Slicing is the process of extracting a substring from a larger string by specifying a range of indices. In Python, you can slice a string using the syntax string[start:end], where start is the index of the first character to include in the slice, and end is the index of the first character to exclude from the slice.
Here are some examples of slicing strings in Python:
string = "Hello, world!"print(string[7:]) # Output: "world!"print(string[:5]) # Output: "Hello"print(string[2:7]) # Output: "llo, " |
In these examples, we define a string string and then use slicing to extract substrings from the string. We use the colon : character to separate the start and end indices of the slice. If you omit the start index, Python assumes that you want to start at the beginning of the string. If you omit the end index, Python assumes that you want to slice until the end of the string.
You can also use negative indices when slicing strings in Python. In this case, the end index represents the position of the first character to exclude from the slice, and the start index represents the position of the last character to include in the slice.
string = "Hello, world!"print(string[:-1]) # Output: "Hello, world"print(string[-6:-1]) # Output: "world" |
In these examples, we use negative indices to slice the string string in reverse order. The -1 index represents the last character of the string, so we exclude it from the slice to get the substring "Hello, world". We also use a range of negative indices to extract the substring "world".