PostreSQL SQL for MySQL SQL

Hi,

I'm fairly new to PostreSQL, coming from MySQL. My Python application
generates these MySQL commands:

    drop database if exists Foo;
    create database Foo;
    use Foo;

Using the PostgreSQL online docs, my closest translation is:

    drop database Foo;
    create database Foo;

What I'm missing is:
    * "if exists" for the drop, in order to avoid an error the very first time
this program runs
    * the "use Foo;"

Can I do these things in PostreSQL from SQL (e.g., not from the command line)?


-Chuck