function - Why use command=lambda : somefunction() vs command=somefunction in button commands? - Stack Overflow

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I've seen this a lot online but with no discernable rhyme or reason. When creating an event binding, why call "lambda: thefunction() " instead of just passing " thefunction"? -- especially when nothing needs passed to said function?

ie. self.button = tk.Button(root, command= lambda:arb_func_call() vs. self.button = tk.Button(root, command= arb_func_call

is this a matter of style or is there a reason to use x over y?

I've seen this a lot online but with no discernable rhyme or reason. When creating an event binding, why call "lambda: thefunction() " instead of just passing " thefunction"? -- especially when nothing needs passed to said function?

ie. self.button = tk.Button(root, command= lambda:arb_func_call() vs. self.button = tk.Button(root, command= arb_func_call

is this a matter of style or is there a reason to use x over y?

• function
• tkinter
• button
• lambda
• binding

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• 1 When nothing is being passed in as an argument to arb_func_call, both approaches are equivalent. I prefer the command=arb_func_call because it's shorter and more readable to me but I use lambda if I am passing arguments to the callback function. – TheLizzard Commented yesterday

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There is no reason to use lambda for the command attribute of a button, unless you need the command to pass one or more arguments. The lambda with no arguments only serves to make the code more complicated than it needs to be.

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