main.py - from stack import Stack def loadExpressions():...

from stack import Stack
def loadExpressions():
"""loads epressions"""
expressions = []
with open("Data.txt", "r") as txt_file:
for row in txt_file:
expressions.append(row.strip())
return expressions
OPERATORS = ['+', '-', '*', '/', '(', ')', '^']
PRIORITY = {'+':1, '-':1, '*':2, '/':2, '^':3}
def in2post(exp):
"""infix to postfix calc"""
exp = "("+exp+")"
stack = Stack()
output = ''
for ch in exp:
if ch not in OPERATORS:
output+= ch
elif ch=='(':
stack.push(ch)
elif ch==')':
while stack and stack.items[-1]!= '(':
output+=' ' + stack.pop()
new_func(stack)
stack.pop()
else:
while stack and stack.items[-1]!='(' and
PRIORITY[ch]<=PRIORITY[stack.items[-1]]:
output+=' ' + stack.pop()
stack.push(ch)
if stack.items[-1] ==')':