save data in a json flie without overwriting existing file in python

save data in a json flie without overwriting existing file in python

i need to add data in an json file without overwriting.

i need to add data in an json file without overwriting.

the code am using is:

import json

data=[]

def arr(): x=0 while x<1: print(x) x-=1 X.append(x) data.update(x) with open('x.txt','w')as outfile: json.dump(data,outfile)

arr() print(X)

this one works file.But,while am running this code second time it overwrites the existing values in the text file.help me to solve this code

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