![]() 1 is the increment factor so this will decrement the values by 1 at each step. As explained by the syntax, the starting element is len(list)-1 that is the last index of the list. This is the final variant where there are multiple -1s. Note the first element that is at index 0 which is 10 is not printed. This will generate the indices of the list in reverse order but not as the index starts from 0 and the sequence will end when 0 is generated, the first index of the list will not be generated.įollowing will be the output of the above Python code: Index 4 : 12 The increment is -1 that is the sequence is decremented by 1 at each step. The starting index is the last index of the list and sequence will terminate when 0 is generated. In this variant, we have provided all parameters. Note the last element at index 4 which is 12 is not printed. In this variant, we have updated len(list) to len(list)-1 that is we are eliminating the last element of the list. Range(len(list)) is used to generate all sequence of indices in a list as the ending number is length of the list and the starting index is 0 so that last index is length-1.Ĭonsider the following Python code snippet: list = įollowing will be the output of the above Python code: Index 0 : 10 If range(9, 15, 2), then the sequence is:Īs only the ending index is complusory, then if one number is provided to range() then the starting number is set to 0 and increment is set to 1. This generates a list of numbers starting with the number "starting_index", incrementing with value "increment" and ending before the number "last_index". This is optional and the default value is 1. increment: This is the value by which the starting index is incremented at each step.last_index: This is the value at which the iteration or list need to be stopped.starting_index: This is optional and the default value is 0.The structure of range is as follows: range(starting_index, last_index, increment) Range is a built-in function in Python that is used to generate a list of numbers. We will start with a basic for loop in Python and incrementally change the code to arrive to Range len-1 in Python. # do something like learning at OpenGenus In short, the for loop in Python " for i in range(len(list)-1, -1, -1)" is used to loop through all elements of a list in reverse order that is from end to first. ![]() In this article, we have explained the Python code snippet "range(len(list)-1, -1, -1)" and other variants of the code snippet.
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