Python中的字符串切割和拼接方法的性能比较和最佳实践是什么？

import timedef split_test():    s = "This is a test string"    for i in range(10000):        s.split()def slice_test():    s = "This is a test string"    for i in range(10000):        s[:].split()start_time = time.time()split_test()end_time = time.time()print("split()方法耗时：", end_time - start_time)start_time = time.time()slice_test()end_time = time.time()print("切片操作耗时：", end_time - start_time)

import timedef plus_operator_test():    s = ""    for i in range(10000):        s += str(i)def join_test():    s = ""    strings = [str(i) for i in range(10000)]    s.join(strings)start_time = time.time()plus_operator_test()end_time = time.time()print("+号运算符耗时：", end_time - start_time)start_time = time.time()join_test()end_time = time.time()print("join()函数耗时：", end_time - start_time)