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python: how to sort a list and print only words with two characters? - Page 2

post #11 of 17
8/18/12 at 4:48pm
This works:
Code:
>>> original = ['this', 'is', 'my', 'list', 'of', 'strings']
>>> filter(lambda x: len(x) == 2, original)
['is', 'my', 'of']

or if you want the full function (I haven't tested this but it should work):
Code:
def siftTwo(original):
    return filter(lambda x: len(x) == 2, original)

Edited by 5outh - 8/18/12 at 5:10pm
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post #12 of 17
8/18/12 at 4:53pm
Quote:
Originally Posted by Chris++ View Post

The beauty of Python is that there is only one right way to do stuff, and that is the most intuitive there is.

Are you joking? This is one of the most false statements I've ever read. You will never find a programming language where there is only one right way to accomplish a task.
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post #13 of 17
8/18/12 at 5:16pm
Quote:
Originally Posted by 5outh View Post

This works:
Code:
>>> original = ['this', 'is', 'my', 'list', 'of', 'strings']
>>> filter(lambda x: len(x) == 2, original)
['is', 'my', 'of']
or if you want the full function (I haven't tested this but it should work):
Code:
def siftTwo(original):
    return filter(lambda x: len(x) == 2, original)

I went about it in a much simple way. However a couple more lines of code.
Code:
original = ['this', 'is', 'my', 'list', 'of', 'strings']
others = []

for index in original:
    if len(index) == 2:
        others.append(index)
print others
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post #14 of 17
8/18/12 at 10:25pm
Quote:
Originally Posted by 5outh View Post

Are you joking? This is one of the most false statements I've ever read. You will never find a programming language where there is only one right way to accomplish a task.

There is one right way in Python, the so called "pythonic" code has been proven to be more efficient, reducing the amount of function calls and in many cases reducing the memory footprint.

You may argue that this is minimal and irrelevant with today's hardware, and while I will agree on a trivial example as this one, on a large scale project it will add up.

As a final argument for my statement... and excerpt from the Zen of Python (a text that describes Python's philosophy) "There should be one-- and preferably only one --obvious way to do it.".
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post #15 of 17
8/19/12 at 9:46pm
Thread Starter 
thanks so much guys. I truly learned a lot more from this lol
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post #16 of 17
8/20/12 at 12:55pm
Quote:
Originally Posted by Chris++ View Post

There is one right way in Python, the so called "pythonic" code has been proven to be more efficient, reducing the amount of function calls and in many cases reducing the memory footprint.
You may argue that this is minimal and irrelevant with today's hardware, and while I will agree on a trivial example as this one, on a large scale project it will add up.
As a final argument for my statement... and excerpt from the Zen of Python (a text that describes Python's philosophy) "There should be one-- and preferably only one --obvious way to do it.".

Bizarre. I mean, I don't understand why functions such as 'filter' even exist in that case. What's the point of having these functions if they're not really supposed to be used? I guess it doesn't make sense to me.

This is basically the exact instance I would see anyone using 'filter', I'm having a hard time figuring out its utility if you're supposed to iterate using a list comprehension. But I guess that's just Python. I've heard the term "pythonic" several times before, but I always assumed that was a way to express how idiomatic code is, not how "correct" it is. Huh.

Edit: As an aside, the most obvious way for me to tackle this problem was to use 'filter', as I'm coming from a strong functional programming background using Haskell, and in Haskell, we use 'filter' a lot!
Edited by 5outh - 8/20/12 at 12:57pm
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post #17 of 17
8/24/12 at 9:49pm
Quote:
Originally Posted by 5outh View Post

Bizarre. I mean, I don't understand why functions such as 'filter' even exist in that case. What's the point of having these functions if they're not really supposed to be used? I guess it doesn't make sense to me.
This is basically the exact instance I would see anyone using 'filter', I'm having a hard time figuring out its utility if you're supposed to iterate using a list comprehension. But I guess that's just Python. I've heard the term "pythonic" several times before, but I always assumed that was a way to express how idiomatic code is, not how "correct" it is. Huh.
Edit: As an aside, the most obvious way for me to tackle this problem was to use 'filter', as I'm coming from a strong functional programming background using Haskell, and in Haskell, we use 'filter' a lot!

My only question about using filter is that if you use it on a list does it destroy the old list and create a modified list?

If so that may be a problem if you still need the old list, but could also be considered a good thing if you want to use less data.
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