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insert single value in dataframe using index

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

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insert single value in dataframe using index

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