How to create a list of functions depending on a parameter?

Arnaud Delobelle arnodel at googlemail.com
Tue May 26 11:20:41 CEST 2009


"Diez B. Roggisch" <deets at nospam.web.de> writes:

> You need to capture n into the closure of the lambda:
>
> f = [lambda x, n=n: x+j for j in xrange(n)]

You mean  [lambda x, j=j: x+j for j in xrange(n)]

Another way would be [(lambda j:lambda x: x+j)(j) for j in xrange(n)]

Or more readably:

def adder(n):
    return lambda x: x+n

[adder(j) for j in xrange(n)]

-- 
Arnaud



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