






"""simple docstring"""



from __future__ import annotations

from collections.abc import Iterator
from typing import Generic, TypeVar

_UpperCamelCase		:  Any						=		TypeVar('T')

class        a     (   Generic[T]	):







    def __init__(			self							,		_lowerCamelCase       ):
      lowercase							    =       data
      lowercase							    =       None







    def __str__(			self       ):
      return F'{self.data}'


class        a     (   Generic[T]	):







    def __init__(			self       ):
      lowercase							    =       None







    def __iter__(			self       ):
      lowercase							    =       self.top
      while node:
        yield node.data
        lowercase							    =       node.next







    def __str__(			self       ):
      return "->".join([str(_lowerCamelCase       ) for item in self]       )







    def __len__(			self       ):
      return len(tuple(iter(self       )       )       )







    def 			UpperCamelCase_      (			self       ):
      return self.top is None







    def 			UpperCamelCase_      (			self							,		_lowerCamelCase       ):
      lowercase							    =       Node(_lowerCamelCase       )
      if not self.is_empty():
        lowercase							    =       self.top
      lowercase							    =       node







    def 			UpperCamelCase_      (			self       ):
      if self.is_empty():
        raise IndexError('pop from empty stack'       )
      assert isinstance(self.top							,		_lowerCamelCase       )
      lowercase							    =       self.top
      lowercase							    =       self.top.next
      return pop_node.data







    def 			UpperCamelCase_      (			self       ):
      if self.is_empty():
        raise IndexError('peek from empty stack'       )

      assert self.top is not None
      return self.top.data







    def 			UpperCamelCase_      (			self       ):
      lowercase							    =       None


if __name__ == "__main__":
    from doctest import testmod

    testmod()










"""simple docstring"""



_UpperCamelCase		:  List[str]						=		{
    'meter': 'm',
    'kilometer': 'km',
    'megametre': 'Mm',
    'gigametre': 'Gm',
    'terametre': 'Tm',
    'petametre': 'Pm',
    'exametre': 'Em',
    'zettametre': 'Zm',
    'yottametre': 'Ym',
}
# Exponent of the factor(meter)
_UpperCamelCase		:  str						=		{
    'm': 0,
    'km': 3,
    'Mm': 6,
    'Gm': 9,
    'Tm': 1_2,
    'Pm': 1_5,
    'Em': 1_8,
    'Zm': 2_1,
    'Ym': 2_4,
}
def 						_SCREAMING_SNAKE_CASE (    __snake_case			:  float		,					__snake_case			:  str		,					__snake_case			:  str    ):





  '''simple docstring'''





  lowercase							    =       from_type.lower().strip('s'    )
  lowercase							    =       to_type.lower().strip('s'    )

  lowercase							    =       UNIT_SYMBOL.get(__snake_case		,					__snake_case    )
  lowercase							    =       UNIT_SYMBOL.get(__snake_case		,					__snake_case    )

  if from_sanitized not in METRIC_CONVERSION:
    lowercase							    =       (
        f'Invalid \'from_type\' value: {from_type!r}.\n'
        f'Conversion abbreviations are: {", ".join(__snake_case    )}'
    )
    raise ValueError(__snake_case    )
  if to_sanitized not in METRIC_CONVERSION:
    lowercase							    =       (
        f'Invalid \'to_type\' value: {to_type!r}.\n'
        f'Conversion abbreviations are: {", ".join(__snake_case    )}'
    )
    raise ValueError(__snake_case    )
  lowercase							    =       METRIC_CONVERSION[from_sanitized]
  lowercase							    =       METRIC_CONVERSION[to_sanitized]
  lowercase							    =       1

  if from_exponent > to_exponent:
    lowercase							    =       from_exponent - to_exponent
  else:
    lowercase							    =       -(to_exponent - from_exponent)

  return value * pow(10		,					__snake_case    )


if __name__ == "__main__":
    from doctest import testmod

    testmod()


