🐦 sapsucker

Typed Python wrapper for the SAP GUI Scripting API. For a Go client around the SAP ADT API, check adtler.

sapsucker gives you typed, IDE-friendly access to SAP GUI for Windows. Instead of working with raw COM objects and guessing method names, you get Python classes with autocomplete, type hints, and docstrings for every SAP GUI element.

Named after the sapsucker — a woodpecker that taps into trees to drink their sap. This library taps into SAP GUI to extract your data.

Quickstart

from sapsucker import SapGui

# Connect to running SAP GUI
app = SapGui.connect()
session = app.connections[0].sessions[0]

# Read session info
print(session.info.system_name)   # → "S4H"
print(session.info.user)          # → "DEVELOPER"

# Navigate to a transaction
session.find_by_id("wnd[0]/tbar[0]/okcd").text = "/nSE16"
session.find_by_id("wnd[0]").send_v_key(0)  # Enter

# Read the status bar
print(session.find_by_id("wnd[0]/sbar").text)

Why sapsucker?

• Read a whole screen in one call — container.dump_tree() walks any screen recursively and returns typed ElementInfo, so you can discover element IDs instead of guessing them (the whole subtree in a single COM round trip on SAP GUI >= 7.70 PL3)
• 40+ typed wrapper classes — GuiGridView.get_cell_value(), GuiTree.expand_node(), not generic element.read("cell", row, col)
• IDE autocomplete & type hints on every method and property
• 430+ unit tests, 50+ integration tests verified against real SAP S/4 HANA
• API verified against the SAP GUI Scripting API 6.40 PDF (2969 pages)
• MIT licensed — no GPL restrictions

Installation

pip install sapsucker

Prerequisites

• SAP GUI for Windows (7.x or 8.x)
• SAP GUI Scripting enabled — ask your SAP Basis team to set sapgui/user_scripting = TRUE in transaction RZ11, and enable scripting in your SAP GUI options (Customize Local Layout → Accessibility & Scripting)
• Python 3.11+ on Windows

Usage Examples

Read an entire screen

Don't know a screen's element IDs? Walk it. dump_tree() recurses through every child container and returns validated ElementInfo objects — id, type, name, text, tooltips, accessibility text, geometry and more (sapsucker.models.ElementInfo).

from sapsucker import SapGui
from sapsucker.models import ElementInfo

app = SapGui.connect()
session = app.connections[0].sessions[0]

window = session.find_by_id("wnd[0]")

def walk(elements: list[ElementInfo], depth: int = 0) -> None:
    for element in elements:
        print("  " * depth, element.id, element.type, element.text)
        walk(element.children, depth + 1)   # ElementInfo nests its children

walk(window.dump_tree())                    # full depth by default (safety cap: 200)
# walk(window.dump_tree(max_depth=2))       # or bound it

On SAP GUI for Windows >= 7.70 PL3 dump_tree() uses GuiSession.GetObjectTree under the hood — the whole subtree in a single COM round trip — and falls back automatically to per-property reads on older releases.

Feeding a screen to an LLM? Call session.get_object_tree() directly and ask for only the properties you need instead of the full element record. Unlike dump_tree(), this call has no fallback — it raises on SAP GUI older than 7.70 PL3.

import json

# A JSON *string*, one COM call, only the properties you list
raw = session.get_object_tree("wnd[0]", props=["Id", "Type", "Text"])
tree = json.loads(raw)          # the queried element is tree["children"][0]

# props=None returns Id only — the cheapest possible screen dump
ids_only_json = session.get_object_tree("wnd[0]")

Read an ALV grid

from sapsucker import SapGui
from sapsucker.components.grid import GuiGridView

app = SapGui.connect()
session = app.connections[0].sessions[0]

# Find the grid on the current screen
grid = session.find_by_id("wnd[0]/shellcont/shell")

# Read all rows
for row in range(grid.row_count):
    for col in grid.column_order:
        print(grid.get_cell_value(row, col), end="\t")
    print()

Navigate a tree control

from sapsucker.components.tree import GuiTree

tree = session.find_by_id("wnd[0]/shellcont/shell/shellcont[1]/shell/shellcont[2]/shell")

key = tree.top_node
print(tree.get_node_text_by_key(key))

if tree.is_folder(key):
    tree.expand_node(key)

