value associated with that key is forgotten. It is an error to extract a value
using a non-existent key.
-Preforming ``list(d.keys())`` on a dictionary returns a list of all the keys
+Performing ``list(d.keys())`` on a dictionary returns a list of all the keys
used in the dictionary, in arbitrary order (if you want it sorted, just apply
-the :meth:`sort` method to the list of keys). To check whether a single key is
+the :meth:`sorted` function instead). To check whether a single key is
in the dictionary, use the :keyword:`in` keyword.
Here is a small example using a dictionary::
>>> tel
{'guido': 4127, 'irv': 4127, 'jack': 4098}
>>> list(tel.keys())
+ ['irv', 'guido', 'jack']
+ >>> sorted(tel.keys())
['guido', 'irv', 'jack']
>>> 'guido' in tel
True
For efficiency reasons, each module is only imported once per interpreter
session. Therefore, if you change your modules, you must restart the
interpreter -- or, if it's just one module you want to test interactively,
- use :func:`reload`, e.g. ``reload(modulename)``.
+ use :func:`imp.reload`, e.g. ``import imp; imp.reload(modulename)``.
.. _tut-modulesasscripts: