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Access multiple elements of list knowing their index
... = pd.Series([-2, 1, 5, 3, 8, 5, 6])
b = [1, 2, 5]
c = a[b]
You can then convert c back to a list if you want:
c = list(c)
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Convert a list of objects to an array of one of the object's properties
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This should also work:
AggregateValues("hello", MyList.ConvertAll(c => c.Name).ToArray())
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parseInt(null, 24) === 23… wait, what?
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It's converting null to the string "null" and trying to convert it. For radixes 0 through 23, there are no numerals it can convert, so it returns NaN. At 24, "n", the 14th letter, is added to the numeral system. At 31, "u", the 21...
sqlite database default time value 'now'
... the timestamp (created_at-column) is saved as unix epoch UTC timezone and converted to local timezone only when necessary.
Using unix epoch saves storage space - 4 bytes integer vs. 24 bytes string when stored as ISO8601 string, see datatypes. If 4 bytes is not enough that can be increased to 6 or...
Compare two objects' properties to find differences?
... How to get the difference of two sets?
The fastest way I've found is to convert the sets to dictionaries first, then diff 'em. Here's a generic approach:
static IEnumerable<T> DictionaryDiff<K, T>(Dictionary<K, T> d1, Dictionary<K, T> d2)
{
return from x in d1 where...
Replacing Pandas or Numpy Nan with a None to use with MysqlDB
... out an error saying nan is not in the field list. I need to find a way to convert the 'nan' into a NoneType.
7 Answers
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How to pretty print XML from Java?
... String that contains XML? This answer already assumes that you've somehow converted the String object into another object.
– Steve McLeod
Jul 11 '18 at 20:49
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Create UIActionSheet 'otherButtons' by passing in array, not varlist
...tonAtIndex: rather than hardcoding 0 or similar stuff). Getting nasty with converting an NSArray to va_list doesn't sound like a great solution either. :-( This API is so damn ugly.
– Daniel Rinser
Aug 29 '13 at 12:36
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Mercurial for Beginners: The Definitive Practical Guide
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How do I interface with Subversion?
There are three ways:
The convert extension will clone an existing Subversion repository into a Mercurial one. It comes with Mercurial. It works roughly like this:
hg convert <Subversion URL or directory> <path to new Mercurial repository&...
What is a regular expression which will match a valid domain name without a subdomain?
...--c6h.com/ pass the validation.
Note, to use this regex, you will need to convert the domain to lower case, and also use an IDN library to ensure you encode domain names to ACE (also known as "ASCII Compatible Encoding"). One good library is GNU-Libidn.
idn(1) is the command line interface to the ...