遍历多行

Question

我有一个很大的文本文件，即pre.txt，我想要使用python在多行上阅读feat_left点。这是文本文件的快照。

{ 
    "outputs": { 
    "/home/113267806.jpg": { 
     "feat_left": [ 
     2.369331121444702, 
     -1.1544183492660522 
     ], 
     "feat_right": [ 
     2.2432730197906494, 
     -0.896904468536377 
     ] 
    }, 
    "/home/115061965.jpg": { 
     "feat_left": [ 
     1.8996189832687378, 
     -1.3713303804397583 
     ], 
     "feat_right": [ 
     1.908974051475525, 
     -1.4422794580459595 
     ] 
    }, 
    "/home/119306609.jpg": { 
     "feat_left": [ 
     -0.7765399217605591, 
     -1.690917730331421 
     ], 
     "feat_right": [ 
     -1.1964678764343262, 
     -1.9359161853790283 
     ] 
    }, 

Answer 1

阅读json并重复这样的，

import json 
data = json.load(open('file_name.json')) 
for val in data['outputs'].values(): 
    print(val['feat_left']) 

结果会是这样，

[-0.7765399217605591, -1.690917730331421] 
[2.369331121444702, -1.1544183492660522] 
[1.8996189832687378, -1.3713303804397583] 

编辑 您可以使用这样的图片路径，

for key,val in a['outputs'].items(): 
     print(key,val['feat_left']) 

，它会给liek这

('/home/119306609.jpg', [-0.7765399217605591, -1.690917730331421]) 
('/home/113267806.jpg', [2.369331121444702, -1.1544183492660522]) 
('/home/115061965.jpg', [1.8996189832687378, -1.3713303804397583])