Python Tutorial for Beginners 5: Dictionaries - Working with Key-Value Pairs
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- čas přidán 16. 05. 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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Watch the full Python Beginner Series here:
• Python Programming Beg...
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#Python
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
Nice, this helps, thanks
thank u
God among men.
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Fulfill thy promise and donate, my child.. or face the wrath of our comments
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I’ve noticed a lot of these ppl who know compsci say they were self taught so it’s not like a regular class that would have traditional methods of teaching
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You literally explained lists and dictionaries in the simplest terms possible. Thank you so much, I don’t know why professors cannot be like this. You literally gave me more of a clear understanding with the logic and the syntax behind creating dictionary lists with keys and values, as opposed to how my professor does it. Thanks so much. I subscribed. Looking forward to more tutorials.
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how well do you know python now? I'm about to watch the next video after this dictionary one. Gonna continue on but just wondering has it benefited you yet?
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hey, are you programmer or python expert now?
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Glad to hear that!
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Explanation
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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Very good video that gave a well rounded overview and intro to dictionaries. I'm compsci senior and somehow dictionaries got past me. This was a good breakdown. Thank you!
Hey Corey!
I love the way you cover the concepts in your video tutorials! Many thanks!
Could you please cover the topic of OrderedDict and UserDict and Collections module in general.
That would be very helpful
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I really do feel comfortable with dictionaries now! Thanks a lot.
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Its easy feel comfortable with the dictionary with this video. Thanks a lot!
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foods = {
"pizza": 20,
"burger": 40,
"hotdog": 30,
"pasta": 25,
"salad": 15,
"steak": 50
}
order = []
total = 0
print("Menu:")
for food, price in foods.items():
print(f"{food}: ${price:.2f}")
while True:
food = input("Enter the food you'd like to order or q to quit: ").lower()
if food == "q":
break
elif food not in foods:
print("Invalid food item!")
else:
order.append((food, foods[food]))
total += foods[food]
print(f"{food} added to order. Total cost so far: ${total:.2f}")
print("Order summary:")
for item in order:
print(f"{item[0]}: ${item[1]:.2f}")
print(f"Total cost is: ${total:.2f}")
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Excellent tutorials. Thank you Corey. Much appreciated.