If a callback does not take any argument, it can be handled with a simple function, such as the one shown in the preceding code. However, if a callback needs to take arguments, we can use the lambda function, as shown in the following code snippet:
def my_callback (argument) #do something with argument
Then, somewhere else in the code, we define a button with a command callback that takes some arguments, as follows:
tk.Button(root,text="Click", command=lambda: my_callback ('some argument'))
Python borrows a specific syntax from functional programming, called the lambda function. The lambda function lets you define a single-line, nameless function on the fly.
The format for using lambda is as follows:
lambda ...
