Get incomplete data when tring to add fibonacci terms to filename

Question

I have this code about load_fib, write_fib, fib, and return_fib. I'm given a number n, and need to load last calculated fib sequence, and add n additional fibonacci terms to the filename, and return the last fibonacci number written on the file. I was wondering why I get 0 for data instead of 0 1 1 2 when trying global_fib(3, filename) and then with open(filename, "r") as f: ... data = f.read().

fib_called = False
def global_fib(n, filename):
    global gf
    gf = load_fib(filename)
    i = 0
    write_fib(filename)
    while i < n:
        fib()
        write_fib(filename)
        i += 1
    return return_fib()

import os
def fib():
    global fib_called
    if len(gf) == 1:
        gf.append(1)
    else:
        gf.append(int(gf[-1] + gf[-2]))
    fib_called = not fib_called

def write_fib(filename):
    global fib_called
    if fib_called == True:
        filename.open('w')
        filename.write(str(gf[-1]) + ' ')
    fib_called = not fib_called

import os.path
def load_fib(filename):
    if os.path.exists(filename):
        filename.open('r')
        content == filename.read()
        return list(content)
    else:
        f = open(filename,'w')
        f.write('0' + ' ')
        return [0]

def return_fib():
    return gf[-1] 

Answer 1

In your load_fib function, there is a typo when you assign the variable that contains the data of the file -

def load_fib(filename):
    if os.path.exists(filename):
        filename.open('r')
        content == filename.read() # <-- this line
        return list(content)

Should be changed from double equals (which is used to test for equality)

content == filename.read() 

To single equals (assignment)

content = filename.read()