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## Data transmission demo for using gRPC in Python
Four ways of data transmission when gRPC is used in Python. [Official Guide](<https://grpc.io/docs/guides/concepts/#unary-rpc>)
- #### unary-unary
In a single call, the client can only send request once, and the server can only respond once.
`client.py: simple_method`
`server.py: SimpleMethod`
- #### stream-unary
In a single call, the client can transfer data to the server an arbitrary number of times, but the server can only return a response once.
`client.py: client_streaming_method`
`server.py: ClientStreamingMethod`
- #### unary-stream
In a single call, the client can only transmit data to the server at one time, but the server can return the response many times.
`client.py: server_streaming_method`
`server.py: ServerStreamingMethod`
- #### stream-stream
In a single call, both client and server can send and receive data
to each other multiple times.
`client.py: bidirectional_streaming_method`
`server.py: BidirectionalStreamingMethod`
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