Python, pandas: how to sort dataframe by index

When there is an DataFrame like the following:

    import pandas as pd
    df = pd.DataFrame([1, 1, 1, 1, 1], index=[100, 29, 234, 1, 150], columns=['A'])

How can I sort this dataframe by index with each combination of index and column value intact?

Dataframes have a sort_index method which returns a copy by default. Pass inplace=True to operate in place.

    import pandas as pd
    df = pd.DataFrame([1, 2, 3, 4, 5], index=[100, 29, 234, 1, 150], columns=['A'])
    df.sort_index(inplace=True)
    print(df.to_string())

Gives me:

         A
    1    4
    29   2
    100  1
    150  5
    234  3

From: stackoverflow.com/q/22211737