HW Q: Run the code. Explain what it does and how. Explain as many relevant features as you can of the resulting graph.
c1="GOOGL"
c2="GOOG"
df=pdr.DataReader([c1, c2], start="2000", data_source="yahoo")
(df["Adj Close"][c1] / df["Adj Close"][c2]).resample("M").mean().plot()