CodeSquire is an AI code writing assistant designed to aid data scientists. It provides support for Jupyter, VS Code, Pycharm, and Google Colab. It is engineered to generate entire functions that align with different data science use cases. CodeSquire is capable of converting comments into code, writing complex functions, and translating simple instructions into SQL queries. A significant feature is its ability to compose functions using popular libraries, thereby limiting the need to search for library methods and parameters. Furthermore, CodeSquire enables the coding process to be more efficient by offering code completions and suggestions as users type. This tool serves to boost productivity by transforming thoughts into code. CodeSquire can also be used to help understand existing code by providing plain text explanations for functions. It additionally offers a Chrome extension for added utility.