Question

我正在运行一个对象检测模型（Darknet Yolov4），并将其输出通过管道传输到 results.json 文件。但是，每次我在 "filename" 字段中运行它时，都会使用一个反冲，python 将其视为转义字符。有人知道我如何解决这个问题吗？

我正在运行的命令行代码：

 cmd = f"darknet.exe detector test cfg/obj.data cfg/yolov4_test.cfg custom-yolov4-detector_best.weights -dont_show -ext_output -out result.json {path}"

Json 文件：

[
{
 "frame_id":1, 
 "filename":"C:\\Yolo_v4\\darknet\\build\darknet\\x64\\f047.png", 
 "objects": [ 
  {"class_id":32, "name":"right", "relative_coordinates":{"center_x":0.831927, "center_y":0.202225, "width":0.418463, "height":0.034752}, "confidence":0.976091}, 
  {"class_id":19, "name":"h", "relative_coordinates":{"center_x":0.014761, "center_y":0.873551, "width":0.041723, "height":0.070544}, "confidence":0.484339}, 
  {"class_id":24, "name":"left", "relative_coordinates":{"center_x":0.285694, "center_y":0.200752, "width":0.619584, "height":0.032149}, "confidence":0.646595}, 
  {"class_id":11, "name":"a", "relative_coordinates":{"center_x":0.094595, "center_y":0.488480, "width":0.089853, "height":0.046685}, "confidence":0.978590}, 
  {"class_id":12, "name":"b", "relative_coordinates":{"center_x":0.075972, "center_y":0.534347, "width":0.096545, "height":0.043278}, "confidence":0.930176}, 
 ] 
}
]

Python 代码（用于识别

def identify(path):
    cmd = f"darknet.exe detector test cfg/obj.data cfg/yolov4_test.cfg custom-yolov4-detector_best.weights -dont_show -ext_output -out result.json {path}"
    # cmd = f"darknet.exe detector test cfg/obj.data cfg/yolov4-tiny-custom.cfg custom-yolov4-tiny-detector_best.weights -ext_output -out result.json {path}"
    
    os.chdir(r'C:\Yolo_v4\darknet\build\darknet\x64')    
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
    out = p.stdout.read()
    print(out)

identify(r'C:\\Yolo_v4\\darknet\\build\darknet\\x64\\f047.png')

Answer 1

反斜杠useEffect 本身在 JSON 中，它被视为转义字符，与其他字符一样。因此，这些必须以特定方式编写在字符串中使用：

在您的情况下，反斜杠必须替换为 (\)

在您的代码中，在以下行：

\\

在 "C:\\Yolo_v4\\darknet\\build\darknet\\x64\\f047.png" 处，您只使用了一个反斜杠，因此 JSON 将其视为字符转义。

正确的代码应该是：

build\darknet

另请参阅 how other special characthers are escaped in strings（它也是用于进行 JSON 转义测试的在线工具）。

反斜杠被视为转义字符 Python/Json

1 个答案: