python - 错误; 字符串索引必须是整数，很确定值是整数

Question

赋值是编写一个返回字符串后半部分的代码。得到一个错误说索引必须是整数，但我似乎无法弄清楚问题出在哪里。感谢帮助

def last_half(sent):
    string_length = len(sent)
    if string_length / 2 == 0:
        s_half = int(string_length/2)
        print(sent[s_half,-1])
    elif string_length / 2 != 0:
        s_half = int(round(string_length/2))
        print(sent[s_half,-1])

标签： pythonpython-3.xstringindices

Answer 1

您错误地使用了切片。看看https://www.pythoncentral.io/how-to-slice-listsarrays-and-tuples-in-python/

def last_half(sent):
    string_length = len(sent)
    if string_length / 2 == 0:
        s_half = int(string_length/2)
        print(sent[s_half:])
    elif string_length / 2 != 0:
        s_half = int(round(string_length/2))
        print(sent[s_half:])