Raise error in spacy package when model name is not a valid python identifier (#10192)

* MultiHashEmbed vector docs correction

* raise error for invalid identifier as model name

* more succinct error message

* update success message

* permitted package name + double underscore

* clarify package name error

* clarify underscore run message

* tweak language + simplify underscore run

* cleanup underscore run warning

* spacing correction

* Update spacy/tests/test_cli.py

Co-authored-by: Adriane Boyd <adrianeboyd@gmail.com>

spacy/cli/package.py

@@ -7,6 +7,7 @@ from collections import defaultdict
 from catalogue import RegistryError
 import srsly
 import sys
+import re
 
 from ._util import app, Arg, Opt, string_to_list, WHEEL_SUFFIX, SDIST_SUFFIX
 from ..schemas import validate, ModelMetaSchema
@@ -109,6 +110,24 @@ def package(
             ", ".join(meta["requirements"]),
         )
     if name is not None:
+        if not name.isidentifier():
+            msg.fail(
+                f"Model name ('{name}') is not a valid module name. "
+                "This is required so it can be imported as a module.",
+                "We recommend names that use ASCII A-Z, a-z, _ (underscore), "
+                "and 0-9. "
+                "For specific details see: https://docs.python.org/3/reference/lexical_analysis.html#identifiers",
+                exits=1,
+            )
+        if not _is_permitted_package_name(name):
+            msg.fail(
+                f"Model name ('{name}') is not a permitted package name. "
+                "This is required to correctly load the model with spacy.load.",
+                "We recommend names that use ASCII A-Z, a-z, _ (underscore), "
+                "and 0-9. "
+                "For specific details see: https://www.python.org/dev/peps/pep-0426/#name",
+                exits=1,
+            )
         meta["name"] = name
     if version is not None:
         meta["version"] = version
@@ -162,7 +181,7 @@ def package(
         imports="\n".join(f"from . import {m}" for m in imports)
     )
     create_file(package_path / "__init__.py", init_py)
-    msg.good(f"Successfully created package '{model_name_v}'", main_path)
+    msg.good(f"Successfully created package directory '{model_name_v}'", main_path)
     if create_sdist:
         with util.working_dir(main_path):
             util.run_command([sys.executable, "setup.py", "sdist"], capture=False)
@@ -171,8 +190,14 @@ def package(
     if create_wheel:
         with util.working_dir(main_path):
             util.run_command([sys.executable, "setup.py", "bdist_wheel"], capture=False)
-        wheel = main_path / "dist" / f"{model_name_v}{WHEEL_SUFFIX}"
+        wheel_name_squashed = re.sub("_+", "_", model_name_v)
+        wheel = main_path / "dist" / f"{wheel_name_squashed}{WHEEL_SUFFIX}"
         msg.good(f"Successfully created binary wheel", wheel)
+    if "__" in model_name:
+        msg.warn(
+            f"Model name ('{model_name}') contains a run of underscores. "
+            "Runs of underscores are not significant in installed package names.",
+        )
 
 
 def has_wheel() -> bool:
@@ -422,6 +447,14 @@ def _format_label_scheme(data: Dict[str, Any]) -> str:
     return md.text
 
 
+def _is_permitted_package_name(package_name: str) -> bool:
+    # regex from: https://www.python.org/dev/peps/pep-0426/#name
+    permitted_match = re.search(
+        r"^([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])$", package_name, re.IGNORECASE
+    )
+    return permitted_match is not None
+
+
 TEMPLATE_SETUP = """
 #!/usr/bin/env python
 import io

spacy/tests/test_cli.py

@@ -17,6 +17,7 @@ from spacy.cli.debug_data import _get_labels_from_spancat
 from spacy.cli.download import get_compatibility, get_version
 from spacy.cli.init_config import RECOMMENDATIONS, init_config, fill_config
 from spacy.cli.package import get_third_party_dependencies
+from spacy.cli.package import _is_permitted_package_name
 from spacy.cli.validate import get_model_pkgs
 from spacy.lang.en import English
 from spacy.lang.nl import Dutch
@@ -695,6 +696,17 @@ def test_get_labels_from_model(factory_name, pipe_name):
         assert _get_labels_from_model(nlp, factory_name) == set(labels)
 
 
+def test_permitted_package_names():
+    # https://www.python.org/dev/peps/pep-0426/#name
+    assert _is_permitted_package_name("Meine_Bäume") == False
+    assert _is_permitted_package_name("_package") == False
+    assert _is_permitted_package_name("package_") == False
+    assert _is_permitted_package_name(".package") == False
+    assert _is_permitted_package_name("package.") == False
+    assert _is_permitted_package_name("-package") == False
+    assert _is_permitted_package_name("package-") == False
+
+    
 def test_debug_data_compile_gold():
     nlp = English()
     pred = Doc(nlp.vocab, words=["Token", ".", "New", "York", "City"])
@@ -707,4 +719,4 @@ def test_debug_data_compile_gold():
     ref = Doc(nlp.vocab, words=["Token", ".", "New York City"], sent_starts=[True, False, True], ents=["O", "B-ENT", "I-ENT"])
     eg = Example(pred, ref)
     data = _compile_gold([eg], ["ner"], nlp, True)
-    assert data["boundary_cross_ents"] == 1
+    assert data["boundary_cross_ents"] == 1