[BUG] python use python -m grpc_tools.proto gen code get ModuleNotFoundError: No module named 'buf'

[dobet]

Description

one proto file gen go and python code. go run success, but python run get
ModuleNotFoundError: No module named 'buf'

Steps to Reproduce

1. First step to reproduce the bug
   proto

syntax = "proto3";
  
package my.package;

import "google/protobuf/timestamp.proto";
import "buf/validate/validate.proto";

message Transaction {
  uint64 id = 1 [(buf.validate.field).uint64.gt = 999];
  google.protobuf.Timestamp purchase_date = 2;
  google.protobuf.Timestamp delivery_date = 3;

  string price = 4 [(buf.validate.field).cel = {
    id: "transaction.price",
    message: "price must be positive and include a valid currency symbol ($ or £)",
    expression: "(this.startswith('$') or this.startswith('£')) and float(this[1:]) > 0"
  }];

  option (buf.validate.message).cel = {
    id: "transaction.delivery_date",
    message: "delivery date must be after purchase date",
    expression: "this.delivery_date > this.purchase_date"
  };
}

3. Second step to reproduce the bug

go use protoc to gen code and run sucess.

python use

python3 -m grpc_tools.protoc 

to gen code and run falied

5. Third step to reproduce the bug
   ... additional steps as needed

Expected Behavior

python run success.

Actual Behavior

ModuleNotFoundError: No module named 'buf'

Screenshots/Logs

Environment

• Operating System:
• Version:
• Compiler/Toolchain:
• Protobuf Compiler & Version:
• Protoc-gen-validate Version:
• Protovalidate Version:

Possible Solution

Additional Context

[rodaine]

Hi @dobet! I'm going to move this over to the protovalidate-python project. Can you share your buf.yaml and buf.gen.yaml you used (or protoc command you ran)?

[emcfarlane]

Closing as a duplicate of #146 . Please see the fix in that thread.

[emcfarlane]

@dobet you will need to compile the proto source files with protoc. The source files are contained within this repo: https://github.com/bufbuild/protovalidate/tree/main/proto . Once downloaded you can use protoc to generated the python files:

python3 -m grpc_tools.protoc \
  -I . \
  -I path/to/validate/ \
  --python_out=":./gen" 

Ensure the runtime matches the intended python version.