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Saving an Object (Data persistence)
...and therefore "human-readable". Versions > 0 are binary and the highest one available depends on what version of Python is being used. The default also depends on Python version. In Python 2 the default was Protocol version 0, but in Python 3.8.1, it's Protocol version 4. In Python 3.x the module...
Eclipse hangs at the Android SDK Content Loader
...ins configs won't load (you lose even the version control configs for each one). You should, backup the .projects folder, start eclipse, let it load, then close it, and after that, overwrite the recently generated .projects with the one you backed-up. (Taken from here: stackoverflow.com/a/22007977/...
Volatile vs. Interlocked vs. lock
...e access modifier of counter to public volatile
As other people have mentioned, this on its own isn't actually safe at all. The point of volatile is that multiple threads running on multiple CPUs can and will cache data and re-order instructions.
If it is not volatile, and CPU A increments a value,...
Custom HTTP headers : naming conventions
... name with "X-". E.g. X-Forwarded-For, X-Requested-With. This is also mentioned in a.o. section 5 of RFC 2047.
Update 1: On June 2011, the first IETF draft was posted to deprecate the recommendation of using the "X-" prefix for non-standard headers. The reason is that when non-standard headers pr...
Why am I getting 'Assembly '*.dll' must be strong signed in order to be marked as a prerequisite.'?
... NuGet it's easy to get into this situation if:
You install a package to one project in your solution.
A new version of that package is deployed to the package source.
You install it to another project in the same solution.
This results in two projects in your solution referencing different vers...
WAMP/XAMPP is responding very slow over localhost
...rameters, expand New, and select DWORD (32-bit) Value
Enter DisabledComponents into the Name field
Double click on the new DisabledComponents value, enter ffffffff into the Value data dialog box, and click the OK button
Confirm the new registry value contains the required data.
Change y...
Syntax highlighting code with Javascript [closed]
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Surely using one which "automatically" detects the language simply puts more weight on the client's machine/browser...
– James
Oct 2 '08 at 8:42
...
GCC -fPIC option
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@Narek: the error occurs if one process wants to load more than one shared library at the same virtual address. Since libraries cannot predict what other libraries could be loaded, this problem is unavoidable with the traditional shared library concept....
git add, commit and push commands in one?
Is there any way to use these three commands in one?
32 Answers
32
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Check if OneToOneField is None in Django
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To check if the (OneToOne) relation exists or not, you can use the hasattr function:
if hasattr(request.user, 'type1profile'):
# do something
elif hasattr(request.user, 'type2profile'):
# do something else
else:
# do something el...