How to avoid "f.close" (no parens) bug?

[Batista, Facundo]

Skip Montanaro wrote:

#- Pychecker reports:
#- 
#-     % pychecker foo.py
#-     name: foo
#-     Processing foo...
#- 
#-     Warnings...
#- 
#-     foo.py:4: Statement appears to have no effect

Why "appears"?

There is any case when f.close, or bar or something like "not a call to a
function (there is no ')'), with no '=' at the left or at the right" has any
effect?

If no, could Python alert before run time?

I don't see nothing, but I'm kinda blind, :p

.	Facundo