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pandas read_csv and filter columns with usecols
...ter reading.
This solution corrects those oddities:
import pandas as pd
from StringIO import StringIO
csv = r"""dummy,date,loc,x
bar,20090101,a,1
bar,20090102,a,3
bar,20090103,a,5
bar,20090101,b,1
bar,20090102,b,3
bar,20090103,b,5"""
df = pd.read_csv(StringIO(csv),
header=0,
ind...
Is Meyers' implementation of the Singleton pattern thread safe?
...ms, while most forms of double-checked locking pattern variants may suffer from race conditions on certain architectures, unless instructions are interleaved with strategically places memory barriers.
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How can I view MSIL / CIL generated by C# compiler? Why is it called assembly?
...much more convenient than loading up Visual Studio or running the compiler from the command line, then loading up ILDASM and opening the .il file with a text editor.
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How to mark-up phone numbers?
..."skype:echo123?call">Call the Skype Echo / Sound Test Service</a> from msdn.microsoft.com/en-us/library/office/…
– OzBob
Apr 2 '15 at 4:11
4
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What's the yield keyword in JavaScript?
...on of the algorithm. Each time you call next(), the generator code resumes from the statement following the yield.
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Assign variable in if condition statement, good practice or not? [closed]
I moved one years ago from classic OO languages such like Java to JavaScript. The following code is definitely not recommended (or even not correct) in Java:
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How to make my custom type to work with “range-based for loops”?
...n overload will not be called by a for(:) loop. See [stmt.ranged] 1.2-1.3 from n4527.
² Either call the begin/end method, or ADL-only lookup of free function begin/end, or magic for C-style array support. Note that std::begin is not called unless range_expression returns an object of type in nam...
Passing functions with arguments to another function in Python?
...
You can use the partial function from functools like so.
from functools import partial
def perform(f):
f()
perform(Action1)
perform(partial(Action2, p))
perform(partial(Action3, p, r))
Also works with keywords
perform(partial(Action4, param1=p))
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Connecting to remote URL which requires authentication using Java
...obably have to --add-modules javax.xml.bind since they removed the package from the default classpath. And in Java11+ it's removed altogether, you need an external dependency again. