Move errors to a separate file.

micropip/errors.py

@@ -0,0 +1,24 @@
+"""
+A module to define micropip custom Exceptions.
+"""
+
+
+class UnsupportedContentTypeError(Exception):
+    """raise when selecting a parser for current index
+
+    This is raise if the current content type is not recognized.
+    """
+
+
+class NoCompatibleWheelError(Exception):
+    """
+    This is raised when a package is found but have no wheel compatible with
+    current pyodide.
+    """
+
+
+class PackageNotFoundOnAnyIndexError(Exception):
+    """
+    This is raised if current package was not found on any of the currently
+    listed index.
+    """

micropip/package_index.py

@@ -13,6 +13,7 @@
 
 from ._compat import HttpStatusError, fetch_string_and_headers
 from ._utils import is_package_compatible, parse_version
+from .errors import PackageNotFoundOnAnyIndexError, UnsupportedContentTypeError
 from .externals.mousebender.simple import from_project_details_html
 from .wheelinfo import WheelInfo
 
@@ -218,10 +219,6 @@ def _contain_placeholder(url: str, placeholder: str = "package_name") -> bool:
     return placeholder in fields
 
 
-class UnsupportedContentTypeError(Exception):
-    pass
-
-
 def _select_parser(content_type: str, pkgname: str) -> Callable[[str], ProjectInfo]:
     """
     Select the function to parse the response based on the content type.
@@ -243,10 +240,6 @@ def _select_parser(content_type: str, pkgname: str) -> Callable[[str], ProjectIn
             )
 
 
-class NoValidIndexForPackageError(Exception):
-    pass
-
-
 async def query_package(
     name: str,
     fetch_kwargs: dict[str, Any] | None = None,
@@ -309,7 +302,7 @@ async def query_package(
         parser = _select_parser(content_type, name)
         return parser(metadata)
     else:
-        raise NoValidIndexForPackageError(
+        raise PackageNotFoundOnAnyIndexError(
             f"Can't fetch metadata for {name!r}. "
             "Please make sure you have entered a correct package name "
             "and correctly specified index_urls (if you changed them)."

micropip/transaction.py

@@ -13,8 +13,9 @@
 from ._compat import REPODATA_PACKAGES
 from ._utils import best_compatible_tag_index, check_compatible
 from .constants import FAQ_URLS
+from .errors import NoCompatibleWheelError
 from .package import PackageMetadata
-from .package_index import NoValidIndexForPackageError, ProjectInfo
+from .package_index import PackageNotFoundOnAnyIndexError, ProjectInfo
 from .wheelinfo import WheelInfo
 
 logger = logging.getLogger("micropip")
@@ -153,7 +154,7 @@ def eval_marker(e: dict[str, str]) -> bool:
             else:
                 try:
                     await self._add_requirement_from_package_index(req)
-                except NoValidIndexForPackageError:
+                except PackageNotFoundOnAnyIndexError:
                     logger.warning(
                         "Transaction: package %r was not found in any index, "
                         "falling back to pyodide lock file",
@@ -178,7 +179,7 @@ def eval_marker(e: dict[str, str]) -> bool:
                         )
 
                         raise
-        except (NoCompatibleWheelError, NoValidIndexForPackageError):
+        except (NoCompatibleWheelError, PackageNotFoundOnAnyIndexError):
             self.failed.append(req)
             if not self.keep_going:
                 raise
@@ -263,10 +264,6 @@ async def add_wheel(
         self.wheels.append(wheel)
 
 
-class NoCompatibleWheelError(Exception):
-    pass
-
-
 def find_wheel(metadata: ProjectInfo, req: Requirement) -> WheelInfo:
     """Parse metadata to find the latest version of pure python wheel.
     Parameters