Changes between Version 43 and Version 44 of DeveloperGuidelines/Py_2_3

Timestamp:

07/04/19 19:32:35 (6 years ago)

Author:

Dominic König

Comment:

--

DeveloperGuidelines/Py_2_3

@@ -79 +79 @@
 x = sorted_locale(x)
 }}}
+
+=== Raise Exceptions Instances ===
+
+Python-3 does no longer support the {{{raise E, V, T}}} syntax - the new syntax is {{{raise E(V).with_traceback(T)}}}. 
+
+However, the traceback is rarely required - and where E is an Exception class (rather than a string), we can use the {{{raise E(V)}}} syntax which works in all Python versions.
+
+{{{#!python
+# Works in Py2, but not in Py3:
+raise SyntaxError, "Error Message"
+# Works in all Python versions, hence our Standard:
+raise SyntaxError("Error Message")
+}}}
+
+If a traceback object must be passed (which is rarely needed), then we must use the PY2 constant to implement alternative statements.
 == Usage ==