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PyTrading is a sandbox stock market project written in Python 3.
This project has an educational purpose to learn how financial markets work.

GNU/Linux	Windows	Static analysis	Code coverage

To generate Protobuf "_pb2.py" files:

$ protoc --python_out=. *.proto`

• An order is composed of a price, a quantity, a way (buy or sell) and the instrument you want to trade (e.g. Apple stock)
• A deal is generated when there is a match between two orders on same price and same instrument (order book's last price is updated)
• An order book hosts every incoming orders waiting to be executed (most interesting price comes first)

• TradingServer is composed of two servers: a matching engine and a feeder.
  • MatchingEngine accepts orders from clients and try to match them.
  • Feeder streams continuously order books content (full snapshot).
• TradingClient connects two client sockets: an ordersender and a feedhandler.
  • OrderSender sends order according to algorithm implemented in main_loop_hook
  • FeedHandler receives order book updates (e.g. price modified, executed order etc..)

TradingServer and TradingClient communicates via TCP/IP serialized messages.
Two serializations are available: plain text (pipe separated) and Protobuf.

TradingSandbox module gives a good example to start in local, take a look in main_loop_hook implementation.

• MongoDB
• Protobuf