Python AssertionError: The argument passed to the write() function in GAE must be a

Currently, I am utilizing Sublime Text 2 as my primary editor to develop a brand new Google App Engine project.

UPDATE: While testing this code via localhost, I encountered an issue when accessing the app on appspot:

Status: 500 Internal Server Error Content-Type: text/plain Content-Length: 59 A server error occurred. Please contact the administrator.

The excerpt of the code causing trouble is as follows:

import webapp2 as webapp
from google.appengine.ext.webapp.util import run_wsgi_app

class IndexPage(webapp.RequestHandler):
    def get(self):
        self.response.out.write('Hello, World!')

app = webapp.WSGIApplication([('/.*', IndexPage)], debug = True)

def main():
    run_wsgi_app(app)

if __name__ == '__main__':
    main()

This snippet leads to an AssertionError:

File "C:\Python27\lib\wsgiref\handlers.py", line 202, in write

assert type(data) is StringType,"write() argument must be string"

AssertionError: write() argument must be string

I'm trying to decipher what this error signifies and what could potentially be triggering it.

Answer №1

My app.yaml file was not being correctly detected by GAE, but after resolving that issue, my problem got solved. Many thanks!

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