Mastering pandas - Second Edition

Accessing attributes using the dot operator

To access a single entity (a column, value, or item), the square bracket operator can be replaced by the dot operator. Let's subset colA in the DataFrame using the dot (.) operator:

df.colA

This results in the following output:

Slicing a column with the dot operator

By using two dot operators in a chain, an individual element can be accessed:

In: df.colA.R3Out: -2.089066

This is also applicable to Panels and Series. However, unlike the square bracket operator in Series, the positional index cannot be used here. For the dot operator to be used, the row labels or column labels must have valid names. ...