| ## Data transmission demo for using gRPC in Python |
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| Four ways of data transmission when gRPC is used in Python. [Official 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 |
| 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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