Select 50 items from list at random to write to file

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So far I have figured out how to import the file, create new files, and randomize the list.

I"m having trouble selecting only 50 items from the list randomly to write to a file?

def randomizer(input,output1="random_1.txt",output2="random_2.txt",output3="random_3.txt",output4="random_total.txt"):

#Input file 
    query=open(input,"r").read().split()
    dir,file=os.path.split(input)

    temp1 = os.path.join(dir,output1)
    temp2 = os.path.join(dir,output2)
    temp3 = os.path.join(dir,output3)
    temp4 = os.path.join(dir,output4)


    out_file4=open(temp4,"w")

    random.shuffle(query)

    for item in query:
        out_file4.write(item+"
")   

So if the total randomization file was

example:

random_total = ["9","2","3","1","5","6","8","7","0","4"]

I would want 3 files (out_file1|2|3) with the first random set of 3, second random set of 3, and third random set of 3 (for this example, but the one I want to create should have 50)

random_1 = ["9","2","3"]
random_2 = ["1","5","6"]
random_3 = ["8","7","0"]

So the last "4" will not be included which is fine.

How can I select 50 from the list that I randomized ?

Even better, how could I select 50 at random from the original list ?

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