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how to get PEG ratio?

hi guys.

Looked around for a little bit but cannot seem to get peg ratio.
I tried the following, the other ratios seem good but PEG returns all "None."

    f_df = get_fundamentals(  
        query(  
            fundamentals.operation_ratios.roa,  
            fundamentals.valuation_ratios.pe_ratio,  
            fundamentals.valuation_ratios.peg_ratio,  
            fundamentals.valuation_ratios.ev_to_ebitda  
        )  
    )  
> f_df.T  
DataFrame:  
                                roa pe_ratio peg_ratio ev_to_ebitda  
security  
Equity(2 [ARNC])           0.011841  33.8983      None      11.0939  
Equity(6 [AACE])           0.007221  78.7402      None          NaN  
Equity(14 [AALA])         -0.037904      NaN      None      -9.4172  
Equity(21 [AAME])          0.004314  22.0264      None       2.4126  
Equity(24 [AAPL])          0.010916  36.9004      None       6.6863  
Equity(25 [ARNC_PR])       0.011841      NaN      None          NaN  
Equity(31 [ABAX])          -0.00447  113.636      None      38.2661  
Equity(32 [ABBK])          0.001424   14.556      None          NaN  
Equity(37 [ABCW])          0.002625  12.7714      None      18.6034  
Equity(47 [RINO])               NaN      NaN      None          NaN  
Equity(48 [ABIX])            0.0204   7.1429      None          NaN  
Equity(49 [ABK])           0.009992   14.556      None      10.8195  
Equity(51 [ABL])           0.007371  17.2117      None       4.9604  
...
1 response

where does this get_fundamentals method come from? is it a quantopian library or a custom method?