feat: add try block around version check

Author: vchudnov-g

gapic/templates/%namespace/%name_%version/%sub/__init__.py.j2

@@ -21,71 +21,77 @@ else:   # pragma: NO COVER
     In the meantime, please ensure the functionality here mirrors the
     equivalent functionality in api_core, in those two functions above.
 #}
-    # An older version of api_core is installed, which does not define the
+    # An older version of api_core is installed which does not define the
     # functions above. We do equivalent checks manually.
-
-    import warnings
-    import sys
-
-    _py_version_str = sys.version.split()[0]
-    _package_label = "{{package_path}}"
-    if sys.version_info < (3, 9):
-        warnings.warn("You are using a non-supported Python version " +
-                      f"({_py_version_str}).  Google will not post any further " +
-                      f"updates to {_package_label} supporting this Python version. " +
-                      "Please upgrade to the latest Python version, or at " +
-                      f"least to Python 3.9, and then update {_package_label}.",
-                      FutureWarning)
-    if sys.version_info[:2] == (3, 9):
-        warnings.warn(f"You are using a Python version ({_py_version_str}) " +
-                      f"which Google will stop supporting in {_package_label} when " +
-                      "it reaches its end of life (October 2025). Please " +
-                      "upgrade to the latest Python version, or at " +
-                      "least Python 3.10, before then, and " +
-                      f"then update {_package_label}.",
-                      FutureWarning)
-
-    from packaging.version import parse as parse_version
-
-    if sys.version_info < (3, 8):
-        import pkg_resources
-
-        def _get_version(dependency_name):
-          try:
-            version_string = pkg_resources.get_distribution(dependency_name).version
-            return (parse_version(version_string), version_string)
-          except pkg_resources.DistributionNotFound:
-            return (None, "--")
-    else:
-        from importlib import metadata
-
-        def _get_version(dependency_name):
-            try:
-                version_string = metadata.version("requests")
-                parsed_version = parse_version(version_string)
-                return (parsed_version.release, version_string)
-            except metadata.PackageNotFoundError:
+    try:
+        import warnings
+        import sys
+
+        _py_version_str = sys.version.split()[0]
+        _package_label = "{{package_path}}"
+        if sys.version_info < (3, 9):
+            warnings.warn("You are using a non-supported Python version " +
+                          f"({_py_version_str}).  Google will not post any further " +
+                          f"updates to {_package_label} supporting this Python version. " +
+                          "Please upgrade to the latest Python version, or at " +
+                          f"least to Python 3.9, and then update {_package_label}.",
+                          FutureWarning)
+        if sys.version_info[:2] == (3, 9):
+            warnings.warn(f"You are using a Python version ({_py_version_str}) " +
+                          f"which Google will stop supporting in {_package_label} in " +
+                          "January 2026. Please " +
+                          "upgrade to the latest Python version, or at " +
+                          "least to Python 3.10, before then, and " +
+                          f"then update {_package_label}.",
+                          FutureWarning)
+
+        from packaging.version import parse as parse_version
+
+        if sys.version_info < (3, 8):
+            import pkg_resources
+
+            def _get_version(dependency_name):
+              try:
+                version_string = pkg_resources.get_distribution(dependency_name).version
+                return (parse_version(version_string), version_string)
+              except pkg_resources.DistributionNotFound:
                 return (None, "--")
-
-    _dependency_package = "google.protobuf"
-    _next_supported_version = "4.25.8"
-    _next_supported_version_tuple = (4, 25, 8)
-    _recommendation = " (we recommend 6.x)"
-    (_version_used, _version_used_string) = _get_version(_dependency_package)
-    if _version_used and _version_used < _next_supported_version_tuple:
-        warnings.warn(f"Package {_package_label} depends on " +
-                      f"{_dependency_package}, currently installed at version " +
-                      f"{_version_used_string}. Future updates to " +
-                      f"{_package_label} will require {_dependency_package} at " +
-                      f"version {_next_supported_version} or higher{_recommendation}." +
-                      " Please ensure " +
-                      "that either (a) your Python environment doesn't pin the " +
-                      f"version of {_dependency_package}, so that updates to " +
-                      f"{_package_label} can require the higher version, or " +
-                      "(b) you manually update your Python environment to use at " +
-                      f"least version {_next_supported_version} of " +
-                      f"{_dependency_package}.",
-                      FutureWarning)
+        else:
+            from importlib import metadata
+
+            def _get_version(dependency_name):
+                try:
+                    version_string = metadata.version("requests")
+                    parsed_version = parse_version(version_string)
+                    return (parsed_version.release, version_string)
+                except metadata.PackageNotFoundError:
+                    return (None, "--")
+
+        _dependency_package = "google.protobuf"
+        _next_supported_version = "4.25.8"
+        _next_supported_version_tuple = (4, 25, 8)
+        _recommendation = " (we recommend 6.x)"
+        (_version_used, _version_used_string) = _get_version(_dependency_package)
+        if _version_used and _version_used < _next_supported_version_tuple:
+            warnings.warn(f"Package {_package_label} depends on " +
+                          f"{_dependency_package}, currently installed at version " +
+                          f"{_version_used_string}. Future updates to " +
+                          f"{_package_label} will require {_dependency_package} at " +
+                          f"version {_next_supported_version} or higher{_recommendation}." +
+                          " Please ensure " +
+                          "that either (a) your Python environment doesn't pin the " +
+                          f"version of {_dependency_package}, so that updates to " +
+                          f"{_package_label} can require the higher version, or " +
+                          "(b) you manually update your Python environment to use at " +
+                          f"least version {_next_supported_version} of " +
+                          f"{_dependency_package}.",
+                          FutureWarning)
+    except Exception:
+            warnings.warn("Could not determine the version of Python " +
+                          "currently being used. To continue receiving " +
+                          "updates for {_package_label}, ensure you are " +
+                          "using a supported version of Python; see " +
+                          "https://devguide.python.org/versions/")
 
 {#  Import subpackages. -#}
 {% for subpackage, _ in api.subpackages|dictsort %}