Why are Python lambdas useful? [closed]

Answer 1

lambdas are extremely useful in GUI programming. For example, lets say you're creating a group of buttons and you want to use a single paramaterized callback rather than a unique callback per button. Lambda lets you accomplish that with ease:

for value in ["one","two","three"]:
    b = tk.Button(label=value, command=lambda arg=value: my_callback(arg))
    b.pack()

(Note: although this question is specifically asking about lambda, you can also use functools.partial to get the same type of result)

The alternative is to create a separate callback for each button which can lead to duplicated code.