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Extract elements of list at odd positions
...ust a notation for list slicing. Usually it is in the following form:
some_list[start:stop:step]
If we omitted start, the default (0) would be used. So the first element (at position 0, because the indexes are 0-based) would be selected. In this case the second element will be selected.
Because ...
How to 'bulk update' with Django?
...
Update:
Django 2.2 version now has a bulk_update.
Old answer:
Refer to the following django documentation section
Updating multiple objects at once
In short you should be able to use:
ModelClass.objects.filter(name='bar').update(name="foo")
You can also ...
How to link godaddy domain with AWS Elastic Beanstalk environment?
...EB domain (e.g. awseb-xyz.us-east-1.elb.amazonaws.com) (with masking)
In order to access the site without www (e.g. http://example.com), I had to set up the forwarding of the domain to the www cname. This www cname then gets forwarded to the AWS EB domain (with masking in order to keep www.example...
UnicodeDecodeError when reading CSV file in Pandas with Python
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read_csv takes an encoding option to deal with files in different formats. I mostly use read_csv('file', encoding = "ISO-8859-1"), or alternatively encoding = "utf-8" for reading, and generally utf-8 for to_csv.
You can also use...
Difference between method and function in Scala
...ethod Value is created from methods, either by postfixing an underscore (m _ is a method value corresponding to the "function declaration" (def) m), or by a process called eta-expansion, which is like an automatic cast from method to function.
That is what the specs say, so let me put this up-front...
What's the complete range for Chinese characters in Unicode?
... used in
Japanese copies of classical Chinese texts, to indicate reading order.
[\u3400-\u4DBF]
CJK Unified Ideographs Extension-A is a Unicode block containing rare
Han ideographs.
[\u4E00-\u9FCC]
CJK Unified Ideographs is a Unicode block containing the most common
CJK ideogra...
How to add a custom button state
...ableState" function, at least the solution works well as is, in my case
In order to use your custom class in a layout xml file, you will have to specify the fully qualified name (e.g. com.mydomain.mypackage.FoodButton)
You can as weel mix-up standard states (e.g. android:pressed, android:enabled, an...
Redis key naming conventions?
... option @EranH., it is the best practice to iterate keys. scan is used in order to incrementally iterate over a collection of elements.
– Kishor Pawar
May 16 '16 at 11:08
2
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There is no ViewData item of type 'IEnumerable' that has the key 'xxx'
...ntains a SelectList with the same name as your DropDownList i.e. "submarket_0", the Html helper will automatically populate your DropDownList with that data if you don't specify the 2nd parameter which in this case is the source SelectList.
What happened with my error was:
Because the table contai...
Adding an identity to an existing column
...column of a of a 2.5 billion row table from IDENTITY to a non-IDENTITY (in order to run a multi-hour query whose query plan worked better for non-IDENTITY columns), and then restored the IDENTITY setting, again in less than 5 seconds.
Here's a code sample of how it works.
CREATE TABLE Test
(
...