Improve exception

Author: seisman

pygmt/exceptions.py

@@ -156,22 +156,28 @@ def __init__(
         exclusive: Set[str] | None = None,
         reason: str | None = None,
     ):
-        msg = ""
+        msg = []
         if required:
-            msg = (
-                "Required parameter(s) are missing: "
-                f"{', '.join(repr(par) for par in required)}."
-            )
+            msg.append[
+                (
+                    "Required parameter(s) are missing: "
+                    f"{', '.join(repr(par) for par in required)}."
+                )
+            ]
         if require_any:
-            msg = (
-                "At least one of the following parameters must be specified: "
-                f"{', '.join(repr(par) for par in require_any)}."
-            )
+            msg.append[
+                (
+                    "At least one of the following parameters must be specified: "
+                    f"{', '.join(repr(par) for par in require_any)}."
+                )
+            ]
         if exclusive:
-            msg = (
-                "Mutually exclusive parameter(s) are specified: "
-                f"{', '.join(repr(par) for par in exclusive)}."
-            )
+            msg.append[
+                (
+                    "Mutually exclusive parameter(s) are specified: "
+                    f"{', '.join(repr(par) for par in exclusive)}."
+                )
+            ]
         if reason:
-            msg += f" {reason}"
-        super().__init__(msg)
+            msg.append(reason)
+        super().__init__(" ".join(msg))