If you have any questions, comments or issues with this project please post them here!
please i tried using the os.path.join() to store my file in the backup directory but its not working I don’t know what the problem could be. Also I would like to know what os.popen() does
Thank you i have solved the problem
1 Like
Hello
I’m having the same problem I had in Project 51. My code is giving error.(I didn’t solve that problem in day 51, so it still exists.)
link to repl: https://replit.com/@SUMAYDOHARE/Day55100Days#main.py
Please help
Hi @SUMAYDOHARE thanks for your post.
I forked your Repl and it seemed to work. I noticed that you had [] in the hhhhh file this time. Did you find that fixed the issue or did you add other code?
Hi
Once again, thanks for your help.
I visited the Forum of Day 51 and found the solution to my problem there
I get an error when my list is empty.
Is there a way to make the .eval() function skip when the file is empty?
Here is my code:
import os, time, random
to_do_list = []
files = os.listdir()
file = "todolist.txt"
def autoload():
if file in files:
f = open(file, "r")
to_do_list = eval(f.read())
f.close()
else:
f = open(file, "w")
f.close()
def autosave():
f = open(file, "w")
f.write(str(to_do_list))
f.close()
def backup():
if "back up/" not in files:
f = os.mkdir("back up")
else:
back_up_name = "backup" + str(random.sample(range(0, 100000),6))
back_up_file = os.path.join("back up/", back_up_name)
f = open(back_up_file, "w")
f.write(str(to_do_list))
f.close()
def find_index(item):
x = to_do_list.index(item)
return int(x)
def menu():
print()
select = input("""select option:\n
'view' To-Do list
'add' to To-Do List
'remove' from To-Do List
'edit' an entry on To-Do List
'clear' to delete all on To-Do List\n
>""").lower()
if select[0] == "v":
printList()
elif select[0] == "a":
item = input("\nwhat do you want to add to your To-Do List?\n").upper()
if item in to_do_list:
print("already on To-Do List!")
else:
to_do_list.append(item)
elif select[0] == "r":
item = input(
"\nwhat do you want to remove from your To-Do List?\n").upper()
confirm = input(f"\nAre you sure you want to remove {item}? (y/n)\n")
if confirm == "y" and item in to_do_list:
to_do_list.remove(item)
elif confirm == "no":
menu()
else:
print()
print(f"{item} was not found on your To-Do List!")
elif select[0] == "e":
item = input("\nwhich entry do you want to change?\n").upper()
new_item = input("\nwhat's the new entry gonna be?\n").upper()
if item in to_do_list:
x = find_index(item)
to_do_list[x] = new_item
print(f"{item} changed to {new_item}")
else:
print()
print(f"{item} was not found on your To-Do List!")
elif select[0] == "c":
to_do_list.clear()
print("To-Do-List hast been cleared!")
else:
print()
print()
print(f"{menu()} is not a valid option! Try again.")
time.sleep(2)
def printList():
print("To-Do List")
print()
for index in range(len(to_do_list)):
print(f"{index+1:2}: {to_do_list[index]}")
print()
time.sleep(2)
while True:
print("TO-DO LIST")
autoload()
menu()
os.system("clear")
backup()
autosave()
One way could be
try:
#eval statement
except:
pass
But as i said in the past, i discourage from using eval. Especially when using things like flask so starting to avoiding it even in simpler projects is a good idea
Thanks! This works…
Well for someone who is taking this course I have no other knowledge than the eval() so far. So I have to go with it.
However, I have another problem now 
Every time I run my program again, it wipes my to-do-list file and overwrites it with the stuff from the current run.
I had this issue before, because I used autosave() subroutine. When I use the code normally (not as sub-routine) it works - I don’t understand why!? I think it’s cleaner to put it in a sub-routine, but why is it not working then!?
import os, time, random
to_do_list = []
files = os.listdir()
file = "todolist.txt"
def autoload():
try:
if file in files:
f = open(file, "r")
to_do_list = eval(f.read())
f.close()
else:
f = open(file, "w")
f.close()
except:
pass
def autosave():
f = open(file, "w")
f.write(str(to_do_list))
f.close()
# check back_up_exists
def backup():
try:
if "back up" not in files:
f = os.mkdir("back up")
else:
back_up_name = "backup_" + str(random.sample(range(0, 100000),1))
back_up_file = os.path.join("back up/", back_up_name)
f = open(back_up_file, "w")
f.write(str(to_do_list))
f.close()
except:
pass
def find_index(item):
x = to_do_list.index(item)
return int(x)
def menu():
print()
select = input("""select option:\n
'view' To-Do list
'add' to To-Do List
'remove' from To-Do List
'edit' an entry on To-Do List
'clear' to delete all on To-Do List\n
>""").lower()
if select[0] == "v":
printList()
elif select[0] == "a":
item = input("\nwhat do you want to add to your To-Do List?\n").upper()
if item in to_do_list:
print("already on To-Do List!")
else:
to_do_list.append(item)
elif select[0] == "r":
item = input(
"\nwhat do you want to remove from your To-Do List?\n").upper()
confirm = input(f"\nAre you sure you want to remove {item}? (y/n)\n")
if confirm == "y" and item in to_do_list:
to_do_list.remove(item)
elif confirm == "no":
menu()
else:
print()
print(f"{item} was not found on your To-Do List!")
