大约有 13,922 项符合查询结果（耗时：0.0244秒） [XML]
Getting a map() to return a list in Python 3.x
I'm trying to map a list into hex, and then use the list elsewhere. In python 2.6, this was easy:
9 Answers
...
Linq style “For Each” [duplicate]
Is there any Linq style syntax for "For each" operations?
6 Answers
6
...
finding and replacing elements in a list
... edited Jan 31 '18 at 13:46
Maximilian Peters
21.7k77 gold badges5353 silver badges7070 bronze badges
answered Apr 6 '10 at 1:41
...
How to validate an email address using a regular expression?
Over the years I have slowly developed a regular expression that validates MOST email addresses correctly, assuming they don't use an IP address as the server part.
...
How to crop an image in OpenCV using Python
...y slicing.
import cv2
img = cv2.imread("lenna.png")
crop_img = img[y:y+h, x:x+w]
cv2.imshow("cropped", crop_img)
cv2.waitKey(0)
share
|
improve this answer
|
follow
...
Annotating text on individual facet in ggplot2
I want to annotate some text on last facet of the plot with the following code:
6 Answers
...
Ternary Operator Similar To ?:
...lue a good pattern? to get
scala> "Hi".getClass.getSimpleName |> {x => x.endsWith("$") ? x.init | x}
res0: String = String
scala> List.getClass.getSimpleName |> {x => x.endsWith("$") ? x.init | x}
res1: String = List
Is this adequate for your needs?
...
Build an ASCII chart of the most commonly used words in a given text [closed]
Build an ASCII chart of the most commonly used words in a given text.
59 Answers
59
...
Maximum size of a element
I'm working with a canvas element with a height of 600 to 1000 pixels and a width of several tens or hundreds of thousands of pixels. However, after a certain number of pixels (obviously unknown), the canvas no longer display shapes I draw with JS.
...
Apply pandas function to column to create multiple new columns?
...swer, you can do the assignment in one pass using df.merge:
df.merge(df.textcol.apply(lambda s: pd.Series({'feature1':s+1, 'feature2':s-1})),
left_index=True, right_index=True)
textcol feature1 feature2
0 0.772692 1.772692 -0.227308
1 0.857210 1.857210 -0.142790
2 0.065639 1.06563...