add assert in XPort get

include/xspcomm/xport.h

@@ -26,6 +26,7 @@ public:
     XPort &NewSubPort(std::string subprefix);
     XPort &SelectPins(std::vector<std::string> pins);
     XPort &SelectPins(std::initializer_list<std::string> pins);
+    bool Has(std::string key, bool raw_key = false);
     xspcomm::XData &Get(std::string key, bool raw_key = false);
     XPort &FlipIOType();
     XPort &AsBiIO();

src/xport.cpp

@@ -95,6 +95,11 @@ xspcomm::XData &XPort::operator[](std::string key)
     return this->Get(key);
 }
 
+bool XPort::Has(std::string key, bool raw_key)
+{
+    return this->port_list.count(raw_key ? key : this->asKey(key)) > 0;
+}
+
 xspcomm::XData &XPort::Get(std::string key, bool raw_key)
 {
     Assert(this->port_list.count(raw_key ? key : this->asKey(key)) > 0,

swig/python/xcomm.py

@@ -138,6 +138,8 @@ def XPort__str__(self: XPort):
     return f"XPort(prefix={self.prefix}, size={self.PortCount()})"
 
 def XPort__getitem__(self: XPort, key):
+    assert isinstance(key, str), f"Pin key ({key}) must be str"
+    assert self.Has(key), f"Pin '{key}' not found in XPort"
     return self.Get(key)
 
 def XPort__setitem__(self: XPort, key, value):