light_fire_flickering.py

import bpy
import random

random.seed(0)

(start,end,step)=(61,1401,2)
(x,y,z)=(0.294123,0.833412,0.436287)
(fx,fy,fz) = bpy.data.objects['FireLight'].animation_data.action.fcurves

def flickering(f, center):
	keyframe_points = f.keyframe_points
	for frame in range(start,end,step):
		value = center+random.uniform(-0.02,+0.02)
		keyframe_points.insert(frame=frame, value=value)
	f.update()

flickering(fx,x)
flickering(fy,y)
flickering(fz,z)