我如何让一个类返回一个字符串，它是文件中指定的对象的大小？

class FileSizeReporter:
    def __init__(self, file_path):
        self.file_path = file_path

    def get_size_as_string(self):
        try:
            # 获取文件大小
            size_in_bytes = os.path.getsize(self.file_path)
            
            # 将文件大小转换为更易读的格式
            size_name = ("B", "KB", "MB", "GB", "TB")
            i = 0
            size = size_in_bytes
            while size >= 1024 and i < len(size_name) - 1:
                size /= 1024.0
                i += 1
            
            # 返回格式化的字符串
            return f"File size: {size:.2f} {size_name[i]}"
        except FileNotFoundError:
            return "File not found."
        except Exception as e:
            return f"An error occurred: {e}"

# 使用示例
file_reporter = FileSizeReporter("path/to/your/file")
print(file_reporter.get_size_as_string())

import os