Don't know if this is *why*, but the list comprehension takes an expression at t... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

a3n on July 9, 2014 | parent | context | favorite | on: Anti-Patterns in Python Programming

Don't know if this is why, but the list comprehension takes an expression at the "foo(word)" location, and is therefore more general than map, which requires a function. The comprehension in that case is simpler.

  words = ['w1', 'w2', 'w3']

  [word[1] for word in words]

  ['1', '2', '3']
  
  map(lambda x: x[1], words)

  ['1', '2', '3']

I like looking at the list comprehension better. The use of lambda looks forced in this case. I also imagine there's a penalty for calling the (anonymous) function in map.

icebraining on July 9, 2014 [–]

In that case I'd use

  map(itemgetter(1), words)

a3n on July 10, 2014 | [–]

Instead of my map example, or instead of a list comprehension in general?

icebraining on July 10, 2014 | | [–]

Instead of a list comprehension equivalent to your example.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact