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How do I import the Django DoesNotExist exception?

...y of the model itself, in this case Answer. Your problem is that you are calling the get method - which raises the exception - before it is passed to assertRaises. You need to separate the arguments from the callable, as described in the unittest documentation: self.assertRaises(Answer.DoesNotExis...
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Disabling browser print options (headers, footers, margins) from page?

... As @Awe had said above, this is the solution, that is confirmed to work in Chrome!! Just make sure this is INSIDE the head tags: <head> <style media="print"> @page { size: auto; /* auto is the initial value */ margin: 0mm; /* this affect...
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Using python's eval() vs. ast.literal_eval()?

... datamap = eval(raw_input('Provide some data here: ')) means that you actually evaluate the code before you deem it to be unsafe or not. It evaluates the code as soon as the function is called. See also the dangers of eval. ast.literal_eval raises an exception if the input isn't a valid Python dat...
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What does the caret operator (^) in Python do?

...his way: 1000 # 8 (binary) 0011 # 3 (binary) ---- # APPLY XOR ('vertically') 1011 # result = 11 (binary) share | improve this answer | follow | ...
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SqlAlchemy - Filtering by Relationship Attribute

...ts = Patient.query.filter(Patient.mother.has(phenoscore=10)) or join (usually faster): patients = Patient.query.join(Patient.mother, aliased=True)\ .filter_by(phenoscore=10) share | ...
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What does [:] mean?

...he type of population. If population is a list, this line will create a shallow copy of the list. For an object of type tuple or a str, it will do nothing (the line will do the same without [:]), and for a (say) NumPy array, it will create a new view to the same data. ...
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Django ManyToMany filter()

...nes__in=[zone1, zone2, zone3]) The double underscore (__) syntax is used all over the place when working with querysets. share | improve this answer | follow ...
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How can I create a copy of an object in Python?

...would like to create a copy of an object. I want the new object to possess all properties of the old object (values of the fields). But I want to have independent objects. So, if I change values of the fields of the new object, the old object should not be affected by that. ...
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What is your most productive shortcut with Vim?

...iles # system settings set lazyredraw # no redraws in macros set confirm # get a dialog when :q, :w, or :wq fails set nobackup # no backup~ files. set viminfo='20,\"500 # remember copy registers after quitting in the .viminfo file -- 20 jump links, regs up to 500 l...
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Autoincrement VersionCode with gradle extra properties

... I can now confirm this was not the root cause. My apologies. – Chisko Apr 9 '17 at 15:51 1 ...