 
  
  
  import re
  
  
  
  def   SCREAMING_SNAKE_CASE__						(							snake_case_	)			->							List[Any]:
  				def docstring_decorator(snake_case_	):
  								A__     :							List[Any]   				=fn.__doc__
  								A__     :							Optional[int]   				=func_doc.split('''\n'''	)
  								A__     :							List[Any]   				=0
  								while i < len(snake_case_	) and re.search(R'''^\s*Examples?:\s*$''',	lines[i]	) is None:
  												i += 1
  								if i < len(snake_case_	):
  												A__     :							Dict   				=example_docstring
  												A__     :							List[str]   				='''\n'''.join(snake_case_	)
  								else:
  												raise ValueError(
  												    f'The function {fn} should have an empty \'Examples:\' in its docstring as placeholder, '
  												    f'current docstring is:\n{func_doc}'	)
  								A__     :							Union[str, Any]   				=func_doc
  								return fn
  
  				return docstring_decorator
  
  
  
  
style_context: 
  
  
  def   SCREAMING_SNAKE_CASE__						(							snake_case_	)			->							int:
  				if number != int(snake_case_	):
  								raise ValueError('''factorial() only accepts integral values'''	)
  				if number < 0:
  								raise ValueError('''factorial() not defined for negative values'''	)
  				A__     :							Union[str, Any]   				=1
  				for i in range(1,	number + 1	):
  								value *= i
  				return value
  
  
  
  def   SCREAMING_SNAKE_CASE__						(							snake_case_	)			->							int:
  				if not isinstance(snake_case_,	snake_case_	):
  								raise ValueError('''factorial() only accepts integral values'''	)
  				if n < 0:
  								raise ValueError('''factorial() not defined for negative values'''	)
  				return 1 if n == 0 or n == 1 else n * factorial(n - 1	)
  
  
  if __name__ == "__main__":
  						import doctest
  
  						doctest.testmod()
  
  						__lowerCamelCase       :       Any				   =			int(input("Enter a positive integer: ").strip() or 0)
  						print(F"factorial{n} is {factorial(n)}")
  
  
  
  