git clone https://github.com/jsyqrt/zhihu.git

cd zhihu
pip3 install -r requirements.txt

vi zhihu/spiders/zhihutopic.py # to edit the zhihutopic.py file to specify your account 
                     # info ( email and password ) of zhihu.com.

# you can add more topic codes to the "__topic_codes" field.
# example code "19551275" is the code of topic "人工智能" as my interviewer asked, 
# [愿景學城](http://www.ouraivision.com/).

scrapy crawl zhihutopic # to crawl zhihutopic with scrapy.
                        # when you are asked to input the captcha code, 
                        #just input its order number(1,...,7) without any blank.

scrapy crawl zhihutopic -o topics.json # to save results to json file.