# Preamble
i = 0 # Will be incremented across each file
this_script = open(f"main{i}.py", "r") # Open this script
new_script = open(f"main{i + 1}.py", "w+")
new_script.write(this_script.read().replace("0", "0 + 1")) # Replace i = 0 + ... with i = 0 + .... + 1
new_script.close()
this_script.close() # Create new script

# Actual code
print(i**2)

# Postamble
exec(f"import main{i + 1}") # Run the new module