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What is the most efficient way to create a dictionary of two pandas Dataframe columns?
...1))
[out]:
[['a', 1], ['b', 2], ['c', 3], ['d', 4], ['e', 5]]
Lastly, cast the list of list of 2 elements into a dict.
dict(sorted(df.values.tolist()))
[out]:
{'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}
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Answering @sbradbio comment:
If there are multiple values for a specific ke...
Nullable vs. int? - Is there any difference?
...tions is clearly named logical. Remember, in C# there are no conversions ("casts") between bool and numeric types!
– Jeppe Stig Nielsen
Aug 14 '15 at 10:41
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What is the most efficient Java Collections library? [closed]
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As other commentators have noticed, the definition of "efficient" casts a wide net. However no one has yet mentioned the Javolution library.
Some of the highlights:
Javolution classes are fast, very fast (e.g. Text insertion/deletion in O[Log(n)] instead of O[n] for standard StringBuffe...
Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?
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"Never" is a strong word. "Money" is useful for casting results to that type for display to the user in a culture-sensitive way, but you're right that it's very bad to use for the calculations itself.
– Joel Coehoorn
Feb 24 '09 at 18:...
SAML: Why is the certificate within the Signature?
...asically:
// signedXml.KeyInfo[0].Certificates[0]
// ...but with added casting
var certificate = GetFirstX509Certificate(signedXml);
// check the key and signature match
bool isSigned = signedXml.CheckSignature(certificate, true);
That just checks that the message is from who it says it is. Y...
What does CultureInfo.InvariantCulture mean?
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Not all cultures use the same format for dates and decimal / currency values.
This will matter for you when you are converting input values (read) that are stored as strings to DateTime, float, double or decimal. It will also matter if you try to format the aforementio...
gunicorn autoreload on source change
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Thanks for the reminder. But I don't want to cast my vote on other's success. Why this (unnecessary) hurry? Am I violating some StackOverflow rule? If so please let me know how to remediate.
– Paolo
Dec 19 '13 at 19:10
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What is a serialVersionUID and why should I use it?
... read
Unnecessary code: Redundant null check
Unnecessary code: Unnecessary cast or 'instanceof'
and many more.
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Why are arrays of references illegal?
...lates).
this would probably work, if you don't mind this kind of nasty: recast '*this' as an array of int *'s and return a reference made from one: (not recommended, but it shows how the proper 'array' would work):
int & operator[]( int i ) { return *(reinterpret_cast<int**>(this)[i]); ...
Better way of getting time in milliseconds in javascript?
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The + simply cast Date to Number, giving a standard unix timestamp in milliseconds. You can explicitly get this value by calling (new Date()).getTime()
– ngryman
Apr 15 '12 at 0:28
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