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Dictionary
A dictionary is changeable and indexed like a list and unordred like a set. A dictionairy contains keys and values. |
Dictionary example
Car = {
"brand": "Ford",
"model": "Focus",
"year": 2013
}
print(Car)
>>>{'brand': 'Ford', 'model': 'Focus', 'year': 2013}
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The dict() Constructor
thisdict = dict(brand="Ford", model="Focus", year=2013)
|
Accessing Items
Example 1
x = Car["model"]
Example 2
x = Car.get("model") |
Check if Key Exists
Check if "year" is present in the dictionary:
if "year" in Car:
print("Yes, 'year' is one of the keys in the Car dictionary") |
Adding Items
Car["Combined MPG"] = 32
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Removing Items
Car.pop("year")
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The pop() method removes the item with the specified key name |
Car.popitem()
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The popitem() method removes the last inserted item |
del Car["year"]
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The del keyword removes the item with the specified key name |
Delete a Dictionary
del Car
print(Cars) #this will cause an error because "Cars" no longer exists.
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Return an Empty Dictionary
Copy a Dictionary
Example 1
CarCopy = Car.copy()
Example 2
CarCopy = dict(Car) |
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Nested Dictionaries
Cars = {
"Car1":{
"brand":"Ford",
"model":"Focus"
},
"Car2":{
"brand":"Fiat",
"model":"Punto"
}
}
|
Create a nested dictionary from two existing dictionairies. |
Car1 = {
"brand": "Ford",
"model": "Focus"
}
Car2 = {
"brand": "Fiat",
"model": "Punto"
}
Cars = {
"Car1": Car1,
"Car2": Car2
}
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