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Learning pandas - Second Edition by Michael Heydt

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Scalar lookup by label or location using .at[] and .iat[]

Individual scalar values can be looked up by label using .at[], passing it both the row label and the column name:

Scalar values can also be looked up by location using .iat[], passing both the row location and then the column location. This is the preferred method of accessing single values and gives the highest performance:

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