2

In python, I have this list containing

['HELLO', 'WORLD']

how do I turn that list into

['OLLEH', 'DLROW']
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4 Answers 4

Reset to default
9 
>>> words = ['HELLO', 'WORLD']
>>> [word[::-1] for word in words]
['OLLEH', 'DLROW']
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1 Comment

@user2278906 You should check the mark next to his answer if you feel it helped you best.
3

Using a list comprehension:

reversed_list = [x[::-1] for x in old_list]
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Comments

1

Arguably using the builtin reversed is more clear than slice notation x[::-1].

[reversed(word) for word in words]

or 

map(reversed, words)

Map is fast without the lambda.

I just wish it was easier to get the string out of the resulting iterator. Is there anything better than ''.join() to put together the string from the iterator?

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2 Comments

This isn't a full answer and no, there is nothing easier than having to use ''.join to put it together
[''.join(reversed(word)) for word in words] is the full version of your first solution, which is valid and some argue it is more readable than [::-1], but I am of the opinion that the reverse slice is much better
0

Using map and lambda(lambdas are slow):

>>> lis=['HELLO', 'WORLD']
>>> map(lambda x:x[::-1],lis)
['OLLEH', 'DLROW']
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2 Comments

why the downvote? Is the answer not useful or incorrect anyhow?
map/lambda combo is unpythonic, and should not be recommended where a list comprehension is the one obvious way

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