Stride, also known as step or interval, is a way of selecting every nth element of a sequence. In Python, you can specify a stride when slicing a string or any other sequence using the syntax string[start:end:step], where start is the index of the first character to include in the slice, end is the index of the first character to exclude from the slice, and step is the size of the stride.
Here are some examples of slicing strings with a stride in Python:
string = "Hello, world!"print(string[::2]) # Output: "Hlo ol!"print(string[1::2]) # Output: "el,wrd"print(string[::-1]) # Output: "!dlrow ,olleH" |
In these examples, we use a stride of 2 to extract every other character from the string string. We start at the beginning of the string and end at the end of the string, so we omit the start and end indices. We also use a stride of 2 to extract every other character starting from the second character of the string. Finally, we use a stride of -1 to reverse the order of the string.
You can use any positive or negative integer as the stride in Python. If you use a positive stride, the slice is taken from left to right. If you use a negative stride, the slice is taken from right to left.