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Why were pandas merges in python faster than data.table merges in R in 2012?
... coerce character to
factor. Factors are still supported. Implements FR#1493, FR#1224
and (partially) FR#951.
New functions chmatch() and %chin%, faster versions of match()
and %in% for character vectors. R's internal string cache is
utilised (no hash table is built). They are about 4 times faster
t...
How to encode URL parameters?
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173
With PHP
echo urlencode("http://www.image.com/?username=unknown&password=unknown");
Resul...
Permanently adding a file path to sys.path in Python
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tuomassalo
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answered Sep 4 '12 at 6:20
BrenBarnBrenBarn
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How to: Define theme (style) item for custom widget
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edited Jul 9 '13 at 20:09
Dan Hulme
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a...
jQuery: keyPress Backspace won't fire?
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330
Use keyup instead of keypress. This gets all the key codes when the user presses something
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AngularJS : What is a factory?
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edited May 23 '17 at 11:55
Community♦
111 silver badge
answered May 16 '13 at 20:12
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Should the .gradle folder be added to version control?
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edited Dec 18 '17 at 4:33
answered Jun 21 '13 at 23:41
S...
foldl versus foldr behavior with infinite lists
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234
How folds differ seems to be a frequent source of confusion, so here's a more general overview:...
Change one value based on another value in pandas
...for you.
import pandas
df = pandas.read_csv("test.csv")
df.loc[df.ID == 103, 'FirstName'] = "Matt"
df.loc[df.ID == 103, 'LastName'] = "Jones"
As mentioned in the comments, you can also do the assignment to both columns in one shot:
df.loc[df.ID == 103, ['FirstName', 'LastName']] = 'Matt', 'Jones...