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append multiple values for one key in a dictionary [duplicate]
...ith in years_dict is a dictionary that looks like the following:
{
"2010": [2],
"2009": [4,7],
"1989": [8]
}
In general, it's poor programming practice to create "parallel arrays", where items are implicitly associated with each other by having the same index rather than being proper ...
How to Detect if I'm Compiling Code with a particular Visual Studio version?
...C_VER == 1911 (Visual Studio 2017 version 15.3)
MSVC++ 14.1 _MSC_VER == 1910 (Visual Studio 2017 version 15.0)
MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015 version 14.0)
MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013 version 12.0)
MSVC++ 11.0 _MSC_VER == 1700 (Visual Studio 2012 version 11...
django admin - add custom form fields that are not part of the model
...e:
class MyModel(models.model):
field1 = models.CharField(max_length=10)
field2 = models.CharField(max_length=10)
def combined_fields(self):
return '{} {}'.format(self.field1, self.field2)
Then in the admin you can add the combined_fields() as a readonly field:
class MyMode...
Most efficient way to check for DBNull and then assign to a variable?
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edited Jan 24 '18 at 10:50
community wiki
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How to sleep for five seconds in a batch file/cmd [duplicate]
... It's cleaner and more reliable, IME, to do "ping 127.0.0.1 -n 10 > nul" - each ping waits 1s, so change the number of times to the number of seconds you wish to delay.
– Cybergibbons
Jun 8 '12 at 11:17
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How to get first N elements of a list in C#?
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I believe this answer is useful even now, 10 years and many C# versions later. For the specific case where you have a list. Especially if you are skipping many items. E.g. you have a list of one million items, and you want a slice of 5 of them, far into the list. Get...
Java - No enclosing instance of type Foo is accessible
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helloworld922helloworld922
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Java: Best way to iterate through a Collection (here ArrayList)
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The first one is useful when you need the index of the element as well. This is basically equi...
Sort hash by key, return hash in Ruby
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