Python Dictionary

Python dictionary is an unordered collection of key-value pairs. It is one of the most frequently used data structures in Python programming.

Creating a Dictionary

A dictionary can be created by placing a comma-separated list of key-value pairs inside braces {}. Each key-value pair is separated by a colon :. Here's an example:

# Creating a dictionary
person = {"name": "John", "age": 20, "gender": "Male"}

Accessing Values

You can access the values of a dictionary by referring to its key name inside square brackets []. Here's an example:

# Accessing values of a dictionary
print(person["name"])   # Output: John
print(person["age"])    # Output: 20

Updating Values

You can update the value of a dictionary by referring to its key name and assigning its new value. Here's an example:

# Updating the value of a dictionary
person["age"] = 25
print(person["age"])    # Output: 25

Looping Through a Dictionary

You can loop through a dictionary by using a for loop and referring to its keys. Here's an example:

# Looping through a dictionary
for key in person:
    print(key, person[key])

Dictionary Methods

Python dictionary provides several methods to perform various tasks. Some commonly used methods are:

• keys(): Returns a list of all the keys in the dictionary.
• values(): Returns a list of all the values in the dictionary.
• items(): Returns a list of all the key-value pairs in the dictionary.
• pop(): Removes the element with the specified key and returns its value.
• clear(): Removes all the elements from the dictionary.

Conclusion

Python dictionary is a powerful and versatile data structure that can help you to store, access, and manipulate key-value pairs. It provides several methods to perform various tasks, and it is an essential tool for any Python programmer.