Fill a form

# Set a text field value
session.find_by_id("wnd[0]/usr/ctxtRS38M-PROGRAMM").text = "RSPARAM"

# Press F8 (Execute)
session.find_by_id("wnd[0]").send_v_key(8)

Context manager

with SapGui.connect() as app:
    session = app.connections[0].sessions[0]
    print(session.info.user)
# All connections closed automatically

More examples

The examples/sapsucker/ directory contains complete runnable scripts, all tested against a real SAP system:

• basic_navigation.py — connect, read session info, navigate transactions
• alv_grid_export.py — query SE16N and read ALV grid data
• form_filling.py — fill selection screens and execute reports
• tree_navigation.py — browse and expand tree controls in SE80
• screen_introspection.py — walk a whole screen with dump_tree() and dump it as JSON

Monitoring a session while a human records

sapsucker.monitor samples a live session so a recording made with SAP GUI's own recorder (Alt+F12 → Script Recording and Playback) can be paired with timestamps. A recorded .vbs has none, so it cannot tell you where the person paused — which is usually where they were deciding — nor that they went back to re-check a field, nor whether the save actually worked.

pip install sapsucker[cli]

sapsucker-monitor -o timing.jsonl \
  --watch "wnd[0]/shellcont/shell:FirstVisibleRow"

Start it, start the recorder, do the task, stop both. --watch takes any element_id:ComProperty pair and is repeatable — the example above timestamps each individual ALV scroll.

A prebuilt Windows .exe is attached to each release for machines without a Python toolchain.

As a library:

from sapsucker.monitor import SessionMonitor, Watch

monitor = SessionMonitor(session, watches=[Watch(element_id="wnd[0]/shellcont/shell", prop="FirstVisibleRow")])
for sample in monitor.samples():      # generator: the caller owns the loop, and the thread
    if sample.changed:
        print(sample.elapsed, sample.changed, sample.gap_since_change)

samples() never starts a thread. COM is STA, so a monitor loop occupies its thread for its whole lifetime — see the sapsucker.monitor module docstring.

Architecture

sapsucker wraps the SAP GUI Scripting COM API as a hierarchy of typed Python classes:

GuiApplication
  └── GuiConnection
       └── GuiSession
            └── GuiMainWindow
                 ├── GuiToolbar
                 ├── GuiMenubar
                 ├── GuiStatusbar
                 └── GuiUserArea
                      ├── GuiTextField, GuiLabel, GuiButton, ...
                      ├── GuiTableControl (classic dynpro tables)
                      ├── GuiGridView (ALV grids)
                      ├── GuiTree (tree controls)
                      ├── GuiTabStrip → GuiTab
                      └── GuiAbapEditor / GuiTextedit

Elements are discovered via session.find_by_id(sap_id), which returns the correct typed wrapper automatically (e.g., GuiGridView for an ALV grid, GuiTree for a tree control). The factory dispatches on TypeAsNumber and SubType COM properties.

Thread Safety

COM objects use the Single-Threaded Apartment (STA) model. All calls to a given SAP GUI session must happen from the same thread that called pythoncom.CoInitialize(). See the _com.py module docstring for details and an asyncio.to_thread() example.

API Overview

Contributing

Contributions are welcome! Please open an issue first to discuss what you'd like to change.

For detailed setup instructions (uv dependency groups, CI, linting, formatting, etc.), see the Hochfrequenz Python Template Repository.

# Clone and install dev dependencies
git clone https://github.com/Hochfrequenz/sapsucker.git
cd sapsucker
uv sync --group dev

# Run unit tests (no SAP required, works on any OS)
uv run pytest unittests/ -v

Integration tests against real SAP

Integration tests run against a real SAP GUI system and are automatically skipped on machines without SAP access. To run them locally:

1. SAP GUI for Windows must be running with scripting enabled
2. Create a .env file with your SAP credentials:

   SAP_CONNECTION_NAME=your_connection
   SAP_USER=your_user
   SAP_PASSWORD=your_password
   SAP_MANDANT=your_client
   SAP_LANGUAGE=EN
   

3. Run:

   uv run pytest unittests/ -k integration -v
   

Integration tests run by default on any local machine and are automatically skipped in CI (GitHub Actions). Set SAP_SKIP_INTEGRATION=1 to skip them locally. They cover SE80, SE16N, SE37, SE38, and SM37 — all read-only, no SAP data is modified.

License

MIT