将路径名写入文件（Python）

我正在处理大量图像，并试图搜索JPEG，然后将其路径写入文件

目前，我可以找到所有我想要的JPEG。但是，我的“索引”文件中的每个新路径都会覆盖最后一个路径。因此，它根本不是一个索引/列表，而是一个包含/path/to/just/one/file.jpg的文本文件

我简化了我的代码，并在下面添加了它。这是冗长的，但这对我的阅读有益，也对像我这样的新手有益

#----------
#-->Import Modules

#I'm pretty sure there is redundancy here and it's not well laid out
#but I'm new to coding and it works

import os
import pathlib

import glob, os
from pathlib import Path

import os.path
from os import path

#----------
#-->Global Vars

#Simplified example of my variables
working_dir = "/Users/myname/path/to/working dir"
records_dir = str(working_dir + "/Records")

#----------
#-->Search Location

#Define where the jpeg search is to take place
#(actually dictated via user input, Minecraft is just an example)
search_locations = ["/Users/myname/minecraft"]

#---------
#--> Search for jpgs and write their paths to a file

#define the file where the jpeg paths are to be stored,
#(I'm referring to the storage file as an index of sorts)
jpg_index = str(records_dir + "/index_for_all_jpgs")


#Its embedded in a forloop because the user can add multiple locations
for search_location in search_locations:
    #get the desired paths from the search location
    for path in Path(search_location).rglob('*.jpg'):
        #Open the index where paths are to be stored
        with open(jpg_index, 'w') as filehandle:
            #This is supposed to write each paths as a new line
            #But it doesn't work
            filehandle.writelines('%s\n' % path)

我也尝试过使用一个更简单的想法

filehandle.write(path)

还有一个更复杂的，我不完全理解

filehandle.writelines("%s\n" % path for path in search_location)

---

然而，我所做的只是以一种稍微不同的方式失败。

w选项告诉open（）方法覆盖jpg_索引文件中以前的任何内容。因为每次在写入jpeg路径之前都会调用此方法，所以只剩下最后一个。使用“a”（append）代替“w”（write），告诉open（）方法追加到文件中，而不是每次都覆盖它

例如：

for search_location in search_locations:
    for path in Path(search_location).rglob('*.jpg'):
        with open(jpg_index, 'a') as filehandle:
            filehandle.writelines('%s\n' % path)

或者，您也可以使用。。。as语句位于for循环之外。这样，jpg_索引文件将只在开始时打开和覆盖一次，而不是在其中已有信息之后

例如：

with open(jpg_index, 'w') as filehandle:
    for search_location in search_locations:
        for path in Path(search_location).rglob('*.jpg'):
            filehandle.writelines('%s\n' % path)