Ps3 problem 2: http://codepad.org/OSOOGkZp

Sorry for all the questions, but is there a better way to return the locations of the keys in a tuple than converting a list into a tuple? Can I somehow start with a tuple and add to it as keys are found?

Thanks,
sean

Question

Ps3 problem 2: http://codepad.org/OSOOGkZp

Sorry for all the questions, but is there a better way to return the locations of the keys in a tuple than converting a list into a tuple? Can I somehow start with a tuple and add to it as keys are found?

Thanks,
sean

anonymous · Answer

You can use
matchesLoc += (index, )
if matchesLoc is a tuple.  Notice the strange extra comma after index.

anonymous · Answer

Awesome! That is exactly what I wanted to do. I didn't include the strange comma when I tried that. Thanks!

anonymous · Answer

Why would you have?  It's completely non-intuitive and ridiculous.

anonymous · Answer

Ah, I think I just figured it out.  You can't just say
(2)
is a tuple, because that's already a mathematical expression that evaluates to 2.  Just like if I said
x = 4*(2+2)
It doesn't think that (2+2) is a tuple with a single value of 4.  I guess parentheses are a bit overloaded in python.

And, I guess, thinking about it, it's really the simplest and most elegant way to differentiate between a 1-valued tuple and a number in parens.  You can also put a dangling comma at the end of a list, so at least they're consistent.

anonymous · Answer

the Python docs are an excellent resource especially the tutorial - they should have been installed on your computer. F1 in IDLE or they are also online http://docs.python.org/tutorial/datastructures.html#tuples-and-sequences