[Python] Module defined names

Module defined names

The built-in function ‘dir()’ can be used to find out which names a module defines. It returns a sorted list of strings.

```
>>> import time
>>> dir(time)
[‘__doc__’, ‘__file__’, ‘__name__’,
‘__package__’, ‘accept2dyear’,
‘altzone’, ‘asctime’, ‘clock’,
‘ctime’, ‘daylight’, ‘gmtime’,
‘localtime’, ‘mktime’, ‘sleep’,
‘strftime’, ‘strptime’, ‘struct_
time’, ‘
```