Nov 19, 2009
Python Lambda Expressions
I’ve been writing a small Python/Tk application and until recently was having trouble with menu item callback functions. I have a series of menu items, all of which do much the same thing, but within the context of an item-specific ID. Therefore it would make sense to have a generic function that takes some parameter to determine what to do.
However, when adding a menu item and callback, e.g.
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menu.add_command(label = someLabel, command = someCallback)
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you must pass in the name of a function, rather than a function call. To get around this, I used a lambda function to pass in a previously defined value to a callback:
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id = <some_value>
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menu.add_command(label = someLabel, command = lambda id=id: someCallback(id))
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