How do I get an animated camera's position at every frame with python?

Question

I have a scene - which I have not created - in which the camera and the light set move with every frame (9 in total).

I would like to print out the camera and lights position for every frame using python, ideally in batch mode (so avoiding screen operators).

Right now I manage to get that printed out a million times using a handler like explained here or here but is there a way to do that that works without actually goig through the animations?

Answer 1

You could evaluate fcurves for needed frames so you wouldn't need to change frames and update everything in the scene:

import bpy 


C = bpy.context
sel = C.selected_objects

for frame in range(C.scene.frame_start, C.scene.frame_end+1):
    print("Frame: " + str(frame)) 
    for o in sel: 
        position = []
        for curve in o.animation_data.action.fcurves:
            if curve.data_path == 'location':
                position.append(curve.evaluate(frame))
        print(o.name + ": " + str(position)[1:-1])
    print("\n")

This prints location for all scene frames for all selected objects: