Add source example files

source/pandas/01-pandas-manual/03-dataframe-index-demo.py

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+"""
+Create a DataFrame and use indexes to
+"""
+import pandas as pd
+
+# Create a dataframe and associate an index to it
+df = pd.DataFrame(
+    data={"name": ["Mac", "Ann", "Rob"], "age": [33, 44, 55]},
+    index=["u1", "u2", "u3"]  # as many values as rows
+)
+
+# Show normal DataFrame
+print(df)
+
+# Access one row using an index value
+print(df.loc["u1"])
+
+# Access the same row using a numerical index
+print(df.iloc[0])
+
+# Get a DataFrame with a selection of lines
+# To extract this, the selection of lines **must** be a list and not a tuple;
+# the tuple is used to select or slice in the other axis.
+print(df.loc[["u1", "u3", "u2"]])
+
+# Show the index0
+print(df.index)