Python 只获取 json 中的特定值

Question

I am using the google vision api on python to get text on images, the api returns this json text:

text_annotations {
  locale: "en"
  description: "SPEED\n"
  bounding_poly {
    vertices {
      x: 6
      y: 60
    }
    vertices {
      x: 151
      y: 60
    }
    vertices {
      x: 151
      y: 117
    }
    vertices {
      x: 6
      y: 117
    }
  }
}
text_annotations {
  description: "SPEED"
  bounding_poly {
    vertices {
      x: 6
      y: 60
    }
    vertices {
      x: 151
      y: 60
    }
    vertices {
      x: 151
      y: 117
    }
    vertices {
      x: 6
      y: 117
    }
  }
}

How do I only get the description: value?

I have been trying: esp = response['description']

But it returns:

Traceback (most recent call last):
  File "C:\Users\fkahd\PycharmProjects\username\ai2.py", line 27, in <module>
    resp = response['description']
TypeError: 'AnnotateImageResponse' object is not subscriptable

Full code:

import io
import os
import json

# Imports the Google Cloud client library
from google.cloud import vision

os.environ['GOOGLE_APPLICATION_CREDENTIALS'] = r"C:\Users\fkahd\OneDrive\Bureau\zefoy\vision-apixxxxxxxxxxxx.json"

# Instantiates a client
client = vision.ImageAnnotatorClient()

# The name of the image file to annotate
file_name = os.path.abspath(r"C:\Users\fkahd\OneDrive\Bureau\zefoy\captchas\captcha(22).png")

# Loads the image into memory
with io.open(file_name, 'rb') as image_file:
    content = image_file.read()

image = vision.Image(content=content)

# Performs label detection on the image file
response = client.text_detection(image=image)  # returns TextAnnotation
resp = response['description']

Answer 1

I got the text wanted by adding:

print(response.text_annotations[0].description)

thanks for your "help"

Answer 2

JSON filed in python are similarly interpreted as dictionaries and you can get the value of 'description' in the similar manner. Here's what you have to do:

var_name = file_name['description']

The file_name is supposed to be the name of the opened json file.