insert single value in dataframe using index

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Tess
29 May 2016
1>>> df = pd.DataFrame([[0, 2, 3], [0, 4, 1], [10, 20, 30]],
2               index=[4, 5, 6], columns=['A', 'B', 'C'])
3>>> df.at[4,'B']
42
5>>> df.at[4,'B'] = 10
6>>> df.at[4,'B']
710
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