大约有 5,476 项符合查询结果（耗时：0.0146秒） [XML]
Writing a pandas DataFrame to CSV file
...aving.
Compression is recommended if you are writing large DataFrames (>100K rows) to disk as it will result in much smaller output files.
OTOH, it will mean the write time will increase (and consequently, the
read time since the file will need to be decompressed).
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Sort hash by key, return hash in Ruby
... of tuples to convert them to a k=>v structure (hash).
hsh ={"a" => 1000, "b" => 10, "c" => 200000}
Hash[hsh.sort_by{|k,v| v}] #or hsh.sort_by{|k,v| v}.to_h
There is a similar question in "How to sort a Ruby Hash by number value?".
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jQuery Popup Bubble/Tooltip [closed]
...ip(event){
var tPosX = event.pageX - 10;
var tPosY = event.pageY - 100;
$('div.tooltip').css({'position': 'absolute', 'top': tPosY, 'left': tPosX});
};
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Difference between Eclipse Europa, Helios, Galileo
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+100 (if I could) for: "I'd prefer Eclipse to use traditional version numbers instead of code names, it would make things clearer and easier"
– oosterwal
Oct 19 '11 at 13:12
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Underscore prefix for property and method names in JavaScript
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100
JavaScript actually does support encapsulation, through a method that involves hiding members ...
try/catch + using, right syntax
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100
I prefer the second one. May as well trap errors relating to the creation of the object as wel...
Classes residing in App_Code is not accessible
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+100
Right click on the .cs file in the App_Code folder and check its properties.
Make sure the "Build Action" is set to "Compile".
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Remove NA values from a vector
...tc.)
Setting na.rm=TRUE does just what you're asking for:
d <- c(1, 100, NA, 10)
max(d, na.rm=TRUE)
If you do want to remove all of the NAs, use this idiom instead:
d <- d[!is.na(d)]
A final note: Other functions (e.g. table(), lm(), and sort()) have NA-related arguments that use diff...
One-liner to take some properties from object in ES 6
...object.
const person = {
fname: 'tom',
lname: 'jerry',
aage: 100,
}
let newPerson = {};
({fname: newPerson.fname, lname: newPerson.lname} = person);
console.log(newPerson);
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List comprehension in Ruby
...mprehensionTest < ActionController::PerformanceTest
TEST_ARRAY = (1..100).to_a
def test_map_compact
1000.times do
TEST_ARRAY.map{|x| x % 2 == 0 ? x * 3 : nil}.compact
end
end
def test_select_map
1000.times do
TEST_ARRAY.select{|x| x % 2 == 0 }.map{|x| x * 3}
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