From 6a9fa07c109620d3c2e2ed6e2dc8c04d0e86e6cd Mon Sep 17 00:00:00 2001
From: Valerij Talagayev <82884038+talagayev@users.noreply.github.com>
Date: Wed, 7 Aug 2024 00:48:02 +0200
Subject: [PATCH] Update base.py

---
 package/MDAnalysis/coordinates/base.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/package/MDAnalysis/coordinates/base.py b/package/MDAnalysis/coordinates/base.py
index d86704d5ac2..9a7f0942c8d 100644
--- a/package/MDAnalysis/coordinates/base.py
+++ b/package/MDAnalysis/coordinates/base.py
@@ -1663,7 +1663,15 @@ class SingleFrameReaderBase(ProtoReader):
     def __init__(self, filename, convert_units=True, n_atoms=None, **kwargs):
         super(SingleFrameReaderBase, self).__init__()
 
-        self.filename = filename
+        if isinstance(filename, NamedStream):
+            self.filename = filename
+        else:
+            if hasattr(filename, 'topology'):
+                self.filename = filename
+            else:
+                self.filename = str(filename)
+                if "MMTF" in self.filename:
+                    self.filename = filename
               
         self.convert_units = convert_units