Seeking PL/PGSQL example

Guys,

I'm getting started with PL/PGSQL but want to understand if the following
is even possible:

With PL/PGSQL, how would I roll through all tables in my database and
print the table name, along with the row count of that table?

Sorry if this is too simplistic.  I've googled but must not be phrasing my
question properly.  Currently reading through the manual, but if someone
has any helpful tips I'd appreciate it.

Thanks!
John