Add column to dataframe with default value

I have an existing dataframe which I need to add an additional column to which will contain the same value for every row.

Existing df:

    Date, Open, High, Low, Close
    01-01-2015, 565, 600, 400, 450

New df:

    Name, Date, Open, High, Low, Close
    abc, 01-01-2015, 565, 600, 400, 450

I know how to append an existing series / dataframe column. But this is a different situation, because all I need is to add the 'Name' column and set every row to the same value, in this case 'abc'.

Im not entirely sure how to do that.

df['Name']='abc' will add the new column and set all rows to that value:

    In [79]:

    df
    Out[79]:
             Date, Open, High,  Low,  Close
    0  01-01-2015,  565,  600,  400,    450
    In [80]:

    df['Name'] = 'abc'
    df
    Out[80]:
             Date, Open, High,  Low,  Close Name
    0  01-01-2015,  565,  600,  400,    450  abc

From: stackoverflow.com/q/29517072

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