[Python][工具方法]格式化文件大小，自定义小数点后位数

比较简单，直接干货，说明写在工具方法的注释里了:

# bytes 文件大小，单位：字节数bytes
# precision 小数点后位数，可以是0
def readable_file_size(bytes, precision):
    for unit in ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB']:
        if abs(bytes) < 1024.0:
            return '%s %s' % (format(bytes, '.%df' % precision), unit)
        bytes /= 1024.0
    return '%s %s' % (format(bytes, '.%df' % precision), 'Yi')

# 测试
print(readable_file_size(102401, 2))

Java版本： https://blog.terrynow.com/2021/01/10/java-human-readable-file-size/

Javascript版本：https://blog.terrynow.com/2021/01/09/javascript-human-readable-file-size/