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[RaiMan <question205802@xxxxxxxxxxxxxxxxxxxxx>]

Question #205802 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/205802

    Status: Open => Answered

RaiMan proposed the following answer:
Interesting approach, but Sikuli script does not work, as you seem to
expect ;-)

when your script starts, all the exists() are processed and most of them
I guess evaluate to None, since the images are not visible on the screen
at that moment.

I guess you think, that the search takes place, at the time, the
variable is used in your script:

e.g. you say:
iron1 = exists(Pattern("1344920814078.png").similar(0.85))

and use later
    if iron1:

expecting, that the search takes place now.

but that is not the case, sorry ;-)

But it is rather easy to repair with Pythonbs lambda feature:

iron1 = lambda : exists(Pattern("1344920814078.png").similar(0.85))

this turns iron1 into a callable function, that returns the result of
the exists at use time

usage later:

    if iron1():

the bracket pair is needed, to tell Python that the function saved in
iron1 should be called.

This is the best way, to get your script running as you expect with
little systematic changes (insert some lambda : and some ()) while
keeping your (very good) naming scheme and script structure.

But it is a very uncommon way.

Normally you would have the exists() in the places where you use the
names:

instead for the iron1 case

- no definition of iron1 at the beginning
- usage: if exists(Pattern("1344920814078.png").similar(0.85))

An approach, that ends up in a similar naming and script structure would
be:

again your iron1 case:

iron1 = Pattern("1344920814078.png").similar(0.85) # this is a "static"
definition

and usage later:
   if exists(iron1):

This approach has other advantages:
- you can ajust the exists() later on in the workflow with a specific waiting time, e.g.
   if exists(iron1, 5):
- you can restrict the search region during your workflow, e.g.
   if some_region.exists(iron1):
making your script more robust and faster.

there are some interesting topics on such problems in the faqs.

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