angularjs - How to send csv from angular to flask and load into pandas? -

i trying post csv file client server , load file pandas. error ioerror: expected file path name or file-like object, got type

i tried sending same file same url through postman , there no error. think there problem how angular sends file or how appended formdata.

app.py

from flask import flask, render_template, request, send_from_directory minimongo import model, configure import pandas import csv  app = flask(__name__)  configure(host="xx.xx.com", port=xx, username="xx", password="xx")  class placement(model):     class meta:         database= "flask_api"         collection = "placements"  @app.route('/') def index():     return render_template("index.html")  @app.route('/<path:path>') def send_static(path):     return send_from_directory('static', path)  @app.route('/receive_form', methods=['get', 'post']) def receive_form():     instance = placement()     instance.x = "test"     instance.save()     df = pandas.read_csv(request.files.get("csv"))     return "200"  if __name__ == '__main__':     app.run(debug=true) 

app.js

angular.module("negatizer", ['ngroute'])  .service("getjson", function($http){   this.getjson = function(callback){     $http.get("/mock/data.json").then(callback)   } }) .service("postformdata", function($http){   this.postformdata = function(data, callback){     console.log("service")     $http.post("/receive_form", data).then(callback)   } })   .controller("mainctrl", function($scope, $window, getjson, postformdata){   $scope.filechanged = function(element) {     var form = new formdata()     form.append("csv", element.files[0])     postformdata.postformdata(form, function() {       console.log("i sent the form")     })   }    getjson.getjson(function(response) {     console.log(response.data)     $scope.varname = response.data   }) })   .config(function ($routeprovider) {     $routeprovider     .when("/", {         controller: "mainctrl",         templateurl: "partials/home.html"     })     .otherwise({         redirectto: "/mock/data.json"     }); }); 

the form in index.html

<form action="/" enctype="multipart/form-data" id="form" method="post">   <span id="upload">   upload automatic placements<input ng-model="photo" onchange="angular.element(this).scope().filechanged(this)" type="file" name="csv">   </span> </form> 

traceback

traceback (most recent call last):   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__     return self.wsgi_app(environ, start_response)   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app     response = self.make_response(self.handle_exception(e))   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception     reraise(exc_type, exc_value, tb)   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app     response = self.full_dispatch_request()   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request     rv = self.handle_user_exception(e)   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception     reraise(exc_type, exc_value, tb)   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request     rv = self.dispatch_request()   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request     return self.view_functions[rule.endpoint](**req.view_args)   file "/users/student/documents/flask_projects/neg_app/app.py", line 28, in receive_form     df = pandas.read_csv(request.form.get("csv"))   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/pandas/io/parsers.py", line 498, in parser_f     return _read(filepath_or_buffer, kwds)   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/pandas/io/parsers.py", line 275, in _read     parser = textfilereader(filepath_or_buffer, **kwds)   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/pandas/io/parsers.py", line 590, in __init__     self._make_engine(self.engine)   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/pandas/io/parsers.py", line 731, in _make_engine     self._engine = cparserwrapper(self.f, **self.options)   file "/library/frameworks/python.framework/versions/2.7/lib/python2.7/site-packages/pandas/io/parsers.py", line 1103, in __init__     self._reader = _parser.textreader(src, **kwds)   file "pandas/parser.pyx", line 353, in pandas.parser.textreader.__cinit__ (pandas/parser.c:3246)    file "pandas/parser.pyx", line 608, in pandas.parser.textreader._setup_parser_source (pandas/parser.c:6288)  ioerror: expected file path name or file-like object, got <type 'nonetype'> type