The "junk" parameter in difflib.sequencematcher

[shuhsien]

Hi,

I am confused by the junk parameter in the difflib.sequencematcher. I
thought it would simply ignore everything that's returned true by the
junk function. However, I have results as follows:

sequencematcher(lambda x: x == ' ', "lion", "li on").ratio() 0.88888888888888884 sequencematcher("lion", "li on").ratio() 0.0 sequencematcher(lambda x: x == ' ', "lion", " lion ").ratio()

0.80000000000000004

It's not ignoring the blanks, and when comparing "lion" and "li on",
when nothing is considered junk, the similarity ratio is 0!

What am I missing here?

-shuhsien