fixup! PI: Don't load entire file into memory when passed file name

pypdf/_reader.py

@@ -314,6 +314,7 @@ def __init__(
 
         if isinstance(stream, (str, Path)):
             stream = open(stream, "rb")  #  noqa: SIM115
+            # Wish I could just close stream in __del__ but that fails a test very strangely
             weakref.finalize(self, stream.close)
 
         self.read(stream)

tests/test_writer.py

@@ -1211,6 +1211,9 @@ def test_set_page_label(pdf_file_path):
         ValueError, match="if given, start must be equal or greater than one"
     ):
         writer.set_page_label(0, 5, "/r", start=-1)
+    del writer
+    import gc
+    gc.collect()
 
     pdf_file_path.unlink()
 
@@ -1234,6 +1237,9 @@ def test_set_page_label(pdf_file_path):
     writer.set_page_label(0, 1, "/A")
     writer.write(pdf_file_path)
     assert PdfReader(pdf_file_path).page_labels[: len(expected)] == expected
+    import gc
+    gc.collect()
+    del reader
 
     pdf_file_path.unlink()
 
@@ -1477,6 +1483,7 @@ def test_update_form_fields(tmp_path):
     )
 
     writer.write(write_data_here)
+    del writer
     reader = PdfReader(write_data_here)
     flds = reader.get_fields()
     assert flds["CheckBox1"]["/V"] == "/Yes"
@@ -1498,6 +1505,9 @@ def test_update_form_fields(tmp_path):
     assert all(x in flds["CheckBox1"]["/_States_"] for x in ["/Off", "/Yes"])
     assert all(x in flds["RadioGroup1"]["/_States_"] for x in ["/1", "/2", "/3"])
     assert all(x in flds["Liste1"]["/_States_"] for x in ["Liste1", "Liste2", "Liste3"])
+    del reader, flds
+    import gc
+    gc.collect()
 
     Path(write_data_here).unlink()