I have a 2007 pontiac g5 gt that the headlights will not turn off. The only way to turn them off is to pull the fuses or to unplug the battery

None, just replace the switch. The flashers are controlled by the Body Control Module and you can't disconnect that.

Pontiac G5 (2007-2010) fuses and relays

https://fuse-box.info > pontiac > pontiac-g5-2007-2010...

In this article, you will find fuse box diagrams of Pontiac G5 2007, 2008, 2009 and 2010, get information about the location of the fuse panels inside the car, ...

On this website (link below) you find fuse box diagram and description for Pontiac G5 (2007)

Pontiac G5 2007 fuse box diagram Auto Genius

It should be on the bottom of the radiator, a small plastic thumb screw.

You may have to remove the plastic tray under the car to find it.

do the lights turn off when you try and start it?

Front Headlamp Assembly Bolt (Qty: 2)
Notice: Refer to Fastener Notice in the Preface section.
Tighten
10 N·m (89 lb in)
Procedure

1. Remove the two upper headlamp bolts from the upper tie bar and front fender bracket.
2. Pull the lamp forward until the lamp disengages from the lower bracket.
3. Push the lower inside corner of the headlamp inboard until the outer lens releases from under the outer fender flange.
4. Rock the headlamp composite side to side and pull outward.
5. Aim the headlamps after replacement. Refer to Headlamp Aiming.

Look in your owner's manual. They'll tell you which bulbs to buy and how to replace one.
It's a very simple procedure. Lift up your hood and look at your headlights. You can see the connector on the back of the headlight.

For jumping connection it is under the hood, directly between the red capped post and the driver side. It says GRD on the post. Good luck.

Check the fuse.

The floor console fuse block is located on the
passenger's side of the floor console behind the
forward panel. The panel has three clips. Pull
the panel to disconnect the three clips, and access
the fuses. Use the fuse puller to remove fuses.