creating input nodes

input.py

import bpy
from mathutils import Vector

ng = bpy.data.node_groups[0]
nodes = ng.nodes
n = nodes.active

ndict = n.node_dict
hash = list(ndict.keys())[0]
defaults = ndict[hash]['node_function'].__defaults__
num_params_in = len(defaults)

divided_height = (n.height + (20*num_params_in)) / num_params_in

for idx, (_input, value) in enumerate(zip(n.inputs, defaults)):
    a = '{input.name} -> {value}'.format(input=_input, value=value)
    print(a)

    new_node = None
    if isinstance(value, int):
        new_node = nodes.new('IntegerNode')
        new_node.int_ = value
    elif isinstance(value, float):
        new_node = nodes.new('FloatNode')
        new_node.float_ = value
        
    if new_node:
        horizontal_offset = Vector((-170, 0))
        vertical_offset = Vector((0, -divided_height))
        new_node.location = n.location + horizontal_offset + (vertical_offset * idx)
        new_node.hide = True
            
        _from = new_node.outputs[0]
        _to = n.inputs[_input.name]
        ng.links.new(_from, _to)