Blender - Copy BSDF base color to all material slots

import bpy

base_color_hex = (0.01, 0.01, 0.01, 1.0)  # RGBA values for 282828 in Blender

for obj in bpy.context.selected_objects:
    if obj.type == 'MESH':
        for slot in obj.material_slots:
            # Check if the material has a node tree
            if slot.material and slot.material.node_tree:
                principled_node = slot.material.node_tree.nodes.get("Principled BSDF")

                if principled_node:
                    # Set base color to 282828
                    principled_node.inputs[0].default_value = base_color_hex