The module contains the core submodules of pandas. They are discussed as follows:
- api.py: This imports some key modules and warnings for later use, such as indexing, groupby, and reshaping functions.
- apply.py: This module contains classes that help to apply a function to a DataFrame or series.
- arrays: This isolates pandas' exposure to numpy—that is, all direct numpy usage. The base.py submodule of array handles all array-oriented operations, such as the ndarray value, shape, and ndim, while the categorical.py submodule caters specifically for categorical values.
- base.py: This defines fundamental classes such as StringMixin and PandasObject, which is the base class for various pandas objects, such as Period, PandasSQLTable,
