Flatten a list/tuple and Call a function with tuples
jstroud at mbi.ucla.edu
Wed Jul 25 18:49:22 CEST 2007
> On Jul 25, 10:19 am, Stargaming <stargam... at gmail.com> wrote:
>> On Wed, 25 Jul 2007 14:50:18 +0000, beginner wrote:
>>> I am wondering how do I 'flatten' a list or a tuple? For example, I'd
>>> like to transform[1, 2, (3,4)] or [1,2,[3,4]] to [1,2,3,4].
>> A recursive function, always yielding the first element of the list,
>> could do the job. See the ASPN Python Cookbook for a few implementations.http://aspn.activestate.com/ASPN/search?
>>> Another question is how do I pass a tuple or list of all the aurgements
>>> of a function to the function. For example, I have all the arguments of
>>> a function in a tuple a=(1,2,3). Then I want to pass each item in the
>>> tuple to a function f so that I make a function call f(1,2,3). In perl
>>> it is a given, but in python, I haven't figured out a way to do it.
>>> (Maybe apply? but it is deprecated?)
>>>>> def foo(a, b, c): print a, b, c
>>>>> t = (1, 2, 3)
>> 1 2 3
>> Have a look at the official tutorial, 4.7.4http://www.python.org/doc/
> Hi Stargaming,
> I know the * operator. However, a 'partial unpack' does not seem to
> def g():
> return (1,2)
> def f(a,b,c):
> return a+b+c
> f(*g(),10) will return an error.
> Do you know how to get that to work?
Were this not hypothetical, I would make use of the commutative property
1+2+10 = 10+1+2
Also, this has not been suggested:
py> def g():
... return (1,2)
py> def f(a,b,c):
... return a+b+c
py> f(c=10, *g())
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