Write Append.

open modes: - "w" — write (create or overwrite) - "a" — append at end

with open("log.txt", "w", encoding="utf-8") as f: f.write("start\n") with open("log.txt", "a", encoding="utf-8") as f: f.write("end\n")

with open("log.txt", encoding="utf-8") as f: print(f.read())

write() does not add a newline — you add \n yourself.