I didn’t really get what you mean, but if you want to replace a specific text in your file with a random integer then try:
import fileinput
from random import randint
with fileinput.FileInput(fileToSearch, inplace=True, backup='.bak') as file:
for line in file:
print(line.replace(textToSearch, textToReplace), end='')
with textToReplace = randint(1990, 2020)
Hope that helps
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solved replace the same occurring number with another random number [closed]