Q:

Python - How can I avoid b"\n" being written in a text file with "wb" causing a line break?

Here is my case:
# Small hashing script example
import hashlib
import os

def original_pass(Password):
    salt = os.urandom(64)
    hashed = hashlib.pbkdf2_hmac("sha512", Password.encode(), salt, 300000, dklen = 124)
    with open("Hash.txt", "wb") as file:
        file.write(salt + b"\n" + hashed)
        file.close()

def check_pass(New_Pass):
    with open("Hash.txt", "rb") as file:
            f = file.readlines()
            print (f)
            check_hash = hashlib.pbkdf2_hmac("sha512", New_Pass.encode(), f[0].strip(b"\n"), 300000, dklen = 124)   
            file.close()     
    if check_hash == f[1]:
        return True
    else:
        return False

original_pass("Password")
print (check_pass("Password"))

My problem is that occasionally the hash will contain characters such as \n. E.G. b"x004\n4\no5". This line gets split into b"x004\n", b"4\no5". This causes errors when I try to read things like the salt, since it may be split up into multiple pieces. Is there any way of avoiding it being read like that, or just stopping it from writing it that way? 
To address the duplicate remark
I am dealing specifically with byte strings here and not regular strings. Both are a distinct data type, moreso in python 3 (the version I'm using) as seen here: What is the difference between a string and a byte string?. This distinction means that certain string methods such as .encode() don't work on byte strings. Thus there is a clear difference in the data types I'm dealing with and how they are manipulated, etc...

A:

Based on @Blckknght comment, code using knowledge of fixed length salt:
import hashlib
import os

SALT_LEN = 64

def hash(password,salt):
    return hashlib.pbkdf2_hmac('sha512',password.encode(),salt,300000,dklen=124)

def original_pass(password):
    salt = os.urandom(SALT_LEN)
    hashed = hash(password,salt)    
    with open('hash.bin','wb') as file:
        file.write(salt + hashed)

def check_pass(password):
    with open('hash.bin','rb') as file:
        data = file.read()
    salt,hashed = data[:SALT_LEN],data[SALT_LEN:]
    check_hash = hash(password,salt)    
    return check_hash == hashed

original_pass('Password')
print(check_pass('Password'))

