Object of type ndarray is not JSON serializable

今天在用Python实现前端跟后端的数据交换，结果出现了这个bug。原因就是json不认numpy的array，所以可以把psnr_list直接作为list传入，不用转为array.

  # run test and set results
            file_name = 'conditional_gan.py'
            if(os.path.getsize(save_path)==0):
                t = threading.Thread(target=run_python, args=(test_path,file_name))
                t.start()

            # read txt file, get corresponding psnr value for each generated .hdr
            psnr_list = []
            with open(os.path.join(save_path, 'psnr.txt'),'r') as f:
                while True:
                    lines = f.readline()  # 整行读取数据
                    if not lines:
                        break
                    if (lines[0] == 'b' or lines[0] == '\n'):
                        continue
                    _, E_tmp = [i for i in lines.split(':')]  # 将整行数据分割处理，如果分割符是空格，括号里就不用传入参数，如果是逗号， 则传入‘，'字符。
                    E_tmp = [i for i in E_tmp.split('\n')]
                    psnr_list.append(E_tmp[0])

            psnr_list = np.array(psnr_list) ----->改为 psnr_list = psnr_list
            f.close()

            #set values
            LDR_list = sorted(glob(os.path.join(save_path,'*LDRs.png')))
            HDR_list = sorted(glob(os.path.join(save_path, '*tonemapped.png')))
            session['LDR_list'] = LDR_list
            session['HDR_list'] = HDR_list
            session['psnr_list'] = psnr_list
            session.permanent = True
            #redirect
            return render_template('display.html')