ch07

ch07/exceptions/replace.py

@@ -0,0 +1,34 @@
+# exceptions/replace.py
+# This is not a valid Python module - Don't run it.
+>>> class NotFoundError(Exception):
+...     pass
+...
+>>> vowels = {'a': 1, 'e': 5, 'i': 9, 'o': 15, 'u': 21}
+>>> try:
+...     pos = vowels['y']
+... except KeyError as e:
+...     raise NotFoundError(*e.args)
+...
+Traceback (most recent call last):
+  File "<stdin>", line 2, in <module>
+KeyError: 'y'
+
+During handling of the above exception, another exception occurred:
+
+Traceback (most recent call last):
+  File "<stdin>", line 4, in <module>
+__main__.NotFoundError: y
+>>> try:
+...     pos = vowels['y']
+... except KeyError as e:
+...     raise NotFoundError(*e.args) from e
+...
+Traceback (most recent call last):
+  File "<stdin>", line 2, in <module>
+KeyError: 'y'
+
+The above exception was the direct cause of the following exception:
+
+Traceback (most recent call last):
+  File "<stdin>", line 4, in <module>
+__main__.NotFoundError: y