I'm not sure there is enough information to answer your question. The function make_factors() is never defined in the code snippets you provided.

Sorry, I forgot a few lines of code. I only wanted to include the piece of the get_factors() where I pull form_type, since it is what I am trying to use in the screen.
It would look more like this. This is a shortened version, and form_type() is just one of many factors included in the pipeline.

from quantopian.pipeline.data import USEquityPricing, morningstar,Fundamentals  
f = Fundamentals

def make_factors():

   def form_type():  
         return f.form_type.latest  

all_factors = {  
        'form_type':form_type,  
}        
return all_factors  

As a refresher, it is included in the pipeline as follows.

factors = make_factors()

def make_pipeline(factors):  
    factors = {name: f() for name, f in factors.iteritems()}  
    factors['Sector'] = Sector()  
    ft_filter = (factors['form_type'] == '10-Q')  
    return Pipeline(columns=factors,  
                    screen=base_universe & ft_filter  
                   )  

However, I get the following error. "NotImplementedError: couldn't find matching opcode for 'and_bbi'"

Does anyone know why this isn't working?

Hi Zak,

I should have caught this earlier. The problem is in building your ft_filter. When creating a filter from a factor, you need to use the factor's .eq() method as opposed to the == operator. In other words:

ft_filter = factors['form_type'].eq('10-Q')

After making that change, it seemed to run fine. See attached notebook.

@Zak,

Michael's answer is correct, you need to use .eq to make the comparison here. Pipeline terms that have a dtype (data type) of str or int representing a label or categorical value are of type Classifier, not Factor. The == operator is not overloaded in the Classifier class. Instead, you have to use the Classifier.eq method.

If you haven't seen it yet, the Pipeline Tutorial walks through the differences between Factors, Filters, and Classifiers. I'd recommend taking a read through if you haven't already.

I hope this helps!

Thank you both. I have seen the pipeline tutorial, but forgot about the distinctions.

Hi Jamie,

Thanks for clarifying the error in my explanation!