[gnulib-tool-py] if false

[address@hidden]

Hi Bruno,

I continue to work at code of gnulib-tool. Recently I've found the following 
lines:

echo "Update $m4base/gnulib-cache.m4 (backup in $m4base/gnulib-cache.m4~)"
if false; then
  cat "$tmpfile"
  echo
  echo "# gnulib-cache.m4 does here"

Under which circumstances we will do cat? What means if false? I thought that 
we always try to test variables. What equivalent it has in Python? Thanks!