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Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
I am working with the pandas library and I want to add two new columns to a dataframe df with n columns (n > 0).
These new columns result from the application of a function to one of the columns in the dataframe.
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Random row from Linq to Sql
What is the best (and fastest) way to retrieve a random row using Linq to SQL when I have a condition, e.g. some field must be true?
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How to check if a query string value is present via JavaScript?
...k they lead to cleaner code, since they help me avoid nested if statements and show exactly what is going on at a certain point in code. As for the stict cases, both the left hand and right hand sides will always be numbers, so what difference would switching to strict equality operators make?
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How do you append to an already existing string?
... postfix: "",
imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9....
Block Comments in a Shell Script
...fore comment
: <<'END'
bla bla
blurfl
END
echo after comment
The ' and ' around the END delimiter are important, otherwise things inside the block like for example $(command) will be parsed and executed.
For an explanation, see this and this question.
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Avoiding instanceof in Java
...ng a chain of "instanceof" operations is considered a "code smell". The standard answer is "use polymorphism". How would I do it in this case?
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ADO方式读取EXCEL数据存在致命BUG!!!!! - 更多技术 - 清泛网 - 专注C/C++及内核技术
...到VBA窗口，执行后会依次显示每个工作表表的名称：
Sub x()
Dim ExcelDB As New ADODB.Connection
Dim RS As ADODB.Recordset
Dim S As String
Set ExcelDB = New ADODB.Connection
Set RS = New Recordset
If Application.Version < 12 Then ExcelDB.Open "Provider=Micros...
Parsing HTML using Python
... BeautifulSoup object (remember, it's a tree node basically) of the first (and in this case, only) body element of the root element (in our case, html)
– Aadaam
Jul 29 '12 at 12:38
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How to get instance variables in Python?
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Every object has a __dict__ variable containing all the variables and its values in it.
Try this
&gt;&gt;&gt; hi_obj = hi()
&gt;&gt;&gt; hi_obj.__dict__.keys()
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Qt: can't find -lGL error
... edited Jul 30 '18 at 14:05
Rando Hinn
1,1151717 silver badges3232 bronze badges
answered Aug 29 '13 at 6:15
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