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In this case, you'll be able to get the sequence: start, start + 1, start + 2, and so on up to stop-1. The syntax is as follows: range(start,stop) You can start at any arbitrary index by setting the start value to the index that you'd like to start from. You may not always want to start at zero.
#PYTHON RANGE HOW TO#
#NOTHING HERE How to Use Python's range() Function with Explicit Start and End Indices This is because the default start value is assumed to be 0, and you cannot count up from 0 to -5.
#PYTHON RANGE CODE#
In this case, if you use only the stop argument, you'll not get the desired output, though the code doesn't throw an error. Sometimes, you may need to use negative integers instead. Notice how my_list is 7 items long, and the indices obtained are from 0 through 6, as expected. In the above code, you use both the valid indices, and the list items at those valid indices.
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Remember, you can use Python's built-in function len to get the length of any iterable.
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You can access all items in the list by knowing their indices, and you can get those indices using range() as shown below: my_list = , len-1 – is the sequence of valid indices. So to traverse any iterable, all you need to do is to set the stop value to be equal to len. This is why it's convenient to use range() to loop through iterables.Īn iterable of length len has 0, 1, 2. If you remember, all iterables in Python follow zero-indexing. And you loop through the returned range object using a for loop to get the indices 0,1,2,3,4 as expected. ▶ Consider the following example where you call range() with 5 as the argument. You can use the above line of code to get a sequence from 0 through stop-1 : 0, 1, 2, 3., stop-1. In the subsequent sections, you'll learn about the different ways of using the range() function.ĪDVERTISEMENT How to Use Python's range() Function to Loop Through Any IterableĪs mentioned in the previous section, you only need one positive integer to use the range() function. If you don't specify the step value, the default step size of 1 is used.If you don't specify the start index, the default start index of 0 is used.If you specify a floating point number instead, you'll run into a TypeError as shown: You must specify the required argument stop, which can be any positive integer.When you use this syntax in conjunction with a loop, you can get a sequence of indices from start up to but not including stop, in steps of step. You can use the range() function with the following general syntax: range(start,stop,step) Rather, it returns a range object which returns the indices as and when you need them. This range object in turn returns the successive items in the sequence when you iterate over it.Īs stated above, the range function does not return a list of indices. The range() function returns a range object. Understanding Python's range() Functionīefore looking at the different ways of using the range() function, you've got to understand how it works. In this tutorial, you'll learn about the different ways in which you can use the range() function – with explicit start and stop indices, custom step size, and negative step size. You'll often use range() in conjunction with a for loop. In Python, can use use the range() function to get a sequence of indices to loop through an iterable.