
"""simple docstring"""


import re






def       _snake_case				(		snake_case__   :     str     ):
	return [char.split() for char in re.split(r'[^ a-z A-Z 0-9 \s]'	,      str_     )]






def       _snake_case				(		snake_case__   :     str     ):
	A						   =   split_input(str_     )
	return "".join(
	    [''.join([char.capitalize() for char in sub_str]     ) for sub_str in string_split]     )






def       _snake_case				(		snake_case__   :     str	,      snake_case__   :     bool	,      snake_case__   :     str     ):
	try:
		A						   =   split_input(a_     )
		if upper:
			A						   =   ''''''.join(
			    [
			        separator.join([char.upper() for char in sub_str]     )
			        for sub_str in string_split
			    ]     )
		else:
			A						   =   ''''''.join(
			    [
			        separator.join([char.lower() for char in sub_str]     )
			        for sub_str in string_split
			    ]     )
		return res_str
	except IndexError:
		return "not valid string"






def       _snake_case				(		snake_case__   :     str     ):
	return to_simple_case(a_     )






def       _snake_case				(		snake_case__   :     str     ):
	try:
		A						   =   to_simple_case(a_     )
		return res_str[0].lower() + res_str[1:]
	except IndexError:
		return "not valid string"






def       _snake_case				(		snake_case__   :     str	,      snake_case__   :     bool     ):
	return to_complex_case(a_	,      a_	,      '_'     )






def       _snake_case				(		snake_case__   :     str	,      snake_case__   :     bool     ):
	return to_complex_case(a_	,      a_	,      '-'     )


if __name__ == "__main__":
		__import__('''doctest''').testmod()

"""simple docstring"""


def       _snake_case				(		snake_case__   :     list	,      snake_case__   :     list	,      snake_case__   :     int     ):
	A						   =   len(snake_case__     )
	A						   =   [[0] * n for i in range(snake_case__     )]
	for i in range(snake_case__     ):
		A						   =   y_points[i]

	for i in range(2	,      snake_case__     ):
		for j in range(snake_case__	,      snake_case__     ):
			A						   =   (
			    (xa - x_points[j - i + 1]) * q[j][i - 1]
			    - (xa - x_points[j]) * q[j - 1][i - 1]
			) / (x_points[j] - x_points[j - i + 1])

	return [q[n - 1][n - 1], q]


if __name__ == "__main__":
		import doctest

		doctest.testmod()