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