Python Tkinter saving a list

Question

Help, I'm trying to save all the data in my file as a list.

register = []


def some_command():
    register.append([variable,'variable_x'])

def save():
    outFile = open('Save.txt', 'wb')
    pickle.dump(register, outFile)
    outFile.close()

It saves the file succesfully. But when I use "some_command" to add a new element to "register" it doesn't update; It doesn't even give an error. What could be the problem?

just checking it's not an indenting problem, so in the actual source you have the register.append... line tabbed in? — max k.
– max k., Commented Mar 9, 2013 at 6:22
Can you give a more complete example showing what variable is when you are using some_command? — Radio-
– Radio-, Commented Mar 9, 2013 at 6:24
There are several not just one. For example: [Yellow,'Color'] [True, 'Is Monty Python funny?'] [42, 'Meaning of Life'] — madprogramer
– madprogramer, Commented Mar 9, 2013 at 6:27

max k. · Accepted Answer · 2013-03-09 06:28:42Z

1

It will work if you pass register and variable into some_command, but otherwise you cant edit register properly from inside the function. So, it would look something like this:

def some_command( register, variable ):
    register.append([variable,'variable_x'])

It's not strictly necessary to pass variable in, but it does help keep things neat.

And obviously you would call it with

some_command( register, whatever you want )

answered Mar 9, 2013 at 6:28

max k.

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6 Comments

madprogramer Over a year ago

Can't I: def some_command(): global register ... instead?

max k. Over a year ago

Have you tried it? I know the method that I put up is recommended to keep things neat when the projects get large (and people just generally hate global), but if that worked it would definitely be a better fix, and a lot smaller too

madprogramer Over a year ago

Tried, but it doesn't work. The problem with your code is that this saving function is supposed to be automatic. So just passing in some_command() should be enough.

max k. Over a year ago

Not sure what you mean by supposed to be automatic, so just some_command() should be enough? As in it is a callback or something like that? If that's the problem, you can always use a lambda to call it

Sami N Over a year ago

stackoverflow.com/questions/423379/… You can implement the register-variable as global, but as said above, global variables are mostly frowned upon (for a good reason).

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