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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
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10 Answers
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Google Maps API v3: How do I dynamically change the marker icon?
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182
Call the marker.setIcon('newImage.png')... Look here for the docs.
Are you asking about the a...
What is the preferred syntax for initializing a dict: curly brace literals {} or the dict() function
...e keys are valid Python identifiers.
This works:
a = {'import': 'trade', 1: 7.8}
a = dict({'import': 'trade', 1: 7.8})
This won't work:
a = dict(import='trade', 1=7.8)
>> SyntaxError: invalid syntax ^
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Return index of greatest value in an array
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How can I convert spaces to tabs in Vim or Linux?
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318
Using Vim to expand all leading spaces (wider than 'tabstop'), you were right to use retab but ...
Creating a zero-filled pandas data frame
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140
You can try this:
d = pd.DataFrame(0, index=np.arange(len(data)), columns=feature_list)
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Retrieving the last record in each group - MySQL
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1021
MySQL 8.0 now supports windowing functions, like almost all popular SQL implementations. With...
Java Generate Random Number Between Two Given Values [duplicate]
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418
You could use e.g. r.nextInt(101)
For a more generic "in between two numbers" use:
Random r =...
Take the content of a list and append it to another list
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You probably want
list2.extend(list1)
instead of
list2.append(list1)
Here's the difference:
>>> a = range(5)
>>> b = range(3)
>>> c = range(2)
>>> b.append(a)
>>> b
[0, 1, 2, [0, 1, 2, 3, 4]]
>>> c.ex...
How do I test if a variable is a number in Bash?
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