Python -Access Dictionary Items
Accessing Items
You can access the items of a dictionary by referring to its key name, inside square brackets:
Example
Get the value of the "model" key:
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
x = thisdict["model"]
There is also a method calledget() that will give you the same result:
Get Keys
Thekeys() method will return a list of all the keys in the dictionary.
The list of the keys is aview of the dictionary, meaning that any changes done to the dictionary will be reflected in the keys list.
Example
Add a new item to the original dictionary, and see that the keys list gets updated as well:
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
x = car.keys()
print(x) #before the change
car["color"] = "white"
print(x) #after the change
Get Values
Thevalues() method will return a list of all the values in the dictionary.
The list of the values is aview of the dictionary, meaning that any changes done to the dictionary will be reflected in the values list.
Example
Make a change in the original dictionary, and see that the values list gets updated as well:
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
x = car.values()
print(x) #before the change
car["year"] = 2020
print(x) #after the change
Example
Add a new item to the original dictionary, and see that the values list gets updated as well:
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
x = car.values()
print(x) #before the change
car["color"] = "red"
print(x) #after the change
Get Items
Theitems() method will return each item in a dictionary, as tuples in a list.
The returned list is aview of the items of the dictionary, meaning that any changes done to the dictionary will be reflected in the items list.
Example
Make a change in the original dictionary, and see that the items list gets updated as well:
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
x = car.items()
print(x) #before the change
car["year"] = 2020
print(x) #after the change
Example
Add a new item to the original dictionary, and see that the items list gets updated as well:
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
x = car.items()
print(x) #before the change
car["color"] = "red"
print(x) #after the change
Check if Key Exists
To determine if a specified key is present in a dictionary use thein keyword:
Example
Check if "model" is present in the dictionary:
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
if "model" in thisdict:
print("Yes, 'model' is one of the keys in the thisdict dictionary")
