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/setuptools/build_meta.py

@@ -37,9 +37,8 @@ import warnings
 
 import setuptools
 import distutils
-from ._reqs import parse_strings
-from .extern.more_itertools import always_iterable
 
+from pkg_resources import parse_requirements
 
 __all__ = ['get_requires_for_build_sdist',
            'get_requires_for_build_wheel',
@@ -57,7 +56,7 @@ class SetupRequirementsError(BaseException):
 
 class Distribution(setuptools.dist.Distribution):
     def fetch_build_eggs(self, specifiers):
-        specifier_list = list(parse_strings(specifiers))
+        specifier_list = list(map(str, parse_requirements(specifiers)))
 
         raise SetupRequirementsError(specifier_list)
 
@@ -127,26 +126,11 @@ def suppress_known_deprecation():
         yield
 
 
-class _BuildMetaBackend:
+class _BuildMetaBackend(object):
 
-    @staticmethod
-    def _fix_config(config_settings):
-        """
-        Ensure config settings meet certain expectations.
-
-        >>> fc = _BuildMetaBackend._fix_config
-        >>> fc(None)
-        {'--global-option': []}
-        >>> fc({})
-        {'--global-option': []}
-        >>> fc({'--global-option': 'foo'})
-        {'--global-option': ['foo']}
-        >>> fc({'--global-option': ['foo']})
-        {'--global-option': ['foo']}
-        """
+    def _fix_config(self, config_settings):
         config_settings = config_settings or {}
-        config_settings['--global-option'] = list(always_iterable(
-            config_settings.get('--global-option')))
+        config_settings.setdefault('--global-option', [])
         return config_settings
 
     def _get_build_requires(self, config_settings, requirements):
@@ -174,10 +158,12 @@ class _BuildMetaBackend:
         exec(compile(code, __file__, 'exec'), locals())
 
     def get_requires_for_build_wheel(self, config_settings=None):
+        config_settings = self._fix_config(config_settings)
         return self._get_build_requires(
             config_settings, requirements=['wheel'])
 
     def get_requires_for_build_sdist(self, config_settings=None):
+        config_settings = self._fix_config(config_settings)
         return self._get_build_requires(config_settings, requirements=[])
 
     def prepare_metadata_for_build_wheel(self, metadata_directory,