python.期待した結果を返してくれない。

1
2
3
4
5
1
6

import os

# ファイル名
data_file_name = 'my_test.txt'


new_f=bool(0)

   
my_list_in = []
def fail_new_f():

    if os.path.exists(data_file_name):
    #fileがあれば読み込む
        global new_f
        global my_list_in
        if new_f == bool(0):
            with open(data_file_name, 'r') as f:
                line = f.readline()
                if line != EOFError:
                #    print(line.rstrip("\n"))
                   line = line.rstrip("\n")
                   my_list_in.append(line)     
        
        if new_f==bool(1):
            with open(data_file_name, 'w') as f:
                for item in my_list_in:
                    f.write(item + '\n')
        new_f = bool(1)
    else:
    #fileがなければ作成
        my_list_in = ['1', '2', '3', '4', '5']  
        with open(data_file_name, 'w') as f:
            for item in my_list_in:
                f.write(item + '\n')

if not os.path.exists(data_file_name):
    fail_new_f()

if len(my_list_in) <= 6:
    if new_f == (0):
        fail_new_f()

    my_list_in.append('6')    
    fail_new_f()