how to create a program that writes a print("hello world"), in the main file where the original program was written? IN PYTHON

Question

how to create a program that writes a print("hello world"), in the MAIN file where the original program was written? IN PYTHON

If I want to run a program that WRITES a print("hello world") in the code of my MAIN FILE, where I wrote the original program, how would I do that? IN PYTHON

I thought something like:

 import main


 with open("main.py " , "a+") as file_object:
    
      file_object.seek(0)

      data = file_object.read(100)

      if len(data)>0:

            file_object.write("\n")

      file_object.write('print("hello world)')

but the console shows this:

ValueError: I/O operation on closed file.

Answer 1

From my understanding, you are trying to determine if a file has content and if it does include a new line, and then append the print statement.

You do not need to use seek you can just check the size of the file:

import os

if os.path.getsize(filename):
    # file isn't empty
else:
    # file is empty

You should also close the quotation marks in your print statement

Answer 2

You can use __file__ which gives you the path of your file and then append your text to it.

path = __file__

f = open(path, "a")
f.write('\nprint("hello world")')
f.close()

Answer 3

you wrong because Indent correctly, like this. You can modify like:

import main


with open("main.py" , "a+") as file_object:

    file_object.seek(0)
    data = file_object.read(100)
    if len(data)>0:
        file_object.write("\n")

    file_object.write('print("hello world")')