Is there a Python equivalent of the Haskell 'let'

Question

Is there a Python equivalent of the Haskell \'let\' expression that would allow me to write something like:

list2 = [let (name,size)=lookup(productId) in (ba         


        

Answer 1

Only guessing at what Haskell does, here's the alternative. It uses what's known in Python as "list comprehension".

[barcode(productId), metric(size)
    for (productId, (name, size)) in [
        (productId, lookup(productId)) for productId in list_]
]

You could include the use of lambda:, as others have suggested.