os.path解析文件

不闻不若闻之，闻之不若见之，见之不若知之，知之不若行之。——荀子《儒效篇》

常用的解析文件方法

os.path.splitext:分离文件名与扩展名

def _parse_filename(filename):　　# 解析文件名
    """Parse meta-information from given filename.

    Parameters
    ----------
    filename : str
        A VeRi image filename.

    Returns
    -------
    (int, int, str, str) | NoneType
        Returns a tuple with the following entries:

        * Unique ID of the individual in the image
        * Index of the camera which has observed the individual
        * Filename without extension
        * File extension

        Returns None if the given filename is not a valid filename.

    """
    filename_base, ext = os.path.splitext(filename)  #　分离文件名与扩展名
    if '.' in filename_base:
        # Some images have double filename extensions.
        filename_base, ext = os.path.splitext(filename_base)
    if ext != ".jpg":
        return None
    vehicle_id, cam_num, frame_idx, detection_idx = filename_base.split('_')
    return int(vehicle_id), int(cam_num[1]), filename_base, ext

os.path.join:路径拼接

os.path.join()函数：连接两个或更多的路径名组件,参数可以传入多个路径

1.如果各组件名首字母不包含’/’，则函数会自动加上
2.如果有一个组件是一个绝对路径，则在它之前的所有组件均会被舍弃
3.如果最后一个组件为空，则生成的路径以一个’/’分隔符结尾

import os

print("1:",os.path.join('aaaa','/bbbb','ccccc.txt'))

print("2:",os.path.join('/aaaa','/bbbb','/ccccc.txt'))

print("3:",os.path.join('aaaa','./bbb','ccccc.txt'))

output

1: /bbbb\ccccc.txt
2: /ccccc.txt
3: aaaa\./bbb\ccccc.txt