Dictionaries

In this class, we will delve into dictionaries, which are data structures that store data in the form of key-value pairs.

Dictionary creation Link to heading

Dictionaries can be created using the dict() function or using {} curly braces.

Example: Link to heading

# Creating a dictionary with the dict() function
dictionary1 = dict(name="Ana", age=25)

# Creating a dictionary with braces
dictionary2 = {"name": "Ana", "age": 25}

print(dictionary1)
print(dictionary2)

Exit: Link to heading

{'name': 'Ana', 'age': 25}
{'name': 'Ana', 'age': 25}

In this example:

• Two dictionaries are created: dictionary1 and dictionary2.
• Both dictionaries store the same data: a person’s name and age.
• The first dictionary is created using the dict() function. The second dictionary is created using braces {}.

Access to values Link to heading

The values ​​of a dictionary can be accessed using the key.

Example: Link to heading

dictionary = {"name": "Ana", "age": 25}

name = dictionary["name"]
age = dictionary["age"]

print(name)
print(age)

Exit: Link to heading

Ana
25

In this example:

• The value of the key “name” is accessed and saved in the variable name.
• The value of the key “age” is accessed and saved in the variable age.

Modification of values Link to heading

You can modify the value of a dictionary using the key.

Example: Link to heading

dictionary = {"name": "Ana", "age": 25}

dictionary["age"] = 26

print(dictionary)

Exit: Link to heading

{'name': 'Ana', 'age': 26}

In this example: The value of the “age” key is modified to 26.

Dictionary methods Link to heading

Dictionaries have keys() and values() methods that can be used to perform different tasks.

Example: Link to heading

dictionary = {"name": "Ana", "age": 25}

print(dictionary.keys())
print(dictionary.values())

Exit: Link to heading

['name Age']
['Anna', 25]

In this example: The keys() method is used to obtain a list of the dictionary keys. The values() method is used to obtain a list of the values ​​in the dictionary.

Exercise Link to heading

Create a dictionary that stores a person’s contact information (name, phone, email).