Python Tutorial for Beginners 5: Dictionaries - Working with Key-Value Pairs
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- เผยแพร่เมื่อ 16 พ.ค. 2017
- In this Python Beginner Tutorial, we will begin learning about dictionaries. Dictionaries allow us to work with key-value pairs in Python. We will go over dictionary methods, how to add and remove values, and also how to loop through the key-value pairs. Let's get started.
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0:07 - Terminology
0:14 - Key/Value pairs definition
0:37 - First example (Student using a dictionary)
0:45 - { }, Dict notation, curly braces,
0:50 - adding elements
1:32 - [ ] Square bracket access of the dict
2:04 - Dict items can be many things, they’re not bound to one “type”
2:14 - Keys can be any immutable data type
2:24 - Example of an Integer being the key
2:44 - Accessing a key that does not exist
3:00 - Alternative to “throwing an error” if a key does not exist
3:05 - Sometimes you will want to return None or a default value if key does not exist
3:09 - .get( ) access of the dict
3:30 - accessing a key that does not exist with the .get method as opposed to [ ] square bracket access
3:40 - Specifying a default value for keys that do not exist
4:01 - Adding a new entry to dictionary
4:30 - Changing/updating values via key access
5:02 - Changing/updating values via .update() method
5:21 - .update() takes in a dict as an argument
5:57 - Deleting a specific key and its value
6:01 - Option 1 for deleting a key and value: del keyword
6:26 - Option 2 for removing a key and value: .pop() method
6:30 - Remember the .pop() method not only removes the item put pops it off or returns it to you
6:35 - Therefore you can recover the popped item with a variable assignment
7:07 - How to loop through all the keys and values
7:13 - Finding out the number of keys in dict with len() function
7:30 - Print all keys with .keys() method
7:39 - Print all values with .values() method
7:47 - Print both keys and values with .items() method
8:07 - Looping is slightly different then lists because dicts are concerned with pairs (Key : Value)
8:33 - How to loop through keys AND values
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Hey Corey, I know these videos are geared towards beginners like myself - and also a few years old at this point - but it would be helpful to explain how each concept in the tutorials are used in the real world, beyond just printing out values.
Hopefully this makes sense! Thank you for the instruction - I appreciate your teaching style
He kinda does that... The code he used *could* be used in a program that calculates a student's grades or keeps track of them like google classroom. However, it was simplified for the video. Hope this helps
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Explanation
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