Pyth Training - 2017-07-20

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Mr. Xcoder

09:35

I'll leave a CMC, solve it when you have time and want. I wonder if I can golf my solution

CMC: Given a list, extract the first and the last prime (guaranteed the list contains at least two primes)

(the list only contains positive integers)

Jim

Just passing

Mr. Xcoder

Me too

I wonder if a solution of mine to a self-challenge can be golfed :)

Jim

@Mr.Xcoder I'll try that

Mr. Xcoder

Thanks

It feels a bit too long, I have 11 10 bytes

Jim

I think you can reapply your solution of yesterday .MP_ (or something like that)

about extracting primes from a list

Mr. Xcoder

09:44

@Jim Yes, I did

That doesn't really save bytes

That actually wastes 1, I think

Oh, I came up with something shorter

Jim

Nice

I will look into it later

Mr. Xcoder

For reference, I now have 9 bytes

Jim

10:08

By the way the solution .MP_ doesn't work for lists that do not contain primes

Mr. Xcoder

@Jim That is true

I haven't used it for this CMC

Have you solved it?

Jim

@Mr.Xcoder No

Mr. Xcoder

Ah, ok

Ping me when you do

Bye!

5 hours later…

Jim

15:28

@Mr.Xcoder Still 9 bytes?

1 hour later…

Mr. Xcoder

16:35

Yes

@Jim outgolfed me?

Jim

@Mr.Xcoder Absolutely, 8 bytes

Mr. Xcoder

I didn't even work on it since then

@Jim wait, trying to tie you

Jim

Okay

Mr. Xcoder

I may respond late, I'm on mobile

I have eKfP_TQhK, Trying to golf

Don't spoiler me

Jim

Take your time

Mr. Xcoder

16:43

Thanks

My solution is not even valid

It should be eKSfP_TQhK

(10 bytes)

Are you sure yours is 8?

If so, great job 👍🏽

@Jim Can you give me your solution now?

Jim

Yes

Just a minute

@Mr.Xcoder hC_B.MP_

Mr. Xcoder

16:58

Niceee

Jim

It could be hM_B.MP_ also

Mr. Xcoder

I didn't know of B

Jim

It is very handful here

Mr. Xcoder

I see

Jim

Basically returns [A, -A] in this case

Mr. Xcoder

17:01

I see, very nice

Maybe give me an easy CMC to solve on mobile?

(I am bored...)

Jim

Hmmmm…

Mr. Xcoder

@Jim take your time

Jim

CMC: Given a list of characters, output each character multiplied by its position. ['c', 'z', 'w', 'u'] -> ['', 'z', 'ww', 'uuu']

Mr. Xcoder

Like my CMC on TNB earlier

Solving it now

Thanks

Jim

5 bytes

3 bytes now

Mr. Xcoder

17:08

The 5 byte one: m*dxQ

@Jim found a useful built-in?

Jim

@Mr.Xcoder That's nice, I would have not thought of x here

My 5 bytes version was: .e*kb

Mr. Xcoder

@Jim i wouldn't of thoght of k and b here :P

Jim

@Mr.Xcoder :D

There is a zip which takes a function

zip(list1, list2, func)

Mr. Xcoder

@Jim .V?

Jim

Do you know it?

Mr. Xcoder

17:12

Yeah, never used, but I know of it

Will do

Jim

No, it's not .V

Mr. Xcoder

I'll find it anyway

Jim

I can tell you, it's not an easy one to find by its description

Mr. Xcoder

@Jim I'll ask you if I won't find it

Jim

Okay

Mr. Xcoder

17:15

Does it take <lst> <lst> and something else?

Jim

Yes

Mr. Xcoder

Or <col> <col> or <seq> <seq> or something else?

Jim

It's actually <col>

Mr. Xcoder

Thanks

Jim

The order is different thought

Mr. Xcoder

17:17

What is the built-in?

Jim

You give up?

