Failed to parse .csv file downloaded using Flask

Question

Failed to parse .csv file downloaded using Flask

I am trying to download a CSV file, process it to get the results, and write back (upload) a new CSV file containing the result. I am very csv.readerwith Flask and cannot get the “correct” object csv.readerto iterate and work on it. Here is the code, bye

__author__ = 'shivendra'
from flask import Flask, make_response, request
import csv

app = Flask(__name__)

def transform(text_file_contents):
    return text_file_contents.replace("=", ",")


@app.route('/')
def form():
    return """
        <html>
            <body>
                <h1>Transform a file demo</h1>

                <form action="/transform" method="post" enctype="multipart/form-data">
                    <input type="file" name="data_file" />
                    <input type="submit" />
                </form>
            </body>
        </html>
    """

@app.route('/transform', methods=["POST"])
def transform_view():
    file = request.files['data_file']
    if not file:
        return "No file"

    file_contents = file.stream.read().decode("utf-8")
    csv_input = csv.reader(file_contents)
    print(file_contents)
    print(type(file_contents))
    print(csv_input)
    for row in csv_input:
        print(row)

    result = transform(file_contents)

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

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=5001, debug=True)

Terminal output

127.0.0.1 - - [12/Oct/2015 02:51:53] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [12/Oct/2015 02:51:59] "POST /transform HTTP/1.1" 200 -
4,5,6
<class 'str'>
<_csv.reader object at 0x105149438>
['1']
['', '']
['2']
['', '']
['3']
[]
['4']
['', '']
['5']
['', '']
['6']

While the file I read is

What am I doing wrong to not get 2 lists representing 2 rows when I repeat the csv.reader object?

+7

python flask csv

Shivendra Oct 11 '15 at 21:42

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1 answer

iLoveTux · Accepted Answer · 2015-10-12T00:25:13+0000

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1, csv.reader . str ,, csv.reader ( ). str, .

( ) str - . , flask.request.files["name"], . cStringIO.StringIO , , . , io.StringIO , . (, ):

__author__ = 'shivendra'
from flask import Flask, make_response, request
import io
import csv

app = Flask(__name__)

def transform(text_file_contents):
    return text_file_contents.replace("=", ",")


@app.route('/')
def form():
    return """
        <html>
            <body>
                <h1>Transform a file demo</h1>

                <form action="/transform" method="post" enctype="multipart/form-data">
                    <input type="file" name="data_file" />
                    <input type="submit" />
                </form>
            </body>
        </html>
    """

@app.route('/transform', methods=["POST"])
def transform_view():
    f = request.files['data_file']
    if not f:
        return "No file"

    stream = io.StringIO(f.stream.read().decode("UTF8"), newline=None)
    csv_input = csv.reader(stream)
    #print("file contents: ", file_contents)
    #print(type(file_contents))
    print(csv_input)
    for row in csv_input:
        print(row)

    stream.seek(0)
    result = transform(stream.read())

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

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=5001, debug=True)

Failed to parse .csv file downloaded using Flask

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