Function In Python For Data Science - Functions (): What do you understand by functions ? - It performs a predefined task or a formula - functions take some value as input and generates some value as output - input -> function -> output - it is used to reduce our effort when performing same task again and again - y = f(x) where f(x) = sin(x) - Function definition - Here we create a function - function call - Here we use the function. It works only when a function is already defined - Function definition def <function_...