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How to Create a Currency Converter in Python

Written by Rahul Lath

Updated on: 07 Dec 2023

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Building a python currency converter is a fantastic project for both newcomers and seasoned developers interested in working with APIs, data manipulation, and real-time data. Whether you’re a traveler, a student of international finance, or a developer aiming to incorporate currency conversion into your applications, understanding how currency conversion works and how to build it can be valuable.

In this detailed guide, we will take you through the complete process of setting up your Python environment, understanding essential concepts like variables, functions, libraries, and APIs, and finally writing and deploying a currency converter python project. By the end of this tutorial, you’ll have a working currency converter that fetches real-time exchange rates and can convert between different currencies.

Not only does this project help you practice key programming concepts, but it also opens doors to further exploration into financial technologies and integration with various applications. So, if you are looking to learn python with experts or want to deepen your understanding of real-world applications, this tutorial on creating a currency converter project in python is the right fit for you.

Here’s what we’ll cover:

  • Setting Up Your Python Environment: From installing Python to setting up your code editor.
  • Python Basics for Currency Conversion: Understanding essential Python concepts that will be used in the project.
  • Understanding APIs and Their Role in Currency Conversion: A deep dive into what APIs are, how they work, and why they are crucial for currency conversion.
  • Introduction to the Foreign Exchange Rates API: An overview of the specific API we’ll be using.
  • Writing the Python Code for the Currency Converter: Step-by-step instructions to create your currency converter.
  • Enhancing Your Currency Converter: Adding error handling and user input functionalities.
  • Testing Your Currency Converter: Importance of testing and how to conduct tests.
  • Deploying Your Currency Converter: Preparing your code and choosing a deployment platform.

Setting Up Your Python Environment

Installing Python

Before building your python currency converter, you need to make sure that Python is installed on your system. Here are the steps to install Python:

  1. Visit the official Python website: Go to python.org.
  2. Download the appropriate version: Choose the version suitable for your operating system.
  3. Run the Installer: Follow the prompts and make sure to check the box to add Python to your PATH.

Python Basics for Currency Conversion

Understanding the following concepts is essential for building a currency converter project in python:

Understanding Variables and Data Types

Variables are containers that hold data. Here’s a brief overview of common data types you’ll be working with:

  • Strings: Textual data, e.g., “USD”, “EUR”.
  • Numbers: Floats and integers, e.g., 1.20, 100.
  • Lists: Ordered collections, e.g., [‘USD’, ‘EUR’, ‘GBP’].

Introduction to Functions

Functions are reusable blocks of code. You’ll create functions to fetch exchange rates and convert currencies.

Working with Libraries

Python libraries enhance functionality. For this project, you’ll use libraries like requests for API calls.

Understanding APIs and Their Role in Currency Conversion

What is an API?

An API (Application Programming Interface) is a set of rules and protocols that allow different software entities to communicate with each other. In the context of a python currency converter, APIs allow us to fetch real-time exchange rates from financial institutions or platforms.

How APIs Work

  1. Request: Your program sends a request to an API hosted on a web server. The request includes specific information you want to retrieve, like exchange rates for USD to EUR.
  2. Response: The API processes the request and sends back the required information in a structured format, typically JSON or XML.

Importance of APIs in Currency Conversion

Without APIs, it would be incredibly challenging to obtain real-time exchange rates. By using APIs, your currency converter python application can:

  • Access up-to-date data directly from reliable sources.
  • Automatically update the conversion rates without manual intervention.
  • Ensure accuracy and reliability in conversions.

Introduction to the Foreign Exchange Rates API

Overview of the Foreign Exchange Rates API

For this currency converter project in python, we will use the Foreign Exchange Rates API. It provides exchange rates published by various central banks and financial institutions.

Setting Up the Foreign Exchange Rates API

  1. Sign Up: Visit the API provider’s website and create an account.
  2. Generate API Key: Obtain a unique key that identifies your application to the server.
  3. Documentation Review: Familiarize yourself with the API’s documentation to understand the endpoints, request parameters, and response format.

Understanding the API’s Response

The API’s response typically comes in JSON format. For example:

data = { "base": "USD", "date": "2021-10-01", "rates": { "EUR": 0.8536, "GBP": 0.7405 } }

This response includes the base currency (USD) and exchange rates for EUR and GBP.

