从Flask框架编写CSV

Question

在Flask框架之外编写CSV没有问题.但是当我尝试从Flask写入它时,它会写入CSV,但只能在一行上写入.

这是我正在关注的模板

@app.route('/download')
def download():
    csv = """"REVIEW_DATE","AUTHOR","ISBN","DISCOUNTED_PRICE"
"1985/01/21","Douglas Adams",0345391802,5.95
"1990/01/12","Douglas Hofstadter",0465026567,9.95
"1998/07/15","Timothy ""The Parser"" Campbell",0968411304,18.99
"1999/12/03","Richard Friedman",0060630353,5.95
"2004/10/04","Randel Helms",0879755725,4.50"""
    response = make_response(csv)
    response.headers["Content-Disposition"] = "attachment; filename=books.csv"
    return response

这完全可以写入CSV,但是当我尝试使用我的代码时,我会得到一个长行.

我的代码:

@app.route('/download')
def post(self):

    # lots of code

    csvList.append([all,my,data,goes,here])

    csvList = str(re.sub('\[|\]','',str(csvList)))  # convert to a string; remove brackets

    response = make_response(csvList)
    response.headers['Content-Disposition'] = "attachment; filename=myCSV.csv"
    return response

我的输出:

Nashville Physician Service Ce,Treasury Specialist,Brentwood,TN,(615) 507-1646,La Petite Academy,Afternoon Teacher Aide,Goodlettsville,TN,(615) 859-2034,Nashville Physician Service Ce,Denial Resolution Specialist,Brentwood,TN,(615) 507-1646

谢谢.

编辑:我尝试了所有的答案,他们在大多数情况下工作,但我选择了vectorfrog,因为它符合我想要完成的任务.

Answer 1

我最近做了类似的事情,我发现我需要首先将csv放入StringIO然后返回StringIO.如果你想要csv下载,这就是我做的:

import StringIO
import csv
from flask import make_response

@app.route('/download')
def post(self):
    si = StringIO.StringIO()
    cw = csv.writer(si)
    cw.writerows(csvList)
    output = make_response(si.getvalue())
    output.headers["Content-Disposition"] = "attachment; filename=export.csv"
    output.headers["Content-type"] = "text/csv"
    return output

Answer 2

一种选择：：

from flask import Flask, make_response
import pyexcel as pe
import StringIO # py2.7, for python3, please use import io

app = Flask(__name__)

data = [
    ["REVIEW_DATE","AUTHOR","ISBN","DISCOUNTED_PRICE"],
    ["1985/01/21","Douglas Adams",'0345391802',5.95],
    ["1990/01/12","Douglas Hofstadter",'0465026567',9.95],
    ["1998/07/15","Timothy \"The Parser\" Campbell",'0968411304',18.99],
    ["1999/12/03","Richard Friedman",'0060630353',5.95],
    ["2004/10/04","Randel Helms",'0879755725',4.50]
]

@app.route('/download')
def download():
    sheet = pe.Sheet(data)
    io = StringIO.StringIO()
    sheet.save_to_memory("csv", io)
    output = make_response(io.getvalue())
    output.headers["Content-Disposition"] = "attachment; filename=export.csv"
    output.headers["Content-type"] = "text/csv"
    return output

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

另一种选择是使用 Flask-Excel：

from flask import Flask, make_response
from flask.ext import excel

app = Flask(__name__)

data = [
    ["REVIEW_DATE","AUTHOR","ISBN","DISCOUNTED_PRICE"],
    ["1985/01/21","Douglas Adams",'0345391802',5.95],
    ["1990/01/12","Douglas Hofstadter",'0465026567',9.95],
    ["1998/07/15","Timothy \"The Parser\" Campbell",'0968411304',18.99],
    ["1999/12/03","Richard Friedman",'0060630353',5.95],
    ["2004/10/04","Randel Helms",'0879755725',4.50]
]

@app.route('/download')
def download():
    output = excel.make_response_from_array(data, 'csv')
    output.headers["Content-Disposition"] = "attachment; filename=export.csv"
    output.headers["Content-type"] = "text/csv"
    return output

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

Answer 3

您需要添加换行符.无论如何,你制作csvs 的方法(打印列表并从中删除括号)并不是最好的方法.试试这个:

csvList = '\n'.join(','.join(row) for row in csvList)

或者使用csv模块:

import io, csv

dest = io.StringIO()
writer = csv.writer(dest)

for row in csvList:
    writer.writerow(row)

# Now dest is a file-like object containing your csv