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Uploading a Blob with Flask
mentioned on Monday,December 31,2012

Generally, Use blobstore_handlers when uploading a blob file.
Also, There is another way. For example,
an application that is using the Flask,
You can be in the following way.

ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'])

def allowed_file(filename):
  return '.' in filename and \
    filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS

@app.route("/upload", methods=["POST"])
def upload():
  if request.method == "POST":
    upload_file = request.files["file"]
    image_data =
    if image_data and allowed_file(upload_file.filename):
      file_name = secure_filename(upload_file.filename)
      blob_io = files.blobstore.create(mime_type=upload_file.content_type, _blobinfo_uploaded_filename=file_name)
      with, 'a') as f:
      blob_key = files.blobstore.get_blob_key(blob_io)
      image_url = images.get_serving_url(str(blob_key))
      return redirect(url_for("result", upload_url=image_url))

Upload form

<form action="{{ url_for("upload") }}" method=post enctype="multipart/form-data">
    {% if upload_url %}<p class=uploaded>Now upload file's url:
    <input type="text" value="{{upload_url}}">(Copy&Paste this.)</p>{% endif %}
    Upload File:<input type="file" name="file"><br>
    <input type="submit" name="submit" value="Upload">


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This entry was tagged #Flask #GAE