Python namedtuple slice

Question

this is my first question here...

if I have a namedtuple like the below

 FDResult = namedtuple('FDResult', ['S', 'Payoff', 'V'])

and I have an array that has a collection of namedtuple like the below

 bla = [FDResult(S=100.0, Payoff=0.0, V=0.4693541525097441),
 FDResult(S=102.0, Payoff=1.0, V=0.4944046100897207),
 FDResult(S=104.0, Payoff=1.0, V=0.5188897967596792),
 FDResult(S=106.0, Payoff=1.0, V=0.5427339609362274),
 FDResult(S=108.0, Payoff=1.0, V=0.5658731041633024)]

How do I get an array slice of S?

 bla[:].S #I want to get [100.0,102.0,104.0,...] as a result

that doesn't work with error: AttributeError: 'list' object has no attribute 'S'...

Any suggestion appreciated. Thanks.

Answer 1

I think you want a list comprehension, for example

[x.S for x in bla[:]]

You can of course substitute a more general slice of your list in there, e.g. bla[1:-1:2].