Two versions of the Python API client are available, depending on the firmware version running on your EMScope instrument.

==== Legacy API — Software ≤ 3.13 ====

The {{ :public:emscope:api.py |}} and {{ :public:emscope:api_example.py |}} files are provided for use with EMScope software versions **3.13 and earlier**.

Required libraries: **websockets, json**. The **matplotlib** library is used in the example script.

==== Current API — Software ≥ 4.0 ====

A fully redesigned API client is available for EMScope software version **4.0 and later**. It introduces a cleaner interface, automatic RBW and display range management, robust session handling, and transparent keepalive ping/pong support.

The {{ :public:emscope:api_v4.py |}} and {{ :public:emscope:api_example_v4.py |}} files are provided.

Required libraries: **websockets**, **matplotlib**. Python **3.8 or later** is required.

For a detailed description of the underlying WebSocket protocol, refer to the [[public:emscope:websocket_api|WebSocket API]] documentation.