I'm trying to make a simple log in menu. The database is stored locally via .txt file, but there is an error in finding a path to it

I’m very new to python, so as one of the first projects I decided to a simple log-in menu, however, it gives me a mistake shown at the bottom.

The link to the tutorial I used:

https://www.youtube.com/watch?v=dR_cDapPWyY&ab_channel=techWithId

This is the code to the log-in menu:

def welcome():
    print("Welcome to your dashboard")

def gainAccess(Username=None, Password=None):
    Username = input("Enter your username:")
    Password = input("Enter your Password:")
    
    if not len(Username or Password) < 1:
        if True:
            db = open("database.txt", "C:UsersDeePakOneDriveDesktopdatabase.txt.txt")
            d = []
            f = []
            for i in db:
                a,b = i.split(",")
                b = b.strip()
                c = a,b
                d.append(a)
                f.append(b)
                data = dict(zip(d, f))
            try:
                if Username in data:
                    hashed = data[Username].strip('b')
                    hashed = hashed.replace("'", "")
                    hashed = hashed.encode('utf-8')
                    
                    try:
                        if bcrypt.checkpw(Password.encode(), hashed):
                        
                            print("Login success!")
                            print("Hi", Username)
                            welcome()
                        else:
                            print("Wrong password")
                        
                    except:
                        print("Incorrect passwords or username")
                else:
                    print("Username doesn't exist")
            except:
                print("Password or username doesn't exist")
        else:
            print("Error logging into the system")
            
    else:
        print("Please attempt login again")
        gainAccess()
        
        # b = b.strip()
# accessDb()

def register(Username=None, Password1=None, Password2=None):
    Username = input("Enter a username:")
    Password1 = input("Create password:")
    Password2 = input("Confirm Password:")
    db = open("database.txt", "C:UsersDeePakOneDriveDesktopNamedatabase.txt")
    d = []
    for i in db:
        a,b = i.split(",")
        b = b.strip()
        c = a,b
        d.append(a)
    if not len(Password1)<=8:
        db = open("database.txt", "C:UsersDeePakOneDriveDesktopNamedatabase.txt")
        if not Username ==None:
            if len(Username) <1:
                print("Please provide a username")
                register()
            elif Username in d:
                print("Username exists")
                register()      
            else:
                if Password1 == Password2:
                    Password1 = Password1.encode('utf-8')
                    Password1 = bcrypt.hashpw(Password1, bcrypt.gensalt())
                                       
                    db = open("database.txt", "C:UsersDeePakOneDriveDesktopNamedatabase.txt")
                    db.write(Username+", "+str(Password1)+"n")
                    print("User created successfully!")
                    print("Please login to proceed:")

                    
                    # print(texts)
                else:
                    print("Passwords do not match")
                    register()
    else:
        print("Password too short")



def home(option=None):
    print("Welcome, please select an option")
    option = input("Login | Signup:")
    if option == "Login":
        gainAccess()
    elif option == "Signup":
        register()
    else:
        print("Please enter a valid parameter, this is case-sensitive")




# register(Username, Password1, Password2)
# gainAccess(Username, Password1)
home()

When I run it, I get this issue:

    db = open("database.txt", "C:UsersDeePakOneDriveDesktopNamedatabase.txt")
                                                                                                        ^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated UXXXXXXXX escape