如何在最后一次出现特定字符后删除字符串的特定部分？

def delete_after_last_occurrence(string, char):
    last_index = string.rfind(char)  # 获取最后一次出现特定字符的索引
    if last_index != -1:  # 如果存在该字符
        string = string[:last_index]  # 删除特定部分
    return string

# 示例调用
my_string = "Hello World, Hello Universe, Hello Galaxy"
my_char = ","
result = delete_after_last_occurrence(my_string, my_char)
print(result)