The first form uses a string argument, and the backslashes are there to escape
the double quotes inside other double quotes. You could replace either the
inner or outer quote pairs with single quotes in that example and get rid of
the backslashes.
The second example (using "lambda: ") creates an anonymous function that takes
no arguments and which just calls `nuke.createNode("Blur")` when called, and
then binds the resulting function to the menu command.
If you use the string form, the string will be exec'ed when the menu command is
invoked. If you use a callable, it will be called (with no arguments).
You can't use `m.addCommand("Filters/Blur", nuke.createNode("Blur"))`, because
`nuke.createNode("Blur")` will be called when the addCommand method is called
(while the menus are being built). In other words, you will be trying to pass a
created node to `m.addCommand()`.
-Nathan
From: Matthew Doll
Sent: Monday, November 17, 2014 1:15 PM
To: Nuke Python discussion
Subject: [Nuke-python] "lambda" or \"xyz\"
In the docs about adding menu items it mentions both:
m.addCommand("Filters/Blur", "nuke.createNode(\"Blur\")" )
or its alternative:
m.addCommand("Filters/Blur", lambda: nuke.createNode("Blur") )
I'm not clear what is the functionality here, why not:
m.addCommand("Filters/Blur", nuke.createNode("Blur"))
I can't find any references on this list or in the docs to what exactly those
backslashes or "lambda:" actually do.
Thanks,
Matt
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