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Concept visual
You can access the items of a dictionary by referring to its key name, inside square brackets:
Get the value of the "model" key:
thisdict = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}Formula
x = thisdict["model"]that will give you the same result:
Get the value of the "model" key:
Formula
x = thisdict.get("model")method will return a list of all the keys in the dictionary.Get a list of the keys:
Formula
x = thisdict.keys()The list of the keys is a view of the dictionary, meaning that any changes done to the dictionary will be reflected in the keys list.
Add a new item to the original dictionary, and see that the keys list gets updated as well:
car = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}Formula
x = car.keys()print(x) #before the change car["color"] =
"white"
print(x) #after the changemethod will return a list of all the values in the dictionary.Get a list of the values:
Formula
x = thisdict.values()The list of the values is a view of the dictionary, meaning that any changes done to the dictionary will be reflected in the values list.
Make a change in the original dictionary, and see that the values list gets updated as well:
car = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}Formula
x = car.values()print(x) #before the change car["year"]
= 2020 print(x) #after the changeAdd a new item to the original dictionary, and see that the values list gets updated as well:
car = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}Formula
x = car.values()print(x) #before the change car["color"]
= "red"
print(x) #after the changemethod will return each item in a dictionary, as tuples in a list.Formula
Get a list of the key:value pairs x = thisdict.items()The returned list is a view of the items of the dictionary, meaning that any changes done to the dictionary will be reflected in the items list.
Make a change in the original dictionary, and see that the items list gets updated as well:
car = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}Formula
x = car.items()print(x) #before the change car["year"]
= 2020 print(x) #after the changeAdd a new item to the original dictionary, and see that the items list gets updated as well:
car = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}Formula
x = car.items()print(x) #before the change car["color"]
= "red"
print(x) #after the changeTo determine if a specified key is present in a dictionary use the in keyword:
Check if "model" is present in the dictionary:
thisdict = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
if "model" in thisdict:
print("Yes, 'model' is one of the keys in the thisdict dictionary")