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select and update database record with a single queryset
...ew value based on the old field value that is do something like:
update my_table set field_1 = field_1 + 1 where pk_field = some_value
use query expressions:
MyModel.objects.filter(pk=some_value).update(field1=F('field1') + 1)
This will execute update atomically that is using one update request to...
Convert list of dictionaries to a pandas DataFrame
...ecord_path arguments, check out the documentation.
##Summarising
Here's a table of all the methods discussed above, along with supported features/functionality.
* Use orient='columns' and then transpose to get the same effect as orient='index'.
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What is the difference between a .xib file and a .storyboard?
... http://www.appcoda.com/use-storyboards-to-build-navigation-controller-and-table-view/
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How to unmount a busy device
...le users daily. I already have code to recognize shared drives (from a SQL table) and mount them in a special directory where all users can access them.
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How to maintain a Unique List in Java?
...mathematical set abstraction.
Note: Great care must be exercised if mutable objects are used as set elements. The behavior of a set is not specified if the value of an object is changed in a manner that affects equals comparisons while the object is an element in the set. A special case of this...
How to turn on/off ReactJS 'development mode'?
...ing the minified react will leave all those potential optimizations on the table as well.
Ultimately the magic comes down to React embedding references to process.env.NODE_ENV throughout the codebase; these act like a feature toggle.
if (process.env.NODE_ENV !== "production")
// do propType checks...
How to handle click event in Button Column in Datagridview?
... using this exact example for a dgv with two columns. One column that's editable and the 2nd with a remove buttton. I click all over the dgv and the event only fires off when I click on the button.
– Luminous
Aug 22 '14 at 14:04
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How to exclude a file extension from IntelliJ IDEA search?
...Nov 28 '18 at 15:37
Robert DROP TABLE STUDENTS
14011 silver badge1010 bronze badges
answered Mar 3 '14 at 10:35
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Which Java Collection should I use?
...resenting a Collection with no duplicates.
HashSet: A Set backed by a Hashtable. Fastest and smallest memory usage, when ordering is unimportant.
LinkedHashSet: A HashSet with the addition of a linked list to associate elements in insertion order. The "next" element is the next-most-recently insert...
What is DOCTYPE?
...s NOT defined by the DTD!
For example, a doctype could define how the <table>-tag can look like - which attributes it accepts, and which values/valuetypes are accepted for each attribute. Think of it as a lexicon for your current webpage.
Wikipedia has an informative page on the various Doct...