Map Example In Python 3

Map Function In Python 3 from finding-maps.blogspot.com

Introduction

Python is a high-level programming language that has gained immense popularity in the past few years. One of the key reasons for its popularity is its ability to handle complex data structures with ease. One such data structure is a map, which is also known as a dictionary in Python. In this article, we will explore the concept of a map in Python 3 and how it can be used to solve real-world problems.

What is a Map in Python 3?

In Python 3, a map is a collection of key-value pairs. It is similar to a dictionary in Python, where each key is associated with a value. The key-value pairs in a map are unordered, which means that they are not stored in any particular order. Maps are useful when you want to store data in a way that makes it easy to search for a specific value.

How to Create a Map in Python 3?

You can create a map in Python 3 by using the curly braces { }. To create a map with key-value pairs, you can separate each pair with a comma. Here is an example: ``` my_map = {"apple": 1, "banana": 2, "cherry": 3} ``` In this example, we have created a map with three key-value pairs. The keys are "apple", "banana", and "cherry", and the values associated with these keys are 1, 2, and 3, respectively.

Working with Maps in Python 3

Now that we know how to create a map in Python 3, let's explore some of the operations that can be performed on maps.

Accessing Values in a Map

To access the value associated with a key in a map, you can use the square bracket notation. Here is an example: ``` my_map = {"apple": 1, "banana": 2, "cherry": 3} print(my_map["apple"]) ``` In this example, we are accessing the value associated with the key "apple" in the map. The output of this program will be 1.

Updating Values in a Map

To update the value associated with a key in a map, you can simply assign a new value to the key. Here is an example: ``` my_map = {"apple": 1, "banana": 2, "cherry": 3} my_map["banana"] = 4 print(my_map) ``` In this example, we are updating the value associated with the key "banana" in the map. The output of this program will be {"apple": 1, "banana": 4, "cherry": 3}.

Deleting a Key-Value Pair from a Map

To delete a key-value pair from a map, you can use the del keyword. Here is an example: ``` my_map = {"apple": 1, "banana": 2, "cherry": 3} del my_map["banana"] print(my_map) ``` In this example, we are deleting the key-value pair associated with the key "banana" in the map. The output of this program will be {"apple": 1, "cherry": 3}.

Real-World Examples of Maps in Python 3

Now that we have learned how to work with maps in Python 3, let's explore some real-world examples where maps can be used to solve problems.

Example 1: Counting the Frequency of Words in a Text File

Suppose you have a large text file and you want to count the frequency of each word in the file. One way to do this is to use a map. Here is an example: ``` text_file = open("example.txt", "r") word_count = {} for line in text_file: # Remove any leading or trailing whitespace from the line line = line.strip() # Split the line into words words = line.split() # Update the word count for each word for word in words: if word in word_count: word_count[word] += 1 else: word_count[word] = 1 text_file.close() print(word_count) ``` In this example, we are reading a text file called "example.txt" and counting the frequency of each word in the file. The output of this program will be a map where each key is a word and each value is the frequency of that word in the file.

Example 2: Creating a Phone Directory

Suppose you want to create a phone directory where you can store the phone numbers of your friends and family. One way to do this is to use a map. Here is an example: ``` phone_directory = {"John": "555-1234", "Jane": "555-5678", "Bob": "555-9012"} ``` In this example, we have created a phone directory where each key is a person's name and each value is their phone number. This map can be easily updated as new phone numbers are added or old phone numbers are changed.

Conclusion

In this article, we have explored the concept of a map in Python 3 and how it can be used to solve real-world problems. We have learned how to create a map, access values in a map, update values in a map, and delete key-value pairs from a map. We have also seen two real-world examples where maps can be used to solve problems. With these skills, you should be able to use maps in your own Python 3 programs to make them more powerful and efficient.

Table of Contents

Introduction

What is a Map in Python 3?

How to Create a Map in Python 3?

Working with Maps in Python 3

Accessing Values in a Map

Updating Values in a Map

Deleting a Key-Value Pair from a Map

Real-World Examples of Maps in Python 3

Example 1: Counting the Frequency of Words in a Text File

Example 2: Creating a Phone Directory

Conclusion

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