Writing the Python Code for the Currency Converter

Creating the Basic Structure of the Program

Begin by defining the basic structure and import necessary libraries:

import requests def main(): # Main program logic here if __name__ == "__main__": main()

Writing the Function to Fetch Current Exchange Rates

Create a function to make an API call:

def get_exchange_rates(base_currency): api_url = f"https://api.exchangerate-api.com/v4/latest/{base_currency}" response = requests.get(api_url) return response.json()["rates"]

Writing the Function to Convert Between Currencies

Here’s a simple function to convert between currencies:

def convert_currency(amount, from_currency, to_currency, rates): return amount * rates[to_currency] / rates[from_currency]

Enhancing Your Currency Converter

Adding Error Handling

Error handling ensures that the program doesn’t crash if something goes wrong, like an API failure. You can use try-except blocks:

try: rates = get_exchange_rates(base_currency) except: print("Error fetching exchange rates.") return

Incorporating User Input

You can use the input() function to accept user inputs for the amount, source currency, and target currency.

Displaying Results in a User-Friendly Format

Format the result to make it more readable:

print(f"{amount} {from_currency} is equal to {converted_amount} {to_currency}.")

Testing Your Currency Converter

Ensuring that your python currency converter works correctly is crucial before deployment. Testing verifies that the code functions as expected and helps to identify any potential issues.

Importance of Testing

  • Accuracy: Ensures that the conversion rates are correct.
  • Reliability: Validates that the system will work under different scenarios.
  • Maintainability: Helps in understanding potential future issues.

Conducting Unit Tests

Unit tests check individual components or functions within the program. For the currency converter python application, you might test functions like fetching exchange rates or converting between currencies.

You can enhance user-friendliness by adding a graphical user interface (GUI), providing clear instructions, and formatting the output in an easily readable manner.

Conducting Integration Tests

Integration tests evaluate the entire system’s functionality. You might test how the functions work together, ensuring that the user can input values, retrieve exchange rates, and receive the correct conversion.

Deploying Your Currency Converter

Once you’re confident that the code is working correctly, the next step is deployment. This will make your currency converter project in python accessible to users.

Preparing Your Code for Deployment

  1. Refactoring: Ensure that the code is clean and follows best practices.
  2. Documentation: Add comments to describe the functionality.
  3. Dependencies: Include a requirements file listing all necessary libraries.

Choosing a Deployment Platform

Platforms like Heroku, AWS, or a personal web server can host your currency converter. The choice depends on your preferences, budget, and technical requirements.

Steps to Deploy Your Currency Converter

  1. Package Your Application: Ensure that all necessary files, including the requirements and main application file, are in one directory.
  2. Select a Platform: Choose a hosting platform and follow its specific guidelines for deploying a Python application.
  3. Monitor and Update: Regularly check the application’s performance, and update exchange rate sources if needed.


Building a python currency converter is an exciting project that involves various aspects of programming, from understanding APIs to writing functions, error handling, testing, and deployment. By following this guide, you’ll have a robust currency converter ready for use.

Recap of Building a python currency converter

  • Understanding Variables and Data Types: Crucial for handling currency values.
  • Working with Libraries: Essential for HTTP requests and JSON handling.
  • Introduction to Functions: Central to creating reusable code blocks.
  • Testing: Ensures the accuracy and reliability of the application.
  • Deployment: Makes the application accessible to users.

Further Learning and Exploration in Python

  • Enhance the user interface.
  • Implement additional error checks.
  • Explore other APIs for more features.


What is an API Key and why is it necessary?

An API Key is a unique identifier used to authenticate requests to an API. It is important to make sure that only people who are allowed to can use the API, especially if there are usage limits or fees.

How often do exchange rates update?

Exchange rates may update frequently, sometimes every minute or even more often, depending on the API used.

Can I add more currencies to my converter?

Yes, you can expand the converter by including additional currencies supported by the API.

What should I do if the API is not responding?

Check the API documentation for error codes, or contact the API provider’s support team. Implementing error handling in your code will also help manage such scenarios gracefully.

How can I make my currency converter more user-friendly?

You can enhance user-friendliness by adding a graphical user interface (GUI), providing clear instructions, and formatting the output in an easily readable manner.

The information provided offers a comprehensive understanding of how to create a python currency converter. Following this guide, you’ll be well-equipped to develop, test, and deploy a currency conversion tool that meets the modern user’s needs.

Written by

Rahul Lath

Reviewed by

Arpit Rankwar

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