[Tutor] Nested, line by line, file reading

[Kent Johnson]

jon vs. python wrote:
> Hi everyone,
> I have a file with this content:
> 
> "1
> 1
> 1
> 1
> 1
> 1
> 1
> 2
> 1
> 1"
> 
> I wanted a little script that would print the line containing "2" and 
> every line containing "1" after it. I've tried this:
> 
>  >>> def p():
>     f = file("prueba.txt",'r')
>     for startline in f.read():

As Bob pointed out, f.read() reads the entire file into a single string. 
Iterating over a string yields individual characters, not lines. So 
startline is actually a single character.

>         if startline.find("2") != -1:

More simply:
   if "2" in startline:

Kent