Given

  /home/a
  /home/a/k.py
  /home/a/c/j.py
  /home/b/z.py
  /home/b/c/f.py

and a current directory of /home/a, we'd have:

   pattern     matches
   -------     -------
   *.py        k.py, c/j.py
   c/*.py      c/j.py
   c*          c
   ../*.py     ../a/k.py, ../a/c/j.py, ../b/z.py, ../b/c/f.py
   ../c/*.py   ../b/c/f.py, ../a/c/j.py

For relative paths the double dots decide where to start walking and from then on you can imagine a glob on every subdir. In the last 2 examples the glob would have been '*.py' and 'c/*.py' respectively.