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For example, I have proto-file File.proto:
enum Test { ONE = 1; TWO = 2; } I generate file File_pb2.py with protoc from File.proto. I want in a python-code get string "ONE" (that corresponds to the name of File_pb2.ONE) by value 1 (that corresponds to the value of File_pb2.ONE) from generated file File_pb2.py without defining my own dictionaries. How can I do that?
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Proto3 is the latest version of Protocol Buffers and includes the following changes from proto2: Field presence, also known as hasField , is removed by default for primitive fields. An unset primitive field has a language-defined default value.
For bool s, the default value is false. For numeric types, the default value is zero. For enums , the default value is the first value listed in the enum's type definition. This means care must be taken when adding a value to the beginning of an enum value list.
You can define enum s within a message definition, as in the above example, or outside – these enum s can be reused in any message definition in your .proto file. You can also use an enum type declared in one message as the type of a field in a different message, using the syntax _MessageType_._EnumType_ .
Assuming the generated python is located in File_pb2.py code Try this:
file_pb2._TEST.values_by_number[1].name In your case, this should give 'ONE'
The reverse is :
file_pb2._TEST.values_by_name['ONE'].number will give 1.
EDIT: As correctly pointed by @dyoo in the comments, a new method was later introduced in protobuf library:
file_pb2.Test.Name(1) file_pb2.Test.Value('One') EDIT: This has changed again in proto3. Now the Name() and Value() methods belong to the EnumTypeWrapper class so they can be accessed like:
file_pb2.Name(1) file_pb2.Value('One') If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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