Are you ready for some Python fun? Let’s roll with the world of built-in functions in our favorite programming language. Say goodbye to those sleepless nights of multiplying numbers by hand because Python has got your back! With built-in functions like `math.sqrt()` or `math.pow()`, you can perform complex calculations in a snap. Let’s take a look at some other useful built-in functions that will make your coding life easier than ever before:

1. len(x) Returns the length of x (a string or list). This function is perfect for checking if a list has any elements in it, or if a string contains more than one character. 2. max(x) and min(x) These functions return the largest and smallest values respectively from a given set of numbers. Say goodbye to sorting your lists just to find the highest number! 3. abs(x) Returns the absolute value of x, which is perfect for dealing with negative numbers without having to add an extra line of code to check if they’re positive or not. 4. round(x[, n]) Rounds a given number (x) to either 0 decimal places by default, or up to n decimal places if specified. This function is perfect for dealing with currency and other numerical data that needs to be rounded off. 5. sorted(x) Sorts the elements of x in ascending order. Say goodbye to sorting your lists manually! 6. reversed(x) Returns a reverse iterator over the given sequence (list, tuple or string). This function is perfect for iterating through a list backwards without having to create a new list just for that purpose. 7. enumerate(x) Returns an enumerated version of x, which means it adds a counter variable to each element in the original list. This function is perfect for keeping track of elements and their positions within a list. 8. zip(*iterables) Combines multiple iterable (list or tuple) objects into a single iterator that returns tuples containing corresponding elements from all iterables. This function is perfect for dealing with data sets where you need to compare values across different lists. 9. filter(function, sequence) Returns an iterator of those items in the given sequence for which the given function returns true. This function is perfect for filtering out unwanted elements from a list based on certain criteria. 10. map(function, *iterables) Applies the given function to every item in each iterable and returns an iterator containing the results. This function is perfect for applying functions to multiple lists at once without having to write separate lines of code for each one.