Python Tutorial for Beginners 16 - Python Dictionary

In this video I am going to show What are Dictionaries and How to use Dictionaries in python. So What are Dictionaries in python?
dictionary in python is an associative list or a map.
We can think if dictionary as a list of pairs, where the first element of the pair, the key, is used to retrieve the second element, the value.Hence we map a key to a value.Dictionaries are Python’s most powerful data collection. Dictionaries allow us to do fast database-like operations in Python.Dictionaries are like Lists except that they use keys instead of Index to lookup values.

The list of all functions which can be use with Python Dictionaries :
['__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'clear', 'copy', 'fromkeys', 'get', 'items', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values']

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[davvoprod.]

Dictionaries are the most favorite things in Python)

[diptimaurya]

Dictionaries in python is very helpful sir

[PsSarvna]

Nice sir ...waiting for the next video.

[ConorJTobin]

Another excellent video, although I have one quick question: why does the order of the keys (and hence, their values) change after the dictionary's been defined?

[DarshanSenTheComposer]

Can keys and values be dictionaries themselves?

[johnny_pilot]

Why did the 'Surname' key get added in the 3rd position of the dictionary and not at the end? You clearly saw this happen but did not think to explain to us why this happened. It's not even to do with a - z or z - a sorting as the key 'year' comes before 'Surname', 'age' is last and 'name' is the first! And, why use 'D.items' to see all the items (key/value pairs) of a dictionary when you can simply refer to 'D' and retrieve the dictionary? No explanation! I really like your videos, whatever your name is, but you just do not explain things that really do need to be explained! We are would-be programmers and are therefore inquisitive people. Please explain anything that is clearly not obvious!