"Payal" <[email protected]> wrote
>>> class A(tuple): ... def __new__(cls, a, b): ... return tuple.__new__(cls, (a, b))
a. I have seen this cls before, what does it mean?
It is an abbreviation for class. The first parameter to new() must be a refernce to the class. It is similar to self in an instance method, where the first parameter is a reference
to the instance.
b. What does type(_) mean?
The _ refers to the last evaluated result, in this case the tuple (1,2). Its a shorthand trick, I think it only works in the interpreter, I don't like
it and never use it, but many do. (FWIW Perl has a similar shortcut and Perl fans use it a lot!) Try:
5+5
10
A = 1+2 print _
10
A
3
print _
3 HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ _______________________________________________ Tutor maillist - [email protected] To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
