[Tutor] list generation

[Alan Gauld]

On 11/05/2021 01:12, Ed Connell wrote:
> Thanks for your help. (All)
>
> I was working with  'map' and the function that it was mapping needed
> 2 arguments.  The first was a list of values.  The second was always
> the same - like 2.  Thus I needed a list of 2s or whatever at least as
> long as the first list.  (Like [ 2, 2, ...2 ])  Of course I could use
> a simple loop.  Then I hit on [ 2 for _ in range( length ) .  But I
> like yours best - [ 2 ] * length.  Thanks again.

The usual way I'd solve that is to use a lambda expression:

result = map(lambda x: foo(x,2), collection)

Which will call the lamba with x from collection.

Then the lambda calls foo() with x as the first and 2 as the second
argument.


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Alan G
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