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Understanding slice notation
I need a good em>x m>planation (references are a plus) on Python's slice notation.
33 Answers
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Convert number strings with commas in pandas DataFrame to float
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But this works: df.apply(lambda m>x m>: m>x m>.str.replace(',', '').astype(float), am>x m>is=1)
– krassowski
Nov 21 '19 at 16:03
add a comment
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SELECT DISTINCT on one column
...DISTINCT [ID] = ( SELECT TOP 1 [ID] FROM @TestData Y WHERE Y.[Product] = m>X m>.[Product])
,[SKU]= ( SELECT TOP 1 [SKU] FROM @TestData Y WHERE Y.[Product] = m>X m>.[Product])
,[PRODUCT]
FROM @TestData m>X m>
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What does the constant 0.0039215689 represent?
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0.0039215689 is approm>x m>imately equal to 1/255.
Seeing that this is OpenGL, performance is probably important. So it's probably safe to guess that this was done for performance reasons.
Multiplying by the reciprocal is faster than repeatedly divi...
Create an empty object in JavaScript with {} or new Object()?
...le.
For defining empty objects they're technically the same. The {} syntam>x m> is shorter, neater (less Java-ish), and allows you to instantly populate the object inline - like so:
var myObject = {
title: 'Frog',
url: '/img/picture.jpg',
width: 300,
height: 200
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cd into directory without having permission
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@user812954's answer was quite helpful, em>x m>cept I had to do this this in two steps:
sudo su
cd directory
Then, to em>x m>it out of "super user" mode, just type em>x m>it.
share
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Flatten nested dictionaries, compressing keys
...lly the same way you would flatten a nested list, you just have to do the em>x m>tra work for iterating the dict by key/value, creating new keys for your new dictionary and creating the dictionary at final step.
import collections
def flatten(d, parent_key='', sep='_'):
items = []
for k, v in d...
Escaping regem>x m> string
I want to use input from a user as a regem>x m> pattern for a search over some tem>x m>t. It works, but how I can handle cases where user puts characters that have meaning in regem>x m>?
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How to add and get Header values in WebApi
... No. The headers.GetValues("somethingNotFound") throws an InvalidOperationEm>x m>ception.
– Aidanapword
Jun 9 '16 at 9:42
D...
RuntimeWarning: invalid value encountered in divide
... would one want to ignore a divide by zero or NaN?
– m>x m> squared
Nov 10 '17 at 14:38
7
@m>x m>squared Wh...