jpylyzer 0 -> 1
attrpath: jpylyzer
Checking auto update branch...
[version] 
[version] generic version rewriter does not support multiple hashes
[rustCrateVersion] 
[rustCrateVersion] No cargoSha256 or cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorSha256 or vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/75klz42dd7ywfzrkznw871aly5c0fgkv-packages.json.drv
building '/nix/store/75klz42dd7ywfzrkznw871aly5c0fgkv-packages.json.drv'...

Going to be running update for following packages:
 - jpylyzer-2.1.0

Press Enter key to continue...
Running update for:
 - jpylyzer-2.1.0: UPDATING ...
 - jpylyzer-2.1.0: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/development/python-modules/jpylyzer/default.nix b/pkgs/development/python-modules/jpylyzer/default.nix
index 9a33ecf46d4b..a4eda4cc0665 100644
--- a/pkgs/development/python-modules/jpylyzer/default.nix
+++ b/pkgs/development/python-modules/jpylyzer/default.nix
@@ -18,20 +18,20 @@ let
   testFiles = fetchFromGitHub {
     owner = "openpreserve";
     repo = "jpylyzer-test-files";
-    rev = "146cb0029b5ea9d8ef22dc6683cec8afae1cc63a";
+    rev = "refs/tags/${version}";
     hash = "sha256-uKUau7mYXqGs4dSnXGPnPsH9k81ZCK0aPj5F9HWBMZ8=";
   };
 
 in buildPythonPackage rec {
   pname = "jpylyzer";
-  version = "2.1.0";
+  version = "2.2.0";
   format = "setuptools";
 
   src = fetchFromGitHub {
     owner = "openpreserve";
     repo = pname;
     rev = version;
-    hash = "sha256-LBVOwjWC/HEvGgoi8WxEdl33M4JrfdHEj1Dk7f1NAiA=";
+    hash = "sha256-SK6Z+JkFBD9V99reRZf+jM8Z2SiDNSG72gusp2FPfmI=";
   };
 
   propagatedBuildInputs = [ six ];

The derivation has no 'version' attribute, so do not know how to figure out the version while doing an updateScript update