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Python dictionary: Get list of values for list of keys
Is there a built-in/quick way to use a list of keys to a dictionary to get a list of corresponding items?
11 Answers
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Code Golf: Collatz Conjecture
Inspired by http://xkcd.com/710/ here is a code golf for it.
70 Answers
70
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Python - When to use file vs open
What's the difference between file and open in Python? When should I use which one? (Say I'm in 2.5)
6 Answers
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How can I print literal curly-brace characters in python string and also use .format on it?
... the {{ and }}:
>>> x = " {{ Hello }} {0} "
>>> print(x.format(42))
' { Hello } 42 '
Here's the relevant part of the Python documentation for format string syntax:
Format strings contain “replacement fields” surrounded by curly braces {}. Anything that is not contained i...
How to determine the encoding of text?
...on't know what charset was used. Is there a way to determine the encoding of a text file using Python? How can I detect the encoding/codepage of a text file deals with C#.
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How do I turn a python datetime into a string, with readable format date?
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The datetime class has a method strftime. The Python docs documents the different formats it accepts:
Python 2: strftime() Behavior
Python 3: strftime() Behavior
For this specific example, it would look something like:
my_datetime.strftime("%B %d, %Y")
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Django: Get list of model fields?
I've defined a User class which (ultimately) inherits from models.Model . I want to get a list of all the fields defined for this model. For example, phone_number = CharField(max_length=20) . Basically, I want to retrieve anything that inherits from the Field class.
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Format in kotlin string templates
Kotlin has an excellent feature called string templates. I really love it.
6 Answers
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`new function()` with lower case “f” in JavaScript
My colleague has been using "new function()" with a lower case "f" to define new objects in JavaScript. It seems to work well in all major browsers and it also seems to be fairly effective at hiding private variables. Here's an example:
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Wrapping StopWatch timing with a delegate or lambda?
...on, int iterations)
{
sw.Reset();
sw.Start();
for (int i = 0; i < iterations; i++)
{
action();
}
sw.Stop();
return sw.ElapsedMilliseconds;
}
}
Then call it like this:
var s = new Stopwatch();
Console.WriteLine(s.Time...