Add exceptions module.

exceptions.py

@@ -0,0 +1,38 @@
+"""This module holds exceptions to be used with Alpyca."""
+
+
+class NumericError(Exception):
+    """Exception for when Alpaca throws an error with a numeric value.
+    
+    Args:
+        ErrorNumber (int): Non-zero integer.
+        ErrorMessage (str): Message describing the issue that was encountered.
+    
+    """
+
+    def __init__(self, ErrorNumber: int, ErrorMessage: str):
+        """Initialize NumericError object."""
+        super().__init__(self)
+        self.message = "Error %d: %s" % (ErrorNumber, ErrorMessage)
+
+    def __str__(self):
+        """Message to display with error."""
+        return self.message
+
+
+class ErrorMessage(Exception):
+    """Exception for when Alpaca throws an error without a numeric value.
+    
+    Args:
+        Value (str): Message describing the issue that was encountered.
+    
+    """
+
+    def __init__(self, Value: str):
+        """Initialize ErrorMessage object."""
+        super().__init__(self)
+        self.message = Value
+
+    def __str__(self):
+        """Message to display with error."""
+        return self.message