Add sys.{executable,base_prefix,prefix} to features.pilinfo

Tests/test_features.py

@@ -129,9 +129,15 @@ def test_pilinfo() -> None:
     while lines[0].startswith("    "):
         lines = lines[1:]
     assert lines[0] == "-" * 68
-    assert lines[1].startswith("Python modules loaded from ")
-    assert lines[2].startswith("Binary modules loaded from ")
-    assert lines[3] == "-" * 68
+    assert lines[1].startswith("Python executable is")
+    lines = lines[2:]
+    if lines[0].startswith("Environment Python files loaded from"):
+        lines = lines[1:]
+    assert lines[0].startswith("System Python files loaded from")
+    assert lines[1] == "-" * 68
+    assert lines[2].startswith("Pillow Python modules loaded from ")
+    assert lines[3].startswith("Pillow binary modules loaded from ")
+    assert lines[4] == "-" * 68
     jpeg = (
         "\n"
         + "-" * 68

Tests/test_main.py

@@ -15,9 +15,15 @@ def test_main() -> None:
     while lines[0].startswith("    "):
         lines = lines[1:]
     assert lines[0] == "-" * 68
-    assert lines[1].startswith("Python modules loaded from ")
-    assert lines[2].startswith("Binary modules loaded from ")
-    assert lines[3] == "-" * 68
+    assert lines[1].startswith("Python executable is")
+    lines = lines[2:]
+    if lines[0].startswith("Environment Python files loaded from"):
+        lines = lines[1:]
+    assert lines[0].startswith("System Python files loaded from")
+    assert lines[1] == "-" * 68
+    assert lines[2].startswith("Pillow Python modules loaded from ")
+    assert lines[3].startswith("Pillow binary modules loaded from ")
+    assert lines[4] == "-" * 68
     jpeg = (
         os.linesep
         + "-" * 68

src/PIL/features.py

@@ -249,12 +249,17 @@ def pilinfo(out=None, supported_formats=True):
     for py_version in py_version[1:]:
         print(f"       {py_version.strip()}", file=out)
     print("-" * 68, file=out)
+    print(f"Python executable is {sys.executable or 'unknown'}", file=out)
+    if sys.prefix != sys.base_prefix:
+        print(f"Environment Python files loaded from {sys.prefix}", file=out)
+    print(f"System Python files loaded from {sys.base_prefix}", file=out)
+    print("-" * 68, file=out)
     print(
-        f"Python modules loaded from {os.path.dirname(Image.__file__)}",
+        f"Pillow Python modules loaded from {os.path.dirname(Image.__file__)}",
         file=out,
     )
     print(
-        f"Binary modules loaded from {os.path.dirname(Image.core.__file__)}",
+        f"Pillow binary modules loaded from {os.path.dirname(Image.core.__file__)}",
         file=out,
     )
     print("-" * 68, file=out)