Question

我的pandas数据框有数千列，我想计算新列＆＃39; future_calcs＆＃39;，它将包含字符串 - 列的名称，这些列按其值排序并用逗号分隔。此列的内容将用于其他计算。由于大量的列我想在熊猫级别上进行所有计算。

df = pd.DataFrame(np.random.randint(100, size=(4,3)), columns['aaa','bbb','ccc'])

   aaa  bbb  ccc
0   70   27   32
1   15   27   4
2   51   17   37
3   95   27   88

我想要

   aaa  bbb  ccc  future_calcs
0   70   27   32  aaa,ccc,bbb          <---  aaa > ccc > bbb
1   15   27   4   bbb,aaa,ccc
2   51   17   37  aaa,ccc,bbb
3   95   27   88  aaa,ccc,bbb

Answer 1

您可以使用numpy.argsort作为列名：

var express = require('express');
var mongoose = require('mongoose');
var bodyParser = require('body-parser');
var foodtr = require('./../model/foodtruck');

var foodtrucklist = function(req, res) {
    foodtr.find().populate('item_list').exec(function(err, foodtrucks) {
        foodtrucks.forEach(function(ftr) {
            var start_time = ftr.foodtruck_starting_timing;
            var end_time = ftr.foodtruck_closing_timing;
            var foodtruck_open_status = ftr.foodtruck_open_status;
            // var shut_down = ftr.foodtruck_shutdown;
            if ((start_time && end_time) &&
                (start_time.trim() != '' &&
                    end_time.trim() != '')) {
                if (inTime(start_time, end_time) &&
                    foodtruck_open_status ==0 ) {
                    ftr.foodtruck_open_status = 0;
                    ftr.save();
                } else {
                    ftr.foodtruck_open_status = 1;
                    ftr.save();
                }
            }
        })

        res.json({
            status: '200',
            message: 'foodtrucklist',
            data: foodtrucks
        });
    });
};

pandas并计算新列的值

1 个答案: