Detect if there is a number at the beginning of an input

Question

I am making an apple ][ (2) emulator, and I am working on the last part, writing the code

What I want to happen is when somebody inputs the following:

20 x = 0

In the file, on line 20, it should put:

x = 0

When looking it up, I cant find anything to help with it, other then checking the whole string for numbers.

The 3 problems are:

1. writing to the correct file line
2. not writing the file line number to the file line
3. removing any blank lines

an example for 3 is:

Well say this is the file were using:

x = 0



while True:
    
    
    
    
    if x = 9:
        
        
        
        
        x = 0
        
    
    
    
    x += 1

if somebody inputs '20', the file then should look like this:

x = 0



while True:
    
    
    
    
    if x = 9:
        
        
        
        
        x = 0

Rather then this:

x = 0



while True:
    
    
    
    
    if x = 9:
        
        
        
        
        x = 0
 
 
 
 
 

Answer 1

You use .split

You take the obj 0, then use that for placements as far as placing on a specific line goes, you have to make the whole file a list, then write to the list object, then rewrite it to the file.