The Python Apprentice

Dictionaries

We'll now return to dictionaries, which lie at the heart of many Python programs, including the Python interpreter itself. We briefly looked at literal dictionaries previously, seeing how they are delimited with curly braces and contain comma-separated key value pairs, with each pair tied together by a colon:

>>> urls = {'Google': 'http://google.com',...         'Twitter': 'http://twitter.com',...         'Sixty North': 'http://sixty-north.com',...         'Microsoft': 'http://microsoft.com' }>>>

A dictionary of URLs. The order of dictionary keys is not preserved, refer to the following diagram:

Figure 5.20: Dictionary

The values are accessible via the ...