10 Python One-liners To Impress Your Friends

[michaelkscott]

http://codeblog.dhananjaynene.com/2011/06/10-python-one-liners-to-impress-your-friends/

[sylvinus]

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

[jchiu1106 → sylvinus]

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

[sk3tch]

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.

[rytis]

Yet the most useful oneliner is missing:

    python -m SimpleHTTPServer

[Tmmrn → rytis]

And

    python3 -m http.server

[sylvinus → Tmmrn]

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

[Cogito]

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.

[evanlong]

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.

[hythloday → evanlong]

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.

[FaddiCat]

Why is number 1 better than just:

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

[eieio → FaddiCat]

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.

[saintfiends → eieio]

or just:

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

[shoo → FaddiCat]

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.

[antonios → FaddiCat]

It isn't.

[__alexs]

No Brainfuck interpreter?

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

[darkf]

These seem ridiculously mundane.

[brass9]

"Error establishing a database connection"

Very funny...

Dumb indian script kiddies... sigh

[kang → brass9]

thats racist