10 Python One-liners To Impress Your Friends | Hacker News Reader

10 Python One-liners To Impress Your Friends

codeblog.dhananjaynene.com

14 pointsmichaelkscott18 comments

I find it weird that the author writes about one-liners in python without knowing about list comprehensions

Agreed. Also in his comment he said list comprehension can replace reduce...

10 Python one-liners to piss off your colleagues by ignoring the Zen.

Seriously though, some of these are ridiculously unreadable so think twice before using any for anything more than theory.

Yet the most useful oneliner is missing:

    python -m SimpleHTTPServer

And

    python3 -m http.server

That could actually be the best incentive yet to make me install python3 right now :)

Number 5 should read (not that it matters): print map(lambda x: "Happy Birthday " + ("to you" if x != 2 else "dear Name"),range(4))

In general, I was expecting more. I was hoping for some slightly more obscure examples, though I guess the point is that many common problems are 1 liners in Python.

Why is number 1 better than just:

    [x*2 for x in range(1, 11)]

It isn't.

I felt the same about number 3.

  [x in tweet.split() for x in wordlist]

Seems better to me than

  map(lambda x: x in tweet.split(),wordlist)

Although the natural thing for me to do would be

  [x for x in wordlist if x in tweet]

Which both generates a list of words instead of booleans(['scala', 'sbt'] instead of [True, False, False, False, False]) and also matches the 'sbt' in tweet.

or just:

    set(tweet.split()) & set(wordlist)

Or with numpy:

    2 * numpy.arange(1, 11)

The usual notation for working with elements of vector spaces is nice when working with arrays of numbers.

sigh ... when will people learn ... one-liners are not good. Especially when they lead to bugs. For example #4 in the list. If you that didn't jump out to you as a bug. You are a fucking idiot and shouldn't be writing production code.

For reference, a correct #4 would read:

  with open("one_liners.py") as f: print f.readlines()

In CPython, a file handle is closed immediately the file goes out of scope, because it's reference-counted. In Jython (and I believe IronPython too), with lazier garbage collection, the filehandle would stay open until it was gc'd. I have no idea about PyPy's behaviour.

No Brainfuck interpreter?

http://www.cs.princeton.edu/~ynaamad/misc/bf.htm

"Error establishing a database connection"

Very funny...

Dumb indian script kiddies... sigh

thats racist

These seem ridiculously mundane.

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