update highs and jsquery

Author: miguelhisojo

docs/python-mip_theme/static/lib/jquery/jquery.min.js

@@ -30,16 +30,21 @@
         # need library matching operating system
         platform = sys.platform.lower()
         if "linux" in platform:
-            pattern = "highs_bindings.*.so"
+            patterns = ["highs_bindings.*.so", "_core.*.so"]
         elif platform.startswith("win"):
-            pattern = "highs_bindings.*.pyd"
+            patterns = ["highs_bindings.*.pyd", "_core.*.pyd"]
         elif any(platform.startswith(p) for p in ("darwin", "macos")):
-            pattern = "highs_bindings.*.so"
+            patterns = ["highs_bindings.*.so", "_core.*.so"]
         else:
             raise NotImplementedError(f"{sys.platform} not supported!")
 
         # there should only be one match
-        [libfile] = glob.glob(os.path.join(pkg_path, pattern))
+        matched_files = []
+        for pattern in patterns:
+            matched_files.extend(glob.glob(os.path.join(pkg_path, pattern)))
+        if len(matched_files) != 1:
+            raise FileNotFoundError(f"Could not find HiGHS library in {pkg_path}.")
+        [libfile] = matched_files
         logger.debug("Choosing HiGHS library {libfile} via highspy package.")
 
     highslib = ffi.dlopen(libfile)

mip/highs.py

@@ -49,6 +49,8 @@ def add(
         return new_var
 
     def __getitem__(self: "VarList", key):
+        if key is None:
+            raise KeyError("Empty key access (e.g., varlist[]) is not allowed in Python 3.13")
         if isinstance(key, str):
             return self.__model.var_by_name(key)
         return self.__vars[key]

mip/lists.py

@@ -471,7 +471,7 @@ def constr_by_name(self: "Model", name: str) -> Optional["mip.Constr"]:
             constraint or None if not found
         """
         cidx = self.solver.constr_get_index(name)
-        if cidx < 0 or cidx > len(self.constrs):
+        if cidx < 0 or cidx >= len(self.constrs):
             return None
         return self.constrs[cidx]
 
@@ -484,7 +484,7 @@ def var_by_name(self: "Model", name: str) -> Optional["mip.Var"]:
             Variable or None if not found
         """
         v = self.solver.var_get_index(name)
-        if v < 0 or v > len(self.vars):
+        if v < 0 or v >= len(self.vars):
             return None
         return self.vars[v]