Q:

python find if newline is in string

I am trying to find if a "\n" character is in a string using this:
if "\n" in errors.text

This works fine for a string like "one\ntwo" but when the newline is at the end of the string like "one\n", it doesn't seem to work. I am using selenium to get this string from a website. Is it possible that it is not catching the newline at the end and simply not including it? 
Or could this be the problem?
fixedText = errors.text.split("\n")[0]

I want the fixed text to remove all newlines and only get the first line of text. It works except for the case discussed above

A:

If you want the fixed text to only be the first line in a string, you can do this:
if errors.text: # skips empty strings
    fixedText = errors.text.split("\n")[0]

This is because split() is reasonably robust:
>>> 'a'.split()[0]
'a'
>>> 'a\n'.split()[0]
'a'
>>> 'a\n1'.split()[0]
'a'
>>> ''.split()
[]

That last example demonstrates why we check for an empty string before trying to index the resulting list.

