fix: put pyo3 behind feature flag for qcs crate (#560)

Author: gsmith-rigetti

crates/lib/Cargo.toml

@@ -16,6 +16,7 @@ tracing-config = ["tracing", "qcs-api-client-common/tracing-config", "qcs-api-cl
 libquil = ["dep:libquil-sys"]
 grpc-web = ["qcs-api-client-grpc/grpc-web"]
 tracing-opentelemetry = ["tracing-config", "qcs-api-client-grpc/tracing-opentelemetry", "qcs-api-client-openapi/tracing-opentelemetry"]
+python = ["dep:pyo3"]
 experimental = []
 
 [dependencies]
@@ -29,7 +30,7 @@ num = { version = "0.4.0", features = ["serde"] }
 opentelemetry = { workspace = true }
 opentelemetry_sdk = { workspace = true }
 pbjson-types = "0.7.0"
-pyo3 = { workspace = true }
+pyo3 = { workspace = true, optional = true }
 qcs-api-client-common.workspace = true
 qcs-api-client-openapi.workspace = true
 qcs-api-client-grpc.workspace = true

crates/lib/src/qpu/translation.rs

@@ -3,6 +3,7 @@
 
 use std::{collections::HashMap, time::Duration};
 
+#[cfg(feature = "python")]
 use pyo3::{exceptions::PyValueError, PyErr};
 use qcs_api_client_grpc::{
     models::controller::EncryptedControllerJob,
@@ -30,6 +31,7 @@ pub enum Error {
     ClientTimeout(#[from] Elapsed),
 }
 
+#[cfg(feature = "python")]
 impl From<Error> for PyErr {
     fn from(value: Error) -> Self {
         let message = value.to_string();

crates/python/Cargo.toml

@@ -22,7 +22,7 @@ crate-type = ["cdylib", "rlib"]
 async-trait = "0.1.73"
 futures-util = "0.3.24"
 # TODO #507: automatically update the version when publishing
-qcs = { version = "0.25", path = "../lib", features = ["tracing-opentelemetry", "experimental"] }
+qcs = { version = "0.25", path = "../lib", features = ["tracing-opentelemetry", "experimental", "python"] }
 qcs-api-client-common = { workspace = true, features = ["python"] }
 qcs-api-client-grpc.workspace = true
 qcs-api-client-openapi.workspace = true