CODEWITHSUNDEEP
pythonnumpyrandom
Engineering45
Engineering45

Reputation: 37

How to choose random value from array, then choose randomly again excluding the value just chosen?

I am trying to create a combination of unique phrases to make a sentence and want to randomly select a phrase length from S (only needs to happen 1 time), and then randomly select first a J value, and then a random Q value, but I do not want the same value selected from J or S selected. How can I do this?

Here is what some of the sample outputs look like:

I3 and I1 I4 not I5 I5 or I4 and I3 not I3

Q=("but","why","okay")
J=("J1","J2","J3","J4","J5")
S=[(J), (J,Q,J), (J,Q,J,Q,J),(J,Q,J,Q,J,Q,J)]

' '.join([random.choice(i) for i in random.choice(S)])

Upvotes: 0

Views: 163

Answers (2)

Amadan
Amadan

Reputation: 198526

Shuffle both arrays, then take elements as you need, one by one. Or sample them, if you don't want to have the originals perturbed:

Q=("but","why","okay")
J=("J1","J2","J3","J4","J5")
S=[(J,), (J,Q,J), (J,Q,J,Q,J), (J,Q,J,Q,J,Q,J)]

from random import sample, choice
from collections import Counter

seq = choice(S)
iters = { s: iter(sample(s, c)) for s, c in Counter(seq).items() }
result = ' '.join(next(iters[s]) for s in seq)

So I pick the desired sequence first. Then I count how many times does each list appear in the chosen sequence. Then, for each unique list, I take as many random elements (without repetition) as there are appearances of the list in the sequence, then make an iterator for those choices, so I can get them one by one. The last thing left to do is to iterate over the sequence, and take the next element from the appropriate iterator.

Upvotes: 1

Phan Huu Tho
Phan Huu Tho

Reputation: 76

I hope it helps

result = []
temp = S
while temp is not empty:
   random1 = random.choice(temp)
   value = random.choice(random1)
   result.append(value)
   temp2 = random1.remove(value)
   temp = temp.remove(random1)
   if temp2 is not empty:
      temp = temp.append(temp2)

print(' '.join(result))

The key idea is that we will remove the chosen value before the next random

Upvotes: 0

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