旋转字符串python源代码
时间: 2023-10-10 09:04:48 浏览: 50
以下是旋转字符串的Python源代码:
```python
def rotate_string(s: str, k: int) -> str:
"""
Rotate a string s by k positions to the right.
Args:
s (str): The input string.
k (int): The number of positions to rotate the string.
Returns:
str: The rotated string.
Examples:
>>> rotate_string('abcdef', 3)
'defabc'
>>> rotate_string('hello', 2)
'lohel'
"""
n = len(s)
# If k is greater than the length of the string, handle it
k = k % n
# Rotate the string by reversing it twice
s = s[::-1][:k][::-1] + s[k:][::-1][::-1]
return s
```
这个函数接受两个参数,一个字符串s和一个整数k,返回旋转后的字符串。它首先处理k大于字符串长度的情况,然后通过两次反转来实现字符串的旋转。
相关问题
字符串逆序python代码
以下是两种Python字符串逆序输出的方法:
1. 使用切片操作符[::-1]来实现字符串逆序输出:
```python
string = "Hello, World!"
reversed_string = string[::-1]
print(reversed_string) # 输出:!dlroW ,olleH
```
2. 使用reversed()函数和join()函数来实现字符串逆序输出:
```python
string = "Hello, World!"
reversed_string = ''.join(reversed(string))
print(reversed_string) # 输出:!dlroW ,olleH
```
python:实现切分字符串 源代码
好的,以下是Python实现切分字符串的源代码示例:
```python
string = "Hello, world!"
delimiter = ", "
result = string.split(delimiter)
print(result)
```
以上代码将把字符串"Hello, world!"以", "作为分隔符进行切分,得到列表["Hello", "world!"]。
请问还有其他需要回答的问题吗?