![]() Notice here that we had to assign the string to a variable (even if it we had reassigned it to itself). For example, using a string such as text'datagy', we can reverse it using backward text ::-1. ![]() This makes the step go backwards, including each element it steps on, resulting in the string being printed back in reverse: string = 'I’ll never turn to the dark side. The best way to reverse a string in Python is to use string indexing, with a step of -1. To reverse a string, we can set the step of the slice notation to -1. String = 'Now, young Skywalker, you will die.' # Prefix of length n The simplest way of extracting single characters from strings (and individual members from any sequence) is to unpack them into corresponding variables. ![]() In this particular example, the slice statement ::-1 means start at the end of the string and end at position 0, move with the step -1, negative one, which means one step backwards. In this case, -n will start counting from the end of the string, backwards, giving us a suffix: n = 4 txt 'Hello World' ::-1 print(txt) Create a slice that starts at the end of the string, and moves backwards. We'll slice from the start to n and from -n to the end of the string. To find the prefix or suffix of length n of a string, we'll use the same approach that can be used to find a tail or head of a list. To reverse a string, we simply create a slice that starts with the length of the string, and ends at index 0. This makes the step go backwards, including each element it steps on, resulting in the string being printed back in reverse: string I’ll never turn to the dark side. The negative step increment of -1 means that the slicing starts at the last element and ends at the first element, resulting in a reversed string. This will omit the first four characters in the string: I am your fatherįinding the Prefix and Suffix of Length n with Slice Notation To reverse a string, we can set the step of the slice notation to -1. To reverse a string using slicing, omit the start and stop arguments and use a negative step increment of -1. Let's go ahead and slice a string: string = 'No. ![]()
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