Add source example files

source/pandas/pandas_01_columns.py

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+import pandas as pd
+from pandas import DataFrame
+
+from source.pandas import get_dataframe
+
+if __name__ == '__main__':
+    data: DataFrame = get_dataframe()
+    data["height_cm"] = data["height"].map(lambda h: h * 2.54)
+    print(data.groupby("sex").quantile([0.5], numeric_only=True))
+    means = data.groupby("sex").mean(["height", "earn"])
+    means["height_cm"] = means["height"].map(lambda h: h * 2.54)
+    stdevs = data.groupby("sex").std(numeric_only=True)
+    stdevs["height_cm"] = stdevs["height"].map(lambda h: h * 2.54)
+    print(data)
+    print(means)
+    print(stdevs)