elif select[0] == "e":
item = input("\nwhich entry do you want to change?\n").upper()
new_item = input("\nwhat's the new entry gonna be?\n").upper()
if item in to_do_list:
x = find_index(item)
to_do_list[x] = new_item
print(f"{item} changed to {new_item}")
else:
print()
print(f"{item} was not found on your To-Do List!")
elif select[0] == "c":
to_do_list.clear()
print("To-Do-List hast been cleared!")
else:
print()
print()
print(f"{menu()} is not a valid option! Try again.")
time.sleep(2)
def printList():
print("To-Do List")
print()
for index in range(len(to_do_list)):
print(f"{index+1:2}: {to_do_list[index]}")
print()
time.sleep(2)
while True:
print("TO-DO LIST")
autoload()
menu()
os.system("clear")
backup()
autosave()
Well, you are opening the file for writing with option “w”, this means that it will overwrite the file.
You can open the file with option “a” and this will append the new data to the file.
However (and I have not looked at your code), if you always read all data, add data, and write all data … append is wrong.
Also take the good habit of passing the file name to the function instead of using a global variable or constant (btw constants should be all capitals …)
1 Like
ok yes that was a stupid copy paste error… However… still wipes my list each time!!
Again, so far I have just been following the course by David, so let’s forget about the “best-practice” coding for now and focus on why the code doesn’t do what I want it to do 
What is that you need to do? If you want to append just make sure there is nothing that open the files in overwrite mode.
The thing is, when I don’t use the whole auto-save and auto-load code as a subroutine (all the code is directly in the while True loop) it works fine and the file is correctly read every time.
However, if I use this code in several sub-routines, that’s when it overwrites my file every time I run the program. I fail to understand what makes the difference here.
This is the working code now: (compare it to the one above)
import os, time, random
to_do_list = []
files = os.listdir()
file = "todolist.txt"
def find_index(item):
x = to_do_list.index(item)
return int(x)
def menu():
print()
select = input("""select option:\n
'view' To-Do list
'add' to To-Do List
'remove' from To-Do List
'edit' an entry on To-Do List
'clear' to delete all on To-Do List\n
>""").lower()
if select[0] == "v":
printList()
elif select[0] == "a":
item = input("\nwhat do you want to add to your To-Do List?\n").upper()
if item in to_do_list:
print("already on To-Do List!")
else:
to_do_list.append(item)
elif select[0] == "r":
item = input(
"\nwhat do you want to remove from your To-Do List?\n").upper()
confirm = input(f"\nAre you sure you want to remove {item}? (y/n)\n")
if confirm == "y" and item in to_do_list:
to_do_list.remove(item)
elif confirm == "no":
menu()
else:
print()
print(f"{item} was not found on your To-Do List!")
elif select[0] == "e":
item = input("\nwhich entry do you want to change?\n").upper()
new_item = input("\nwhat's the new entry gonna be?\n").upper()
if item in to_do_list:
x = find_index(item)
to_do_list[x] = new_item
print(f"{item} changed to {new_item}")
else:
print()
print(f"{item} was not found on your To-Do List!")
elif select[0] == "c":
to_do_list.clear()
print("To-Do-List hast been cleared!")
else:
print()
print()
print(f"{menu()} is not a valid option! Try again.")
time.sleep(2)
def printList():
print("To-Do List")
print()
for index in range(len(to_do_list)):
print(f"{index+1:2}: {to_do_list[index]}")
print()
time.sleep(2)
while True:
print("TO-DO LIST")
try:
if file in files:
f = open(file, "r")
to_do_list = eval(f.read())
f.close()
else:
f = open(file, "r")
f.close()
except:
pass
menu()
os.system("clear")
try:
if "back up" not in files:
f = os.mkdir("back up")
else:
back_up_name = "backup" + str(random.sample(range(0, 100000),1))
back_up_file = os.path.join("back up/", back_up_name)
f = open(back_up_file, "w")
f.write(str(to_do_list))
f.close()
except:
pass
f = open(file, "w")
f.write(str(to_do_list))
f.close()
First f all you can make things a bit cleaners by using the try except only for the command that might cause the error
f = open(file, "r")
try:
if file in files:
to_do_list = eval(f.read())
except:
pass
f.close()
1 Like
Than I am still lost.
Your code loads the data into a variable, adda data and dumps the entire data into the same file always replacing its previous content. What is the error?
I dont get an error as such. It’s just using code as a subroutine vs. using the code right in the while True loop.
When I use the code as sub-routine (see my code above) it doesn’t seem to load the file properly and clears it every time.
it’s not so much about the main code and how the files are being writen, but the fact that the program works differently depending on whether I use subroutines or not.
ok, i think your issue is a scope issue … as i mentioned before try to pass variables and not assume they are global.
instead of doing something like autoload() and autosave(), do autoload(to_do_list) and autosave(to_do_list) (and probably for back up also). I hope this gives you enough to understand without me being more explicit …
1 Like