Python 3 Programming Tutorial - Dictionaries

In this Python 3 programming tutorial, we cover Python dictionaries. Dictionaries are a data structure in Python that are very similar to associative arrays. They are unordered and contain "keys" and "values." Each key is unique and the values can be just about anything.

Dictionaries are sets and they are defined with {} curly braces.

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[caster]

R.I.P. Tim 2:41 - 4:15 He has been killed by the del function.

[IvayloSpasov]

This was a deadly tutorial for Tim, but very usefull for me. ;) Thanks!

[crimeariver]

you are a nice young man, thank you for helping me learn to use python. Now my grandchildren wont think im so lame

[Scaryder]

Tim was the one ringing the bell at the end

[magikarpusedsplash]

The real tragedy here is Jeff, who could've been born, but never had a chance thanks to Kevin.

[kevinkuzwayo]

Tim lol, i just laughed hard... thnx man, i'll never forget this lesson

[RealMcDudu]

A big plus on dictionaries is that they are faster to iterate over if you're searching an item in them (compared against lists or tuples). For example, say you have a list, a tuple and a dictionary, all holding the same values (for dictionary - the values should be keys).
The command: " if ___ in *** " will take more time on list > tuple > dictionary.

I made identical arrays, and timed it ( x 100, 000 times ) and it came out 0.196 for the list, 0.166 for the tuple, and 0.128 for the dictionary. This might seem like a small difference, but when you're dealing with large data - this is very noticeable (it's the difference between running a program and having it finish in 2 seconds to needing to wait a few long hours...)

[JTutorials]

It was me who shouted 'brown'.

[vamsisai]

finally i found some good tutorials. thank u your videos are very helpful

[GonsalvoDeCordova]

Thanks for the associative array comparison.  Takes me back to my Perl days.  Good times, good times ...

[sandipanaich]

You would be proud to know that Tim fought bravely against del.

[intyinty]

nice.i was confused how to use Dictionary until i wathced your video! thank you for your videos! keep it up!

[Alptraum]

man you have updated your digs since 2014 I'll tell you hwhat

[kimyk]

In this example you are using key to get the value.How would you do the opposite.For example use the value to match the key?

[hemantbhatt]

Yes request : if we know and learn but when a problem or creating a software program question is given it’s How do we implement what we learn or practice

[ShahrukhNasir]

Your python videos are amazing.. Keep it up, I want to learn Client Server Chat Application in Python, can you make it and upload a tutorial of it for me, That would be a huge favour man

[leochen]

Could u please do a video of dynamic programming?

[sonickk]

You just explained a lot to me XD Not really to do with _dictionaries_, but rather with that you said about dictionaries being unordered. I loop through dictionaries a lot, and it really confused me about how the values weren't printed out in order.

Great tutorial! Python is an amazing language, and you've probably been using it longer than me (I've been using it around 3 years, but only within the past year or so is when I really got into use it heavily). Poor Tim :|

[lannybh]

Hey, you have great tutorials! I learnt a lot from them. I wonder if you can do a tutorial ---> Using user input to create dictionaries in Python using while loops? - This would be much appreciated. Keep up the good work!

[haimifrah]

How I can input new key and value with input? For example I want to create address book and I need dictionaries.