diff --git a/common/pybindings.cc b/common/pybindings.cc
index 02928e36..6cae889d 100644
--- a/common/pybindings.cc
+++ b/common/pybindings.cc
@@ -154,12 +154,19 @@ BOOST_PYTHON_MODULE(MODULE_NAME)
     readwrite_wrapper<PortRef &, decltype(&PortRef::budget), &PortRef::budget, pass_through<delay_t>,
                       pass_through<delay_t>>::def_wrap(pr_cls, "budget");
 
+    auto pm_cls = class_<ContextualWrapper<PipMap &>>("PipMap", no_init);
+    readwrite_wrapper<PipMap &, decltype(&PipMap::pip), &PipMap::pip, conv_to_str<PipId>,
+                      conv_from_str<PipId>>::def_wrap(pm_cls, "pip");
+    readwrite_wrapper<PipMap &, decltype(&PipMap::strength), &PipMap::strength, pass_through<PlaceStrength>,
+                      pass_through<PlaceStrength>>::def_wrap(pm_cls, "strength");
+
     def("parse_json", parse_json_shim);
     def("load_design", load_design_shim, return_value_policy<manage_new_object>());
 
     WRAP_MAP(AttrMap, pass_through<std::string>, "AttrMap");
     WRAP_MAP(PortMap, wrap_context<PortInfo &>, "PortMap");
     WRAP_MAP(PinMap, conv_to_str<IdString>, "PinMap");
+    WRAP_MAP(WireMap, wrap_context<PipMap &>, "WireMap");
 
     WRAP_VECTOR(PortRefVector, wrap_context<PortRef &>);
 
diff --git a/ecp5/arch_pybindings.h b/ecp5/arch_pybindings.h
index f18b5ff1..9bd7bcdf 100644
--- a/ecp5/arch_pybindings.h
+++ b/ecp5/arch_pybindings.h
@@ -44,14 +44,36 @@ template <> struct string_converter<WireId>
 {
     WireId from_str(Context *ctx, std::string name) { return ctx->getWireByName(ctx->id(name)); }
 
-    std::string to_str(Context *ctx, WireId id) { return ctx->getWireName(id).str(ctx); }
+    std::string to_str(Context *ctx, WireId id)
+    {
+        if (id == WireId())
+            throw bad_wrap();
+        return ctx->getWireName(id).str(ctx);
+    }
+};
+
+template <> struct string_converter<const WireId>
+{
+    WireId from_str(Context *ctx, std::string name) { return ctx->getWireByName(ctx->id(name)); }
+
+    std::string to_str(Context *ctx, WireId id)
+    {
+        if (id == WireId())
+            throw bad_wrap();
+        return ctx->getWireName(id).str(ctx);
+    }
 };
 
 template <> struct string_converter<PipId>
 {
     PipId from_str(Context *ctx, std::string name) { return ctx->getPipByName(ctx->id(name)); }
 
-    std::string to_str(Context *ctx, PipId id) { return ctx->getPipName(id).str(ctx); }
+    std::string to_str(Context *ctx, PipId id)
+    {
+        if (id == PipId())
+            throw bad_wrap();
+        return ctx->getPipName(id).str(ctx);
+    }
 };
 
 } // namespace PythonConversion
diff --git a/ice40/arch_pybindings.h b/ice40/arch_pybindings.h
index 070c2396..eaf3ac97 100644
--- a/ice40/arch_pybindings.h
+++ b/ice40/arch_pybindings.h
@@ -45,14 +45,36 @@ template <> struct string_converter<WireId>
 {
     WireId from_str(Context *ctx, std::string name) { return ctx->getWireByName(ctx->id(name)); }
 
-    std::string to_str(Context *ctx, WireId id) { return ctx->getWireName(id).str(ctx); }
+    std::string to_str(Context *ctx, WireId id)
+    {
+        if (id == WireId())
+            throw bad_wrap();
+        return ctx->getWireName(id).str(ctx);
+    }
+};
+
+template <> struct string_converter<const WireId>
+{
+    WireId from_str(Context *ctx, std::string name) { return ctx->getWireByName(ctx->id(name)); }
+
+    std::string to_str(Context *ctx, WireId id)
+    {
+        if (id == WireId())
+            throw bad_wrap();
+        return ctx->getWireName(id).str(ctx);
+    }
 };
 
 template <> struct string_converter<PipId>
 {
     PipId from_str(Context *ctx, std::string name) { return ctx->getPipByName(ctx->id(name)); }
 
-    std::string to_str(Context *ctx, PipId id) { return ctx->getPipName(id).str(ctx); }
+    std::string to_str(Context *ctx, PipId id)
+    {
+        if (id == PipId())
+            throw bad_wrap();
+        return ctx->getPipName(id).str(ctx);
+    }
 };
 
 } // namespace PythonConversion