r+ mode in files

[DeaD_EyE]

You could use fd.seek() to jump to the end of the file:

with open("file.txt", "w") as fd:
    for line in range(1, 5):
        fd.write(f"Welcome to Python line {line}\n")


with open("file.txt", "r+") as fd:
    print("Position after open:", fd.tell())
    fd.seek(0, 2)
    print("Position after seek:", fd.tell())
    fd.write("Hello World\n")


with open("file.txt", "r") as fd:
    print(fd.read())

Docs: https://docs.python.org/3/library/io.htm...OBase.seek