行限制子句 - SQL Developer工具中的FETCH FIRST

Question

当我试图执行此声明时：

import io
from google.cloud import vision

vision_client = vision.Client()
#file_name = "/var/www/FlaskApp/FlaskApp/static/"#'375px-Guido_van_Rossum_OSCON_2006_cropped.png'

file_name = '1200px-Guido_van_Rossum_OSCON_2006.jpg'

#file_name = "/var/www/FlaskApp/FlaskApp/static/cyou_pic_folders/cyou_folder_2017_11_16_10_26_18/pi_pic_lc_2017_11_16_10_26_1800049.png"

with io.open(file_name, 'rb') as image_file:
    content = image_file.read()
    image = vision_client.image(
        content=content, )

labels = image.detect_labels()
for label in labels:
    print(label.description)

我收到如下错误：

  

ORA-00933：SQL命令未正确结束

我在SQL Developer（17.3.1）中执行了此操作，如果这很重要。