更改enroll命名,添加了注释,向get_error_msg中添加了一些错误代码

venv/Lib/site-packages/pip/_internal/pyproject.py

@@ -5,11 +5,7 @@ from typing import Any, List, Optional
 from pip._vendor import tomli
 from pip._vendor.packaging.requirements import InvalidRequirement, Requirement
 
-from pip._internal.exceptions import (
-    InstallationError,
-    InvalidPyProjectBuildRequires,
-    MissingPyProjectBuildRequires,
-)
+from pip._internal.exceptions import InstallationError
 
 
 def _is_list_of_str(obj: Any) -> bool:
@@ -60,7 +56,7 @@ def load_pyproject_toml(
 
     if has_pyproject:
         with open(pyproject_toml, encoding="utf-8") as f:
-            pp_toml = tomli.loads(f.read())
+            pp_toml = tomli.load(f)
         build_system = pp_toml.get("build-system")
     else:
         build_system = None
@@ -123,28 +119,47 @@ def load_pyproject_toml(
 
     # Ensure that the build-system section in pyproject.toml conforms
     # to PEP 518.
+    error_template = (
+        "{package} has a pyproject.toml file that does not comply "
+        "with PEP 518: {reason}"
+    )
 
     # Specifying the build-system table but not the requires key is invalid
     if "requires" not in build_system:
-        raise MissingPyProjectBuildRequires(package=req_name)
+        raise InstallationError(
+            error_template.format(
+                package=req_name,
+                reason=(
+                    "it has a 'build-system' table but not "
+                    "'build-system.requires' which is mandatory in the table"
+                ),
+            )
+        )
 
     # Error out if requires is not a list of strings
     requires = build_system["requires"]
     if not _is_list_of_str(requires):
-        raise InvalidPyProjectBuildRequires(
-            package=req_name,
-            reason="It is not a list of strings.",
+        raise InstallationError(
+            error_template.format(
+                package=req_name,
+                reason="'build-system.requires' is not a list of strings.",
+            )
         )
 
     # Each requirement must be valid as per PEP 508
     for requirement in requires:
         try:
             Requirement(requirement)
-        except InvalidRequirement as error:
-            raise InvalidPyProjectBuildRequires(
-                package=req_name,
-                reason=f"It contains an invalid requirement: {requirement!r}",
-            ) from error
+        except InvalidRequirement:
+            raise InstallationError(
+                error_template.format(
+                    package=req_name,
+                    reason=(
+                        "'build-system.requires' contains an invalid "
+                        "requirement: {!r}".format(requirement)
+                    ),
+                )
+            )
 
     backend = build_system.get("build-backend")
     backend_path = build_system.get("backend-path", [])