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import pandas as pd
if __name__ == "__main__":
(
pd.read_csv("raw/seaice.csv")
.assign(Month=lambda x: x["Month"].ffill())
.melt(["Month", "Day"], var_name="Year", value_name="Extent")
.query("1980 <= Year.astype('int') < 2020")
.astype({"Day": str})
.dropna()
.assign(Date=lambda x: pd.to_datetime(
x[["Day", "Month", "Year"]].apply(" ".join, axis=1)
))
.loc[:, ["Date", "Extent"]]
.to_csv("seaice.csv", index=False)
)
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