code: 
  from .balanced_parentheses import balanced_parentheses
  from .stack import Stack
  
  
  
  
  
  
  
  def 							UpperCAmelCase				(     UpperCAmelCase      )->		int:
  
  
  
  
  
  
  
  					'''simple docstring'''
  
  
  
  					return {"+": 1, "-": 1, "*": 2, "/": 2, "^": 3}.get(_UpperCamelCase				,-1      )
  
  
  
  
  
  
  
  def 							UpperCAmelCase				(     UpperCAmelCase      )->		str:
  
  
  
  
  
  
  
  					'''simple docstring'''
  
  
  
  					if not balanced_parentheses(_UpperCamelCase      ):
  										raise ValueError('''Mismatched parentheses'''      )
  					SCREAMING_SNAKE_CASE_	      =       Stack()
  					SCREAMING_SNAKE_CASE_	      =       []
  					for char in expression_str:
  										if char.isalpha() or char.isdigit():
  															postfix.append(_UpperCamelCase      )
  										elif char == "(":
  															stack.push(_UpperCamelCase      )
  										elif char == ")":
  															while not stack.is_empty() and stack.peek() != "(":
  																				postfix.append(stack.pop()      )
  															stack.pop()
  										else:
  															while not stack.is_empty() and precedence(_UpperCamelCase      ) <= precedence(stack.peek()      ):
  																				postfix.append(stack.pop()      )
  															stack.push(_UpperCamelCase      )
  					while not stack.is_empty():
  										postfix.append(stack.pop()      )
  					return " ".join(_UpperCamelCase      )
  
  
  if __name__ == "__main__":
  		from doctest import testmod
  
  		testmod()
  		A_														=      "a+b*(c^d-e)^(f+g*h)-i"
  
  		print("Infix to Postfix Notation demonstration:\n")
  		print("Infix notation: " + expression)
  		print("Postfix notation: " + infix_to_postfix(expression))
  
  
  
style_context: 
  
  
  from typing import TYPE_CHECKING
  
  from ...utils import (
      OptionalDependencyNotAvailable,
      _LazyModule,
      is_flax_available,
      is_sentencepiece_available,
      is_tf_available,
      is_tokenizers_available,
      is_torch_available,
  )
  
  
  A_														=      {
      "configuration_switch_transformers": [
          "SWITCH_TRANSFORMERS_PRETRAINED_CONFIG_ARCHIVE_MAP",
          "SwitchTransformersConfig",
          "SwitchTransformersOnnxConfig",
      ]
  }
  
  try:
  		if not is_torch_available():
  				raise OptionalDependencyNotAvailable()
  except OptionalDependencyNotAvailable:
  		pass
  else:
  		A_														=      [
  		    "SWITCH_TRANSFORMERS_PRETRAINED_MODEL_ARCHIVE_LIST",
  		    "SwitchTransformersEncoderModel",
  		    "SwitchTransformersForConditionalGeneration",
  		    "SwitchTransformersModel",
  		    "SwitchTransformersPreTrainedModel",
  		    "SwitchTransformersTop1Router",
  		    "SwitchTransformersSparseMLP",
  		]
  
  
  if TYPE_CHECKING:
  		from .configuration_switch_transformers import (
  		    SWITCH_TRANSFORMERS_PRETRAINED_CONFIG_ARCHIVE_MAP,
  		    SwitchTransformersConfig,
  		    SwitchTransformersOnnxConfig,
  		)
  
  		try:
  				if not is_torch_available():
  						raise OptionalDependencyNotAvailable()
  		except OptionalDependencyNotAvailable:
  				pass
  		else:
  				from .modeling_switch_transformers import (
  				    SWITCH_TRANSFORMERS_PRETRAINED_MODEL_ARCHIVE_LIST,
  				    SwitchTransformersEncoderModel,
  				    SwitchTransformersForConditionalGeneration,
  				    SwitchTransformersModel,
  				    SwitchTransformersPreTrainedModel,
  				    SwitchTransformersSparseMLP,
  				    SwitchTransformersTopaRouter,
  				)
  
  
  else:
  		import sys
  
  		A_														=      _LazyModule(__name__, globals()["__file__"], _import_structure, module_spec=__spec__)
  
  
  