Want to upload a file to directory in google appengine using python

Question

I am new to google appengine. I want to upload a file to a directory instead of storing as blob.

main.py

import cgi 
import webapp2
from google.appengine.api import users
from google.appengine.ext.webapp.template \
    import render
from os import path

class MainHandler(webapp2.RequestHandler):
    def get(self):
        context={}
        tmpl = path.join(path.dirname(__file__), 'static/html/index.html')
        self.response.out.write(render(tmpl, context))

    def post(self):
       form_data = self.request.get('file')
       file_data = form_data
       f=open('static/html/'+form_data,'w')
       f.write(file_data)
       f.close



routes=[
        (r'/', MainHandler),
        ]   
app = webapp2.WSGIApplication(routes=routes,debug=True)

index.html

> <html>
>     <head><title>test</title></head>
>     <body>hello
>        <form id="addmovieform" action="/" method="post" ENCTYPE="multipart/form-data">
>            <input type="file" name="file" >
>            <input type="submit" name="submit">
>        </form>
>     </body>
>         </html>

Error

Traceback (most recent call last): File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1536, in call rv = self.handle_exception(request, response, e) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1530, in call rv = self.router.dispatch(request, response) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1278, in default_dispatcher return route.handler_adapter(request, response) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1102, in call return handler.dispatch() File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 572, in dispatch return self.handle_exception(e, self.app.debug) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 570, in dispatch return method(*args, **kwargs) File "/Users/saravase/test/main.py", line 33, in post f=open('static/html/'+form_data,'w') File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver_import_hook.py", line 589, in init raise IOError('invalid mode: %s' % mode) IOError: invalid mode: w

please guide me ...

Why do you want to do this? There's absolutely nothing special about storing data in the filesystem - practically anything you could do by writing a file you can do with StringIO or the blobstore. — Nick Johnson

Dan Holevoet Dan Holevoet · Accepted Answer · 2012-07-24T18:29:40

From "What is Google App Engine?"

Applications cannot write to the file system in any of the runtime environments. An application can read files, but only files uploaded with the application code. The app must use the App Engine datastore, memcache or other services for all data that persists between requests. The Python 2.7 environment allows bytecode to be read, written, and modified.

You'll need to return to using the blobstore, or try the Google Cloud Storage API, depending on the needs of your application.

Want to upload a file to directory in google appengine using python

1 Answers