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What are Functions in Python ? A function is a block of organized, reusable code that performs a specific task. Functions help break our program into smaller and modular chunks, making it more organized and manageable. In Python , you define a function using the def keyword, followed by the function name and parameters in parentheses: Python function is a block of code defined with a name. Learn to create and use the function in detail. Use function argument effectively. Creating a Function In Python , a function is defined using the def keyword, followed by a function name and parentheses: A Python function is a block of organized, reusable code that is used to perform a single, related action. Functions provide better modularity for your application and a high degree of code reusing.