Category Archives: PYTHON

error: command ‘cc’ failed with exit status 1; Can’t install PIL, Pillow, MySql and other packages in Mavericks.

If you are getting the following error when installing python packages using PIP or easy_install, don’t worry. You have come to the right place for solution. First make sure you have developer tools installed. You can install them by executing the … Continue reading

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Djnago | Set the defulat ordering rule for queries in the models

Though we can specify order explicitly in queries like below Posts.objects.order_by(‘published’) it is repetitive and most of the times we will want to order by a particular field. We can specify the order in the models like this class Post(models.Model): … Continue reading

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Restrict Django Templates From Deleting Data.

Django allows method calls inside template system. Though this is an useful feature, some of the methods will have side effects. Mostly the ones that alter data. Say, for instance, you have a UserAccount object that has a delete() method. … Continue reading

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What do Dollar and Caret ( $ and ^) sign in Django urls mean?

$ and ^ are regular expression characters that have a special meaning: the caret means “require that the pattern matches the start of the string,” and the dollar sign means “require that the pattern matches the end of the string.” … Continue reading

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Mongod error | exception in initAndListen std::exception: locale::facet::_S_create_c_locale name not valid

I got this error while trying to start mongodb on amazon ec2. Running this command in the terminal solved the problem. export LC_ALL=C I don’t have any idea about what it means at this time except that it sets the … Continue reading

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Right way to break Django code for debugguing

Django traceback is a very helpful tool in Django development. It saves us from the boring tasking of writing print statements to track variables. Traceback doesn’t kick when there is no error.  There may be no coding errors but there … Continue reading

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Where are python site packages located in MAC OSX Mountain Lion

Python site packages are located at Library/Python/2.7/site-packages

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Error whil creating super user in django1.4 on MAC

I got the following error while trying to create a super user from shell for django1.4. File “/Library/Python/2.7/site-packages/django/contrib/auth/management/__init__.py”, line 85, in get_system_username     return getpass.getuser().decode(locale.getdefaultlocale()[1]) TypeError: decode() argument 1 must be string, not None This problem was rectified by running … Continue reading

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