Dictionaries

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In Python, a dictionary is a collection of key-value pairs. Each key is unique and is used to access its corresponding value. Here's an example of a simple dictionary:

Python:

person = {
    "name": "Alice",
    "age": 30,
    "occupation": "Engineer"
}

In this example, we define a dictionary called person with three key-value pairs. The keys are "name", "age", and "occupation", and the corresponding values are "Alice", 30, and "Engineer".

You can access the values of a dictionary using the keys. For example:

Python:

print(person["name"])
print(person["age"])
print(person["occupation"])

This would output:

Python:

Alice
30
Engineer

You can also modify the values of a dictionary by assigning new values to its keys. For example:

Python:

person["age"] = 31
print(person["age"])

This would output:

Python:

31

You can add new key-value pairs to a dictionary by assigning a value to a new key. For example:

Python:

person["city"] = "New York"
print(person["city"])

This would output:

Python:

New York

You can use the del keyword to delete a key-value pair from a dictionary. For example:

Python:

del person["occupation"]
print(person)

This would output:

Python:

{'name': 'Alice', 'age': 31, 'city': 'New York'}

You can also loop through a dictionary using a for loop. For example:

Python:

for key in person:
    print(key, person[key])

This would output:

Python:

name Alice
age 31
city New York

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