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Change one value based on another value in pandas
... solution (it is explicitly discouraged in the docs), but it is useful to know about:
import pandas
df = pandas.read_csv("test.csv")
df['FirstName'][df.ID == 103] = "Matt"
df['LastName'][df.ID == 103] = "Jones"
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SVN Repository Search [closed]
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OpenGrok has moved to opengrok.github.io/OpenGrok now.
– alanc
May 14 '13 at 2:02
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UML class diagram enum
...in UML, so typically Associations aren't shown any more than they would be if you declared an attribute to be of type Integer. If your modeling tool has explicit support for enumerations, you should use that and only use the Class + <<enumeration>> stereotype notation as a fallback if n...
Split array into chunks
...onsole.log(
[1, 2, 3, 4, 5, 6, 7].chunk(3)
)
My preferred way nowadays is the above, or one of the following:
Array.range = function(n) {
// Array.range(5) --> [0,1,2,3,4]
return Array.apply(null,Array(n)).map((x,i) => i)
};
Object.defineProperty(Array.prototype, 'chunk', {
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Split string on the first white space occurrence
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Late to the game, I know but there seems to be a very simple way to do this:
const str = "72 tocirah sneab";
const arr = str.split(/ (.*)/);
console.log(arr);
This will leave arr[0] with "72" and arr[1] with "tocirah sneab". Note th...
Compare two DataFrames and output their differences side-by-side
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df_final = df_all.swaplevel(axis='columns')[df.columns[1:]]
df_final
Now, its much easier to spot the differences in the frames. But, we can go further and use the style property to highlight the cells that are different. We define a custom function to do this which you can see in this part of...
How do I expand the output display to see more columns of a pandas DataFrame?
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Nowadays options can also be set as assignments to attributes of pd.options, e.g. pd.options.display.max_rows = 999
– unutbu
Jun 7 '15 at 0:19
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LINQ - Full Outer Join
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I don't know if this covers all cases, logically it seems correct. The idea is to take a left outer join and right outer join then take the union of the results.
var firstNames = new[]
{
new { ID = 1, Name = "John" },
new { I...
Why use def main()? [duplicate]
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Without the main sentinel, the code would be executed even if the script were imported as a module.
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Difference between applicationContext.xml and spring-servlet.xml in Spring Framework
...antiation order is: the root (application context), then FrameworkServlet.
Now it should be clear why they are important in which scenario.
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