Help~~how to get random in every branch in datatree?

the every branch should be different random,but now is the same random ,i tried different seed in every branch loop(in Bold),but it has no effects,thank you for help~~~

import random
import rhinoscriptsyntax as rs
import Grasshopper as gh
dt= gh.DataTree[int]()
Length=10000
brickLength=(2000,1500)
brickLengthList=[]
sumLength=0
LastTempLength=0
tempLength=0
sameCount=0
for i in range(4):
    p=gh.Kernel.Data.GH_Path(i)
    random.seed(i)
    while sumLength<Length:
        
        tempLength=random.choice(brickLength)
        if tempLength==LastTempLength:
            sameCount+=1
        if sameCount>=2:
            sameCount=0
            continue
    
        LastTempLength=tempLength
        brickLengthList.append(tempLength)
        sumLength+=tempLength
    dt.AddRange(brickLengthList,p)

a=dt