Please complete this assignment and submit in a python file, name it p5.py and implement expression...

Question

Please complete this assignment and submit in a python file, name it p5.py and implement expression evaluator using Python. The input text files t5*.dat should be at the same directory with your p5.py file. Each input file has only one expression consists of positive integers, whitespaces like space (‘ ‘) or tab, add (‘+’), multiply (‘*’), open parenthesis (‘(‘), and close parenthesis (‘)’). If input contains any other characters or imbalanced open and close parenthesis, your p5 should report e
or and handle the next input file if there is one. The parenthesis has the highest precedence, the * is second highest, and + is the lowest. Since you read input as a character string, you need to convert numbers to integer by int(). If the input is a legal expression, your p5 should output co
ect answer for the expression.

Example input and output:
t50.dat:
2*(5+3*3)
The output for t50.dat should be 28
t51.dat:
(1 + 2 * (51 + 3 * 3)) * XXXXXXXXXX
The output for t51 should be 1562
t59.dat:
(1+a)) + 1 * ((2)
Your p5 should report e
or and handle next input file.

p5-svdsybp3.docx

Sanghamitra · Accepted Answer

66339/p5.py
import os
import math
#change the path
directory = r'C:\Users\HP\Downloads\66339'
ALLOWED_NAMES = {
    k: v for k, v in math.__dict__.items() if not k.startswith("__")
}
# Function to convert list to string  
def listToString(s):
    # initialize an empty string 
    str1 = ""
    # traverse in the string   
    for ele in s:  
        str1 += ele
    # return string   
    return str1
def evaluate(expression):
    """Evaluate a math expression."""

    code = compile(expression, "", "eval")
    # Validate allowed names
    for name in code.co_names:
        if name not in ALLOWED_NAMES:

Please complete this assignment and submit in a python file, name it p5.py and implement expression evaluator using Python. The input text files t5*.dat should be at the same directory with your p5.py...

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