How to get a value from a cell of a dataframe?
If you have a DataFrame with only one row, then access the first (only) row as a Series using iloc, and then the value using the column name:
In [3]: sub_dfOut[3]: A B2 -0.133653 -0.030854In [4]: sub_df.iloc[0]Out[4]:A -0.133653B -0.030854Name: 2, dtype: float64In [5]: sub_df.iloc[0]['A']Out[5]: -0.13365288513107493
These are fast access for scalars
In [15]: df = pandas.DataFrame(numpy.random.randn(5,3),columns=list('ABC'))In [16]: dfOut[16]: A B C0 -0.074172 -0.090626 0.0382721 -0.128545 0.762088 -0.7148162 0.201498 -0.734963 0.5583973 1.563307 -1.186415 0.8482464 0.205171 0.962514 0.037709In [17]: df.iat[0,0]Out[17]: -0.074171888537611502In [18]: df.at[0,'A']Out[18]: -0.074171888537611502