Python Forum

I'm practicing with opening, reading and appending to files. One of my goals was to open the file for the second time within the program and append a sliced segment from the original file. I was able to write the sliced segment, but I am lost on how to get it to drop to the next line. \n doesn't work in slicing. I have included the source code first and then divided the code with the output on the bottom.

with open("PythonSourceCode", "w") as python_file:
    content = python_file.write("with open(\"PythonSourceCode\", \"w\") as python_file:")

with open("PythonSourceCode", "a+") as My_Python_File:
    My_Python_File.seek(0)
    New_Content = My_Python_File.write("\nThis is practice")

with open("PythonSourceCode") as The_Final_Product:
    The_Final = The_Final_Product.read()

print(The_Final)

The_Final_Product.close()

with open("PythonSourceCode", "a+") as change:
    change.seek(0)
    new = change.read()
    newest = change.write(new[11:28])

with open("PythonSourceCode") as One_More:
    Last_One = One_More.read()

print(Last_One)

Output:
with open("PythonSourceCode", "w") as python_file:
This is practice
with open("PythonSourceCode", "w") as python_file:
This is practicePythonSourceCode"

I'm running Ubuntu with python version 3.6

Probably not the answer you are looking for, but automatic newline is added with print(). So one can do:

with open('sample.txt', 'w') as f:
    print('First row', file=f)

with open('sample.txt', 'a') as f:
    print('Second row', file=f)

Which results the sample.txt to have following content:

Output:
First row
Second row

Why not just write('\n') after writing the slice?

just try

newest = change.write('\n'+new[11:28])