Script to upload images to ERPNext Item Page

image_script.py

import frappe
def execute():
    files = frappe.get_all(
        "File",
        filters={"is_folder": 0},
        fields=["name", "file_name", "file_url"],
    )

    for file in files:
        fname, fext = file.get("file_name").split(".")
        if fext not in ["png", "jpg", "jpeg"]:
            continue
        has_existing_item = _check_existing_item(fname)
        if not has_existing_item:
            continue

        frappe.db.set_value("File", file.get("name"), "attached_to_doctype", "Item")
        frappe.db.set_value("File", file.get("name"), "attached_to_name", fname)

        item_doc = frappe.get_doc("Item", fname)
        item_doc.image = file.get("file_url")
        item_doc.save()

        print("Item {} has been set.".format(fname))


def _check_existing_item(name):
    return len(frappe.get_all("Item", filters={"name": name})) == 1

Image file name should be exactly same as Item Name.

bench --site [site name] execute [dir name].image_script.execute