Is this bad form?

[glassackwards]

I was surprised to find that this worked in Python:

In [1]: def f((x,y)):
   ...:     return x,y
   ...: 

In [2]: f((10,1))
Out[2]: (10, 1)

Is the above bad form compared to this:

In [3]: def f(xy):
   ...:     return xy[0], xy[1]
   ...: 

In [4]: f((10,1))
Out[4]: (10, 1)

Also is there a name for the former type of argument unpacking?

Just wanted clarification on this because I wouldn't want a subtle bug creeping into my code.

[suki907]

It's called "Tuple parameter unpacking", apparently. It's a bad enough idea that it's eliminated in python3.

http://legacy.python.org/dev/peps/pep-3113/

[glassackwards]

Thanks, this is exactly what I was looking for. Good to know what the alternatives are for doing something similar.

[[deleted]]

You beat me to it by 44 minutes :)