MetaTrader 5 + Python Bot Architecture

How the official MetaTrader5 Python package connects to the terminal, where it is useful, and what to run on a Windows VPS for 24/7 operation.

What the Python package actually connects to

The official MetaTrader 5 Python integration does not bypass the desktop terminal. The MetaTrader5 package communicates directly with a MetaTrader 5 terminal. initialize() establishes the connection and can launch the terminal when necessary.

import MetaTrader5 as mt5

if not mt5.initialize():
    raise RuntimeError(f"MT5 initialize failed: {mt5.last_error()}")

info = mt5.terminal_info()
tick = mt5.symbol_info_tick("EURUSD")
positions = mt5.positions_get(symbol="EURUSD")

print(info)
print(tick)
print(positions)
mt5.shutdown()

Three useful architectures

1. Pure MQL5 Expert Advisor

Best when the logic fits naturally in OnTick, OnTimer and trade events. It is easy to test in the MT5 Strategy Tester and deploy to MetaTrader VPS.

2. Python + MT5 terminal on a Windows VPS

Useful when you need pandas, machine-learning libraries, external databases or Python services. Run the terminal and Python side by side, supervise the Python process and add health checks for both.

3. MQL5 execution + external Python service

Keep execution-critical logic inside MT5 while a separate Python service performs research, model inference or data preparation. Connect them through a deliberately designed bridge such as files, local sockets or HTTP — with authentication and clear failure behavior.

Important Python limitations

MetaQuotes documents that Python integration does not provide native event handlers such as OnTick or OnTradeTransaction. A Python-only design may need polling or an MQL5 bridge. That matters for event-driven execution and detailed trade-state handling.

When Python is worth it

Python is strongest for data analysis, machine learning, batch research, model evaluation and integration with non-MetaTrader services. For a simple deterministic EA, native MQL5 can be smaller and easier to operate.