WIP installs without cmdstanpy however also does not fail when using …

…pseudobatch[error_propagation]

build_testing.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# remove the old virtual environment if it exists
+rm -rf .venv-docker
+
+# Create a new virtual environment
+python -m venv .venv-docker
+
+# Activate the virtual environment
+source .venv-docker/bin/activate
+
+# Install the current directory
+pip install -e '.[development]'
+
+# Run the tests
+pytest
+
+# install error_propagation
+pip install '.[error_propagation]'

pseudobatch/error_propagation/__init__.py

@@ -1,49 +1,57 @@
 import shutil
 import warnings
 from pathlib import Path
-import cmdstanpy
-from pseudobatch.error_propagation.error_propagation import (
-    run_error_propagation,
-)
-
-STAN_FILES_FOLDER = Path(__file__).parent / "stan"
-CMDSTAN_VERSION = "2.31.0"
-
-
-# on Windows specifically, we should point cmdstanpy to the repackaged
-# CmdStan if it exists. This lets cmdstanpy handle the TBB path for us.
-local_cmdstan = STAN_FILES_FOLDER / f"cmdstan-{CMDSTAN_VERSION}"
-if local_cmdstan.exists():
-    cmdstanpy.set_cmdstan_path(str(local_cmdstan.resolve()))
-
-
-def load_stan_model(name: str) -> cmdstanpy.CmdStanModel:
-    """
-    Try to load precompiled Stan models. If that fails,
-    compile them.
-    """
-    try:
-        model = cmdstanpy.CmdStanModel(
-            exe_file=STAN_FILES_FOLDER / f"{name}.exe",
-            stan_file=STAN_FILES_FOLDER / f"{name}.stan",
-            compile=False,
-        )
-    except ValueError:
-        warnings.warn(f"Failed to load pre-built model '{name}.exe', compiling")
-        model = cmdstanpy.CmdStanModel(
-            stan_file=STAN_FILES_FOLDER / f"{name}.stan",
-            stanc_options={"O1": True},
-        )
-        shutil.copy(
-            model.exe_file,  # type: ignore
-            STAN_FILES_FOLDER / f"{name}.exe",
-        )
-
-    return model
-
-
-ERROR_PROPAGATION = load_stan_model("error_propagation")
-
-
-# example: just print the info of the model
-print(ERROR_PROPAGATION.exe_info())
+from importlib.metadata import distribution
+
+try:
+    distribution("cmdstanpy")
+    import cmdstanpy
+
+    cmdstanpy_installed = True
+except:
+    cmdstanpy_installed = False
+
+if cmdstanpy_installed:
+    from pseudobatch.error_propagation.error_propagation import (
+        run_error_propagation,
+    )
+
+    STAN_FILES_FOLDER = Path(__file__).parent / "stan"
+    CMDSTAN_VERSION = "2.31.0"
+
+    # on Windows specifically, we should point cmdstanpy to the repackaged
+    # CmdStan if it exists. This lets cmdstanpy handle the TBB path for us.
+    local_cmdstan = STAN_FILES_FOLDER / f"cmdstan-{CMDSTAN_VERSION}"
+    if local_cmdstan.exists():
+        cmdstanpy.set_cmdstan_path(str(local_cmdstan.resolve()))
+
+    def load_stan_model(name: str) -> cmdstanpy.CmdStanModel:
+        """
+        Try to load precompiled Stan models. If that fails,
+        compile them.
+        """
+        try:
+            model = cmdstanpy.CmdStanModel(
+                exe_file=STAN_FILES_FOLDER / f"{name}.exe",
+                stan_file=STAN_FILES_FOLDER / f"{name}.stan",
+                compile=False,
+            )
+        except ValueError:
+            warnings.warn(
+                f"Failed to load pre-built model '{name}.exe', compiling"
+            )
+            model = cmdstanpy.CmdStanModel(
+                stan_file=STAN_FILES_FOLDER / f"{name}.stan",
+                stanc_options={"O1": True},
+            )
+            shutil.copy(
+                model.exe_file,  # type: ignore
+                STAN_FILES_FOLDER / f"{name}.exe",
+            )
+
+        return model
+
+    ERROR_PROPAGATION = load_stan_model("error_propagation")
+
+    # example: just print the info of the model
+    print(ERROR_PROPAGATION.exe_info())

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools", "wheel", "cmdstanpy>=1.0.7"]
+requires = ["setuptools", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [tool.isort]