Python: Check the priority of the four operators

Last update on April 17 2025 13:06:01 (UTC/GMT +8 hours)

Operator Priority Checker

Write a Python program to check the priority of the four operators (+, -, *, /).

Sample Solution:

Python Code:

# Import the 'deque' class from the 'collections' module and the 're' module for regular expressions.
from collections import deque
import re

# Define operators, parentheses, and operator priorities.
__operators__ = "+-/*"
__parenthesis__ = "()"
__priority__ = {
    '+': 0,
    '-': 0,
    '*': 1,
    '/': 1,
}

# Define a function 'test_higher_priority' to compare the priorities of two operators.
def test_higher_priority(operator1, operator2):
    # Return True if the priority of 'operator1' is higher than or equal to 'operator2'.
    return __priority__[operator1] >= __priority__[operator2]

# Test the function with different operator pairs and print the results.
print(test_higher_priority('*','-'))
print(test_higher_priority('+','-'))
print(test_higher_priority('+','*'))
print(test_higher_priority('+','/'))
print(test_higher_priority('*','/'))

Sample Output:

True
True
False
False
True

Explanation:

The above Python code defines a function "test_higher_priority()" that compares the priorities of two mathematical operators (+, -, *, /). Priorities are predefined in the "priority" dictionary. The function returns 'True' if the priority of the first operator is higher than or equal to the priority of the second operator.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to evaluate arithmetic expressions respecting operator precedence without using eval().
Write a Python program to calculate the result of expressions with custom-defined operator priorities.
Write a Python program to determine if inserting parentheses into an expression changes its evaluation result.
Write a Python program to analyze an expression and determine the associativity of its operators.

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