ehsan shirzadi ehsan shirzadi - 25 days ago 12
Python Question

'str' object is not callable,how to deal?

When I run my Python Django app, I receive an error:


'str' object is not callable


I've tried the solutions here: TypeError: 'str' object is not callable (Python), but they don't work for me. I'm trying to run the Django book sample:

view.py:

# Create your views here.
from django.http import HttpResponse
import datetime

def current_time(request):
now = datetime.datetime.now()
html = "<html><head></head><body>%s</body></html>" % str(now)
return HttpResponse(html)

def hello(request,name):
return HttpResponse("Hello django")

def what(request):
return HttpResponse("what's the problem django?")


urls.py:

from django.conf.urls import patterns, include, url
from hello_django.views import current_time,hello,what


urlpatterns = patterns('',
url(r'^time/$','current_time'),
url(r'^what/$','what'),
url(r'^hello/([a-zA-Z0-9]+)','hello'),
)


This is the URL I'm trying:
http://127.0.0.1:8000/what/
.

Stack Trace:

TypeError at /what/
'str' object is not callable
Request Method: GET
Request URL: http://127.0.0.1:8000/what/
Django Version: 1.5.1
Exception Type: TypeError
Exception Value:
'str' object is not callable
Exception Location: C:\Python27\lib\site-packages\django\core\handlers\base.py in get_response, line 115
Python Executable: C:\Python27\python.exe
Python Version: 2.7.4
Python Path:
['D:\\Developer Center\\PyCharm\\helloDjango',
'C:\\Python27\\lib\\site-packages\\pip-1.3.1-py2.7.egg',
'C:\\Python27\\lib\\site-packages\\mysql_python-1.2.4-py2.7-win32.egg',
'D:\\Developer Center\\PyCharm\\helloDjango',
'C:\\Windows\\SYSTEM32\\python27.zip',
'C:\\Python27\\DLLs',
'C:\\Python27\\lib',
'C:\\Python27\\lib\\plat-win',
'C:\\Python27\\lib\\lib-tk',
'C:\\Python27',
'C:\\Python27\\lib\\site-packages',
'C:\\Python27\\lib\\site-packages\\PIL']
Server time: Tue, 7 Jan 2014 11:44:30 +0330
Traceback Switch to copy-and-paste view

C:\Python27\lib\site-packages\django\core\handlers\base.py in get_response
response = callback(request, *callback_args, **callback_kwargs) ...
▶ Local vars

Answer

You need to give the actual view to url():

urlpatterns = patterns('',
    url(r'^time/$', current_time),
    url(r'^what/$', what),
    url(r'^hello/([a-zA-Z0-9]+)', hello),
)

Note that I removed the quotes around what and the other view functions.

You can still use strings in the url() configurations, but then you need to use a <modulename>.<viewname> syntax or name the module in the first argument to patterns() (the string), and then you also don't need to import the functions:

urlpatterns = patterns('',
    url(r'^time/$', 'hello_django.views.current_time'),
    url(r'^what/$', 'hello_django.views.what'),
    url(r'^hello/([a-zA-Z0-9]+)', 'hello_django.views.hello'),
)

or

urlpatterns = patterns('hello_django.views',
    url(r'^time/$', 'current_time'),
    url(r'^what/$', 'what'),
    url(r'^hello/([a-zA-Z0-9]+)', 'hello'),
)

See the detailed URL dispatcher documentation.

Comments