I have a list of dictionaries of clients in a format like this:

dict_list = [{'Name of Business' : 'Amazon', 'Contact Name' : 'Jeff Bezos', 'Email' : '[email protected]'}, {'Name of Business' : 'Microsoft', 'Contact Name' : 'Bill Gates', 'Email' : '[email protected]'}]

and will be using tkinter to build rows for each client with a checkbox next to each. I will later add a button that, when pressed, will send an email to each client based on the information it pulls from the list.

Currently I am doing something like:

ClientCount = len(dict_list)
CurrentCount = 0 while CurrentCount < ClientCount:for i in range(ClientCount):currentClient = Label(text='Client: ' + dict_list[i]['Client']).grid(row=[i], column=1)currentContactName = Label(text='Contact Name: ' + dict_list[i]['Contact Name']).grid(row=[i], column=2)currentEmail = Label(text='Contact Email: ' + dict_list[i]['Email']).grid(row=[i], column=3)CurrentCount += 1

First, I am sure there is an easier way to do this and will take any suggestions towards that but the main issue is adding a checkbox that will, when selected, determine whether or not to send an email to that client.
(A button, added later, will call a command that will check if each client is checked and only send to those that return true etc.)

I am not sure whether I should be creating a new variable to be checked, adding a key and a value to each dictionary to be read at a later point, etc.

First, you should iterate directly over the list rather than using a counter and a while loop:

for client in dict_list:currentClient = Label(text='Client: ' + client['Client']).grid(row=[i], column=1)...

Second, if you do x=Label(...).grid(...), x will always be None. Best practice is to use two different statements. In this case the point is moot since you never use currentClient, but you should get in the habit of always separating them. Group your widget creation together, and your layout together, and your GUI will be much easier to manage:

for client in dict_list:clientLabel = Label(...)contactLabel = Label(...)emailLabel = Label(...)clientLabel.grid(...)contactLabel.grid(...)emailLabel.grid(...)

Third -- and this is the answer to your question -- you can create an instance of IntVar for each checkbutton, and store them either in a separate data structure or right along with your data. For example, to store them by business name you might do it like this:

cbVars = {}
for client in dict_list:...bizname = client["Business Name"]cbVars[bizname] = IntVar()cb = Checkbutton(..., onvalue=1, offvalue = 0, variable = cbVars[bizname])...