Breakpoint result: unexpected EOF while parsing

I wrote this code:

#! /usr/bin/python
# -*- coding: utf-8 -*-

with open("pdb.txt", "r+") as pdb_file, open("pdpbe.txt", "r+") as e_file:
    breakpoint()
    pdb_file=pdb_file.readlines()
    e_file=e_file.readlines()
    breakpoint()
    for line, eline in zip(pdb_file, e_file):
        line=line.strip()
        eline=eline.strip()
        breakpoint()
        if line==eline:
            print(line)
        breakpoint()

I got following error:

SyntaxError: unexpected EOF while parsing" before pdb_file=pdb_file.readlines().

My text files look fine. Could someone help me, please? I am using Python 3.7.9.