![]() Usually, when step is negative, start is greater than the stop, and r should be greater than stop.įor example, if start=8, stop=2 and step=-2, then the contents of range are calculated as given below. r = start + (step * i) such that i>=0, r>stop But the main difference is that the step itself is negative. The formula remains same as that of with positive step. When you provide a negative step to range(), contents of the range are calculated using the following formula. If you provide two or three arguments, then the second form of the constructor range(start, stop) shall be considered. Internally range(stop) calls the constructor range(start, stop) with start=0. If you provide only one argument to range() function, the first form of range() function in the above syntax range(stop) shall be used with default value of start=0. If step is not specified, then 1 is taken as default value for step.Īll start, stop and step must be integers. Step represent the value by which the elements are updated from start to end. ![]() Meaning, the range() returns a range that can be iterated only until stop, but not stop. If start is not specified, 0 is taken as start. Meaning, the range() returns a range that contains start as first element. Start represents the starting of the range. Range() function is a constructor of range class. In this tutorial, you will learn the syntax of range() function, and then its usage with the help of example programs. Or, take the next step in mastering the Python language and earn a certificate from the University of Michigan in Python 3 programming.Python range() builtin function is used to create an immutable sequence of numbers defined by a specific start, end, and a step value. You can practice working with for loops with a Guided Project like Concepts in Python: Loops, Functions, and Returns. Keep improving your Python skills with Coursera. ![]()
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