How to print/handle progress

[awilson]

Lots of processes take an optional argument like:

progress (Callable[[float], None]) – Progress callback.

I was trying to implement it like this:

Code: [Select]

class ProgressPrinter( object ):
  def __init__( self, name ):
    self.name = name
  def __call__( self, percent ):
    print("%s Progress: %f%"%(self.name, percent))
    sys.stdout.flush()

But that gives me an error:

Code: [Select]

RuntimeError: incomplete format
I thought that was everything needed for something to be recognized as callable. Does anyone have a working example of how to handle the progress?

Thank you!

[awilson]

Any guidance on this? I'm running reconstructions via the command line, so I don't have the benefits of the gui progress bar. It would be REALLY nice to be able to know where I am in the current stage. Thanks!

[Ryan Fox]

It's running into trouble on your last percent sign - Python is interpreting that as another substitution, and expecting a format spec to follow.  You can escape the last percent by putting two of them:

Code: [Select]

print("%s Progress: %f%%" % (self.name, percent))
You can also use the newer .format() style:

Code: [Select]

"{} Progress: {}%".format(self.name, percent)

[awilson]

 

Well that's embarrassing. Thanks for catching that, this is working fine now that I've gotten out of my own way.