Question

下面是我的烧瓶代码。我正在连接到sqlite数据库，获取一些数据并制作pandas数据帧并将其转换为 CSV 并尝试将其传递给d3.js

 import sqlite3
 import pandas as pd
 from flask import *
 app = Flask(__name__)
 @app.route("/new_graph",methods = ['GET','POST'])
 def new_graph():
    connection = sqlite3.connect('recruit.db')
    query = "select * from customers"
    //bunch of dataframe calculations using pandas

    data = final_df.to_csv(sep=',')
    print (data)
    return render_template('new_display.html',data=data)

if __name__ == "__main__":
    app.run(app.run( port=8069),debug=True)

也尝试了，

@app.route("/new_graph",methods = ['GET','POST'])
def new_graph():
    if request.method == 'POST':
        connection = sqlite3.connect('recruit.db')
        query = "select * from customers"
    //bunch of dataframe calculations using pandas

        data = final_df.to_csv(sep=',')
        return data
    return render_template('new_display.html')

以下是 html ：

    <!DOCTYPE html>

<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>


d3.csv("/new_graph", function(data) {  //recommended way of passing csv 
  console.log(data[0]);
});

 </script>
</body>

当我运行它时，它运行正常并且csv被打印出来：

 127.0.0.1 - - [02/May/2017 17:52:12] "GET /new_graph HTTP/1.1" 200 -
,Home_Owners,Home_renters,Ethinicity
0,1229,24,Asian
1,9856,584,Black
2,793,11,Chinese
3,8681,351,Hispanic
4,256,6,American Indian
5,141,5,Japanese
6,23855,449,Other
7,4,0,Portuguese
8,39284,611,White

127.0.0.1 - - [02/May/2017 17:52:17] "GET /new_graph HTTP/1.1" 200 -

但是 console.log 打印出一个奇怪的输出：

  Object {<!DOCTYPE html>: ""}

无法弄清楚，我哪里出错了。

Answer 1

您将csv数据传递给模板文件。端点new_graph返回html而不是您想要的csv数据。您可以直接返回csv数据。

尝试使用烧瓶

1 个答案: