Phone Number Validator problem

Question

What is wrong with my code?

import re
#your code goes here
phone_number = int(input())
if(len(phone_number) = 8 and (phone_number[0] = 1 or phone_number[0] = 8 or phone_number[0] = 9):
print("Valid")
else: print("Invalid")

Answer 1

Hi! this is a task for the knowledge of regular expressions. please use them in your solution.

Answer 2

In if you must use the comparison operator, rather than equalizing

if a == 1: