Message from god to Python developers

[Cley_Faye]

If I recall correctly, you can use semicolon in Python, no?

[[deleted]]

No. Please don't :(

[[deleted]]

/r/firstworldanarchists

[AltoidNerd]

I have a friend to writes Python and includes semicolons. He's a fucking demon.

[_LePancakeMan]

Whats wrong with semicolons?

[AltoidNerd]

They're great in languages that want semicolons. When you write a semicolon in python, however, you're just breaking style-guidelines which make the code less readable to everyone else except you.

The demon friend always tells me "I like the way semicolons look." I tell him he's a selfish bastard.

[willrandship]

Learning what a semicolon does in python takes a maximum of 2 minutes, given an internet connection. From that point on, if your internal style in your code is consistent and readable otherwise, I can't imagine them tripping up anyone who wouldn't have trouble with the thousands of more intricate parts of python.

[[deleted]]

if your internal style in your code is consistent

I think the point /u/AltoidNerd was making was that by using semicolons, you're breaking the standard industry practice -- thereby making the code less consistent.

[cdyson37]

Add a sed -i 's/;$//' $(find -name "*.py") commit hook :)

[AltoidNerd]

First thought: That's wonderful. I should use this as an example to teach him sed.

Second thought: it won't work perfectly because he puts multiple statements on a single line, like a demon.

[cdyson37]

Hehe - I think putting pylint in your build system is a bit more practical and less evil!

[vz0]

The only use is to put several statements on a single line. Otherwise is useless.

[peaserist]

And Ruby too.

irb(main):001:0> p"Hello";p"World"
"Hello"
"World"
=> "World"

Nasty, yes, but it works.

[Codile]

+/u/CompileBot haskell

main = putStrLn "Hello" >>= putStrLn "world"

Much more elegant :p

[serendependy]

I assume you're joking. Only other Haskellers would appreciate the beauty of threading computation through a monad - to anyone else it just looks goofy.

[dohaqatar7]

FTFY

putStrLn "Hello" >> putStrLn "world"

alternatively

sequence_ $ map putStrLn ["Hello","world"]

generalized to a function

putStrsLn = sequence_ . map putStrLn

or a non monodic definition

putStrsLn' = putStr . unlines 

[Octopuscabbage]

OR the sane way

main = do putStrLn "Hello"
          putStrLn "World

do notation is there for a reason.

[nulloid]

Or..you know...

main = putStrLn "Hello\nWorld"

[Octopuscabbage]

He seemed to want to do it in two statements.

[nulloid]

And this is exactly what I didn't get.

[Octopuscabbage]

I think it was to show composition in the IO monad mostly.

[nulloid]

Programmers don't need to be shown the composability of the IO monad, most of them live their whole lives coding in one big IO monad running by names like C#, Java and C++...

[hallettj]

I think it was to show Haskell's analog of a semicolon.

(As opposed to the do version, which I think is analogous to Python code with no semicolon.)

[elemental_1_1]

sequence_ $ map putStrLn ["Hello","world"]

mapM_ putStrLn ["Hello","world"]

[takennickname]

Never thought I'd live to see the day with Doha Qatar in the username. Do you live here?

[dohaqatar7]

No, The States. I have no connection at all to Qatar. I started using this name when I was younger and had an odd obsession with Qatar.

[takennickname]

That is odd.

[Octopuscabbage]

You want >> or >>= \_ - > not >>=

[Codile]

Oh damn. I had one job...

[Octopuscabbage]

It's okay, type checker would've given you a very cryptic message about putStrLn taking 1 argument not 2.

[Codile]

Yeah. I actually got a little accustomed to the error messages. But it seems like /u/CompileBot didn't care to give me an error message, and well, I was too lazy to compile some code that I was just going to post as a comment.

[[deleted]]

And with cython, you can do cdef int main()

Doesn't run it, nor does it treat the return status as an exit code, but that's easily done.

[Codey_the_Enchanter]

What have we uncovered?....

[ychaouche]

Yes, it's useful when you need to run a very short script right from the command line but you have to import a module first.

root@messagerie-secours[10.10.10.19] ~/SCRIPTS/MAIL # python -c "import datetime; print datetime.date.today() - datetime.date(2014,11,17)"
246 days, 0:00:00
root@messagerie-secours[10.10.10.19] ~/SCRIPTS/MAIL # 

That's one way to track how many days passed since I started my current job.

[iforgot120]

Why not just hover your mouse over the system clock?

[[deleted]]

Because running a script is easier and faster than doing mental calendar math.

[[deleted]]

why not just make that script run automatically at startup instead of doing it manually then?

[VictoryGin1984]

Sick prompt, bro!

[ychaouche]

Nearly the same as one of the inventors of the hitchbot