human
Solve the following python programming problem given the following code:
# Custom Factor 4 : Price to Trailing 12 Month Cashflow
class Price_to_TTM_Cashflows(CustomFactor):
    inputs = [morningstar.valuation_ratios.pcf_ratio]
    window_length = 1
    
    def compute(self, today, assets, out, pcf):
        out[:] = -pcf[-1] 
        
# create the pipeline
temp_pipe_4 = Pipeline()

# add the factor to the pipeline
temp_pipe_4.add(Price_to_TTM_Cashflows(), 'Price / TTM Cashflows')

# run the pipeline and get data for first 5 equities
run_pipeline(temp_pipe_4, start_date='2015-11-11', end_date='2015-11-11').head()
Given the above code, generate some markdown instructions for it.
assistant
#Here is the Python code you requested.

Price to Trailing 12-Month Cashflows
This is calculated as a simple ratio between price per share and TTM free cashflow  (here using the built-in Morningstar valuation ratio as an approximaton).
This ratio serves a similar function to the previous two. A future notebook will explore the subtle differences in these metrics, but they largely serve the same purpose. Once again, low values are attractive and high values are unattractive, so the metric must be inverted.