Add permissive flag and update PythonUpdateProvider

src/python_inspector/api.py

@@ -82,6 +82,7 @@ def resolve_dependencies(
     analyze_setup_py_insecurely=False,
     prefer_source=False,
     printer=print,
+    ignore_errors=False,
 ):
     """
     Resolve the dependencies for the package requirements listed in one or
@@ -268,6 +269,7 @@ def resolve_dependencies(
         max_rounds=max_rounds,
         pdt_output=pdt_output,
         analyze_setup_py_insecurely=analyze_setup_py_insecurely,
+        ignore_errors=ignore_errors,
     )
 
     packages = []
@@ -302,6 +304,7 @@ def resolve(
     max_rounds=200000,
     pdt_output=False,
     analyze_setup_py_insecurely=False,
+    ignore_errors=False,
 ):
     """
     Resolve dependencies given a ``direct_dependencies`` list of
@@ -327,6 +330,7 @@ def resolve(
         max_rounds=max_rounds,
         pdt_output=pdt_output,
         analyze_setup_py_insecurely=analyze_setup_py_insecurely,
+        ignore_errors=ignore_errors,
     )
 
     return resolved_dependencies, packages
@@ -340,6 +344,7 @@ def get_resolved_dependencies(
     max_rounds: int = 200000,
     pdt_output: bool = False,
     analyze_setup_py_insecurely: bool = False,
+    ignore_errors: bool = False,
 ):
     """
     Return resolved dependencies of a ``requirements`` list of Requirement for
@@ -354,6 +359,7 @@ def get_resolved_dependencies(
             environment=environment,
             repos=repos,
             analyze_setup_py_insecurely=analyze_setup_py_insecurely,
+            ignore_errors=ignore_errors,
         ),
         reporter=BaseReporter(),
     )

src/python_inspector/resolution.py

@@ -352,7 +352,8 @@ def get_requirements_from_python_manifest(
 
 class PythonInputProvider(AbstractProvider):
     def __init__(
-        self, environment=DEFAULT_ENVIRONMENT, repos=tuple(), analyze_setup_py_insecurely=False
+        self, environment=DEFAULT_ENVIRONMENT, repos=tuple(), analyze_setup_py_insecurely=True,
+        ignore_errors=False
     ):
         self.environment = environment
         self.environment_marker = get_environment_marker_from_environment(self.environment)
@@ -361,6 +362,7 @@ def __init__(
         self.dependencies_by_purl = {}
         self.wheel_or_sdist_by_package = {}
         self.analyze_setup_py_insecurely = analyze_setup_py_insecurely
+        self.ignore_errors = ignore_errors
 
     def identify(self, requirement_or_candidate: Union[Candidate, Requirement]) -> str:
         """Given a requirement, return an identifier for it. Overridden."""
@@ -583,8 +585,11 @@ def _iter_matches(
                 versions.extend(self.get_versions_for_package(name=name, repo=repo))
 
         if not versions:
-            raise NoVersionsFound(f"This package does not exist: {name}")
-
+            if self.ignore_errors:
+                yield from [Candidate("NonExistant", "0.0.0", "")]
+                return
+            else:
+                raise NoVersionsFound(f"This package does not exist: {name}")
         yield from self.get_candidates(
             all_versions=versions,
             requirements=requirements,

src/python_inspector/resolve_cli.py

@@ -172,6 +172,7 @@ def print_version(ctx, param, value):
     callback=print_version,
     help="Show the version and exit.",
 )
+@click.option('--ignore-errors', is_flag=True, default=False, help='Ignore errors and continue execution.')
 @click.help_option("-h", "--help")
 def resolve_dependencies(
     ctx,
@@ -190,6 +191,7 @@ def resolve_dependencies(
     analyze_setup_py_insecurely=False,
     prefer_source=False,
     verbose=TRACE,
+    ignore_errors=False,
 ):
     """
     Resolve the dependencies for the package requirements listed in one or
@@ -260,6 +262,7 @@ def resolve_dependencies(
             analyze_setup_py_insecurely=analyze_setup_py_insecurely,
             printer=click.secho,
             prefer_source=prefer_source,
+            ignore_errors=ignore_errors,
         )
         output = dict(
             headers=headers,