Remove duplicate urls of a text file

pyDupRem.py

# Require python 3.8
import sys
import pandas as pd


def remove_dup(path):
    f = open(path, "r")
    arr = pd.Series([line for line in f])
    f.close()
    return arr.drop_duplicates()


def update_file(path, urls):
    f = open(path, "w+")
    for url in urls:
        f.write(url)
    f.close()
    print("file updated...")


if __name__ == '__main__':
    if path:= sys.argv[1]:  # if you don't have python 3.8 remove 'path:=' from this line and put the path var inside if statement
        update_file(path=path, urls=remove_dup(path))