blender8r

# Generates grease pencil line 

import bpy
import random


def line(gp_frame, start_pos, end_pos, num_pts):
    gp_stroke = gp_frame.strokes.new()
    gp_stroke.line_width = 30
    

blender8r

# Generates grease pencil points with random position, size and color

import bpy
import random


sel_obj = None  
sel_objs = bpy.context.selected_objects

if sel_objs:

blender8r

import bpy

gpencil_data = bpy.data.grease_pencils.new("GPencil")
gpencil = bpy.data.objects.new(gpencil_data.name, gpencil_data)
bpy.context.collection.objects.link(gpencil)

gp_layer = gpencil_data.layers.new("lines")

gp_frame = gp_layer.frames.new(bpy.context.scene.frame_current)