Fix TypeError when conda 26.x returns dict from fetch_latest() (#1196)

gabrielbusta · marcoesters · web-flow · commit 5739e0b2d6e6 · 2026-04-07T06:50:53.000-07:00
* Fix TypeError when conda 26.x returns dict from fetch_latest() In conda 26.x, `subdir_data.repo_fetch.fetch_latest()` returns an already-parsed dict instead of a JSON string. Add a type check to handle both cases, maintaining backward compatibility with older conda versions. * chore: add news file * Apply suggestion from @marcoesters Co-authored-by: Marco Esters <mesters@anaconda.com> --------- Co-authored-by: Marco Esters <mesters@anaconda.com>
diff --git a/constructor/conda_interface.py b/constructor/conda_interface.py
@@ -130,6 +130,9 @@ def get_repodata(url):
                 "packages.conda": {},
                 "removed": [],
             }
+        elif isinstance(raw_repodata_str, dict):
+            # conda 26.x+ may return an already-parsed dict from fetch_latest()
+            full_repodata = raw_repodata_str
         else:
             full_repodata = json.loads(raw_repodata_str)
 
diff --git a/news/1196-conda-26-fetch-latest-dict b/news/1196-conda-26-fetch-latest-dict
@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Fix TypeError when conda 26.x returns dict from `fetch_latest()`. (#1196)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>

Original file line number	Diff line number	Diff line change
`@@ -130,6 +130,9 @@ def get_repodata(url):`
`130`	`130`	`"packages.conda": {},`
`131`	`131`	`"removed": [],`
`132`	`132`	`}`
	`133`	`+ elif isinstance(raw_repodata_str, dict):`
	`134`	`+ # conda 26.x+ may return an already-parsed dict from fetch_latest()`
	`135`	`+ full_repodata = raw_repodata_str`
`133`	`136`	`else:`
`134`	`137`	`full_repodata = json.loads(raw_repodata_str)`
`135`	`138`