Python - Replace Value in Text at Random
def replaceAll(file,searchExp,replaceExp):
    for line in fileinput.input(file, inplace=1):
        if searchExp in line:
            line = line.replace(searchExp,replaceExp)
        sys.stdout.write(line)

replaceAll('C:/Users/USERACCOUNT/test/test.js','InterSearchHere', RandomValueFrom2ndTXT)

import random
import itertools as it

def replaceAll(file,searchExp,replaceExps):
    for line in fileinput.input(file, inplace=1):
        if searchExp in line:
            line = line.replace(searchExp,next(replaceExps))
        sys.stdout.write(line)

with open('SecondFile','r') as f:
    replaceExp=f.read().splitlines()
random.shuffle(replaceExps)         # randomize the order of the commands
replaceExps=it.cycle(replaceExps)   # so you can call `next(replaceExps)`

replaceAll('C:/Users/USERACCOUNT/test/test.js','InterSearchHere', replaceExps)