Python - Creating a program that changes itself

Question

I would like to create a program that is able to change itself, that is, I run the script, and it changes the script itself, creating a kind of bookmark.

The big problem is that I can’t change the program when it’s running, as I did below:

arq = open("./01_programa_alterar.py")
lines = arq.readlines()

x = False  # lines[4] = "x = True\n"

if x:
    print("Você Alterou o script")
else:
    print("Script não alterado")


#----mudar script----
lines[4] = "x = True\n"  # Pulo do gato

for line in lines:
    arq.write(line)
#--------------------

arq.close()

I would like to know if there is any module that makes this change :(

Answer 1

This is how I made it work:

#Ler arquivo
arq = open(__file__, 'r')
lines = arq.readlines() #Leremos por aqui
arq.close()

x = False

if x:
    print("Você Alterou o script")
else:
    print("Script não alterado")

#Escrever arquivo (Não ler linhas)
arq = open(__file__, 'w')

#----mudar script----
lines[5] = "x = True\n"

for line in lines:
    arq.write(line)
#--------------------

arq.close()

I was forgetting to close the file and then open it again with, only on as "w" open(file,'w') ...