Changing and resetting default environment variables 

Matplotlib uses the matplotlibrc file to store default values for various environment and figure parameters used across matplotlib functionality. Hence, this file is very long. These default values are customizable to apply for all the plots within a session. 

You can use the print(matplotlib.rcParams) command to get all the default parameter settings from this file.

The matplotlib.rcParams command is used to change these default values to any other supported values, one parameter at a time. The matplotlib.rc command is used to set default values for multiple parameters within a specific group, for example, lines, font, text, and so on. Finally, the matplotlib.rcdefaults() command is used to restore default parameters.