シーンに存在するすべてのライトをコピーするpythonスクリプトは以下の通りです：
```
import bpy

# Get all the lights in the scene
lights = [obj for obj in bpy.context.scene.objects if obj.type == 'LIGHT']

# Create a new list to hold the copied lights
copied_lights = []

# Create copies of each light and add them to the scene
for light in lights:
    # Duplicate the light object
    new_light = light.copy()
    new_light.data = light.data.copy()
    # Link the duplicated object to the scene
    bpy.context.scene.collection.objects.link(new_light)
    # Add the new light to the list of copied lights
    copied_lights.append(new_light)
```
Here is the python script to copy all the lights present in the scene:
```
import bpy

# Get all the lights in the scene
lights = [obj for obj in bpy.context.scene.objects if obj.type == 'LIGHT']

# Create a new list to hold the copied lights
copied_lights = []

# Create copies of each light and add them to the scene
for light in lights:
    # Duplicate the light object
    new_light = light.copy()
    new_light.data = light.data.copy()
    # Link the duplicated object to the scene
    bpy.context.scene.collection.objects.link(new_light)
    # Add the new light to the list of copied lights
    copied_lights.append(new_light)
```