Mr. Xcoder

I'll try to solve the rest

I cannot find the char

Jim

It's V

Mr. Xcoder

@Jim I found it, but ignored because .V :/

Jim

@Mr.Xcoder I suspected that

Mr. Xcoder

17:18

Shoot

I ended up being much longer. I am missinng sth: *VQmxQd

I wanna golf it now

Jim

That's a good start

But mxQd is overcomplicated

Mr. Xcoder

6 bytes: *VmxQd

@Jim Was just searxhing for a replacement

Jim

Think of what mxQd generates

Mr. Xcoder

I found it

*VU

Jim

@Mr.Xcoder That's it!

Mr. Xcoder

17:23

My turn

caird coinheringaahing

@Mr.Xcoder I have write access :P

Mr. Xcoder

@cairdcoinheringaahing do you want me to remove your write access?

Jim

@Mr.Xcoder Hmm, I won't have time now

Maybe later

Mr. Xcoder

@Jim I'm on mobile too, so great

Later today?

Jim

@Mr.Xcoder Yes

Mr. Xcoder

17:25

@Jim i will be online in ~2 hours

Jim

Okay, I should be around as well

Mr. Xcoder

After that I'm going to go to sleep in ~3

Jim

@Mr.Xcoder Oh, that's early

It would be 10pm at that time where I live

10:30 pm

Mr. Xcoder

It would be 23:30, but I stay in bed for a couple of hours watching movies :) Maybe i'll skip that and train Pyth

I will do so :P

2 hours later…

Mr. Xcoder

19:50

@Jim Are you on?

Jim

20:22

@Mr.Xcoder Now I am

Mr. Xcoder

It's your CMC turn

Jim

Okay

Given an input string containing alphanumeric characters

Replace the runs of digits by the equivalent ASCII character

The runs are guaranteed to represent a valid printable ASCII character

Mr. Xcoder

aaabb -> ab?

Jim

For instance auidt71wbdu98 -> auidtGwbdub

Mr. Xcoder

The digit runs turn into their corresponding letters

Jim

20:27

Yes. Time to practice your regex!

Mr. Xcoder

@Jim What's the chr()in Pyth

@Jim I never use regex 😭

Jim

@Mr.Xcoder C

Mr. Xcoder

@Jim that's gonna be though since I have no idea how a regex works. I suppose it's something like (\d)*, will figure that out

Figured it out: \d+

@Jim Have you already solved it, such that I have a reference byte count?

Jim

@Mr.Xcoder Well, I don't know regex either. But yes, that matches numbers

@Mr.Xcoder No

Mr. Xcoder

@Jim Well, I have no idea how I should solve it, unless I find a workaround with : and C

Jim

20:38

@Mr.Xcoder You can start with :z"(\d+)"3, but that's not gonna give the shortest solution

Mr. Xcoder

Are you already done?!

Jim

I am trying to understand regex(es)

Mr. Xcoder

@Jim Good luck

@Jim May I assume there will be at least one letter and one digit run? (i.e: abc45 is valid, but I won't receive abc or 123 or <empty string> )

Jim

@Mr.Xcoder Yes

Mr. Xcoder

@Jim That makes my life much easier

UNGOLFED, 28 bytes: sm+hdCsedC(:Q"\d+"3:Q"\d+"1)

Don't give golfing tips yet

Jim

20:46

@Mr.Xcoder Aouch. That's kind of long

Mr. Xcoder

@Jim I know

Will golf slowly

26 bytes: K"\d+"sm+hdCsedC(:QK3:QK1)

That's what I have for splitting into letter-digit runs K"\d+"C(:QK3:QK1)

My solution is long and invalid :(

It doesn't handle abc38ab :(

Jim

I still have no working solution, don't worry

Mr. Xcoder

I'll have to leave very soon

Jim

Okay

Mr. Xcoder

Gotta leave!

Bye

Please leave a solution when you are done.

Jim

20:59

Alright, bye!

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