# Configuring h5py

## Library configuration

A few library options are available to change the behavior of the library. You can get a reference to the global library configuration object via the function `h5py.get_config()`. This object supports the following attributes:

> complex_names

>   Set to a 2-tuple of strings (real, imag) to control how complex numbers are saved. The default is (‘r’,’i’).

> bool_names

>   Booleans are saved as HDF5 enums. Set this to a 2-tuple of strings (false, true) to control the names used in the enum. The default is (“FALSE”, “TRUE”).

> track_order

>   Whether to track dataset/group/attribute creation order. If container creation order is tracked, its links and attributes are iterated in ascending creation order (consistent with `dict` in Python 3.7+); otherwise in ascending alphanumeric order. Global configuration value can be overridden for particular container by specifying `track_order` argument to `h5py.File`, `h5py.Group.create_group()`, `h5py.Group.create_dataset()`. The default is `False`.