






from .balanced_parentheses import balanced_parentheses
from .stack import Stack

def     lowerCAmelCase__  (  UpperCamelCase__       ):



  '''simple docstring'''
  return {"+": 1, "-": 1, "*": 2, "/": 2, "^": 3}.get(UpperCamelCase__  ,     -1       )

def     lowerCAmelCase__  (  UpperCamelCase__       ):



  '''simple docstring'''
  if not balanced_parentheses(UpperCamelCase__       ):
    raise ValueError("""Mismatched parentheses"""       )
  _a						: Stack[str]    =			Stack()
  _a						: Optional[int]    =			[]
  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()
 _snake_case					   =     '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))









"""simple docstring"""




# this script builds a small sample spm file tests/fixtures/test_sentencepiece_no_bos.model, with features needed by pegasus

# 1. pip install sentencepiece
#
# 2. wget https://raw.githubusercontent.com/google/sentencepiece/master/data/botchan.txt

# 3. build
import sentencepiece as spm

# pegasus:
# 1. no bos
# 2. eos_id is 1
# 3. unk_id is 2
# build a sample spm file accordingly
spm.SentencePieceTrainer.train(
    '--input=botchan.txt --model_prefix=test_sentencepiece_no_bos --bos_id=-1 --unk_id=2  --eos_id=1  --vocab_size=1000'
)

# 4. now update the fixture
# mv test_sentencepiece_no_bos.model ../../tests/fixtures/

