These lambda functions can be used when you have to write a function, without defining it somewhere in you code. Like in interface building when assigning a function to a button or something. They are some kind of one-line funtions.

Here is an example of normal function f() and after it an example of Lambda function g(). The result is the same.

Very good, THX for sharing this piece of code. That is easy to understand though. But with lambda you can only write small functions.
The only thing i don't know about this is weather lambda in Python is a preprocessor directive ???

Is there even a Python preprocessor?

http://stackoverflow.com/questions/89012...lambda-why
http://docs.python.org/tutorial/controlf...mbda-forms
http://www.secnetix.de/olli/Python/lambd...tions.hawk

What I'd want to see is JavaScript style lambda - full fledged anonymous function whenever I want it, not just a single expression. Ah well, that would mess around with indentation a bit...

(01-06-2011 04:29 PM)Xupicor Wrote:  Is there even a Python preprocessor?

No, there is not.

(01-06-2011 04:29 PM)Xupicor Wrote:  What I'd want to see is JavaScript style lambda - full fledged anonymous function whenever I want it, not just a single expression. Ah well, that would mess around with indentation a bit...

You can define a function anywhere in your code, even inside another function. You just need to give it a name, but it will create a new function whenever the code is run, just as in JS with similar scope rules.

Please note that you the lambda cannot hold a singe statement, it can only hold an expression. It is not possible to assign anything inside a lambda, nor is it possible to use the semicolon. What you can do however, is use lots of nasty tricks or boolean-based short-circuiting to implement if/else structures and the likes. To do assignments, you need to work with lists or dictionaries and use the methods to set the elements to a certain value.

About the preprocessor, yes, I know. Actually I think there were some projects floating around the net that implemented Python preprocessor to some degree, but I fail to see the point in that, since the language is so flexible...