Python Flask Upload File Test Example

Flask file upload code

import os
from flask import Flask, request, redirect, url_for, send_from_directory
from  import secure_filename
UPLOAD_FOLDER = '/tmp/flask-upload-test/'
ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'])
app = Flask(__name__)
['UPLOAD_FOLDER'] = UPLOAD_FOLDER
def allowed_file(filename):
    return '.' in filename and \
           ('.', 1)[1] in ALLOWED_EXTENSIONS
@('/', methods=['GET', 'POST'])
def upload_file():
    if  == 'POST':
        # check if the post request has the file part
        if 'file' not in :
            print 'no file'
            return redirect()
        file = ['file']
        # if user does not select file, browser also
        # submit a empty part without filename
        if  == '':
            print 'no filename'
            return redirect()
        if file and allowed_file():
            filename = secure_filename()
            ((['UPLOAD_FOLDER'], filename))
            return redirect(url_for('uploaded_file',
                                    filename=filename))
    return '''
    <!doctype html>
    <title>Upload new File</title>
    <h1>Upload new File</h1>
    <form action="" method=post enctype=multipart/form-data>
      <p><input type=file name=file>
         <input type=submit value=Upload>
    </form>
    '''
@('/uploads/<filename>')
def uploaded_file(filename):
    return send_from_directory(['UPLOAD_FOLDER'],
                               filename)
if __name__ == "__main__":
    (debug=True)

Upload Test

$ curl -F 'file=@"";filename=""' 127.0.0.1:5000

Note: When using the upload file function use POST form-data, the parameter name is the name of the parameter (which is usually agreed upon in advance, not a changed filename), and the value of the parameter is a file (which normally has a filename).

Uploading temporary files

Sometimes the script generates a file to be uploaded, but there is no need to leave it locally, so it uses a temporary file and uploads it directly when it is generated successfully.

Using tempfile

tempfile creates a file in the system's temporary directory and automatically deletes it after use.

import requests
import tempfile
url = 'http://127.0.0.1:5000'
temp = (mode='w+', suffix='.txt')
try:
    ('Hello Temp!')
    (0)
    files = {'file': temp}
    r = (url, files=files, proxies=proxies)
finally:
    # Automatically cleans up the file
    ()

Using StringIO

Or just use StringIO, which can do the whole thing directly in memory.

import requests
from StringIO import StringIO
url = 'http://127.0.0.1:5000'
temp = StringIO()
('Hello Temp!')
(0)
 = ''    # StringIO instances don't have filenames, you need to set them manually, if you don't, the filename will be 'file' when you POST it.
files = {'file': temp}
r = (url, files=files)

(sth. or sb) else

Adding a piece of code found that allows you to upload multiple attachments with the same name:

files = [
    ("attachments", (display_filename_1, open(filename1, 'rb'),'application/octet-stream')),
    ("attachments", (display_filename_2, open(filename2, 'rb'),'application/octet-stream'))
]
r = (url, files=files, data=params)

consultation

10.6. tempfile — Generate temporary files and directories — Python 2.7.12 documentation

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