Simple modular Programm

[nilamo]

          run="true"                                        
          while run=="true":                                
              a=input(line)                                 
              line=line+1                                   
              if a=="//end":                                
                  run="false" 

Why is run a string? There's a boolean type that's perfect for this:

run = True
while run:
    # do something
    if #some condition :
        run = False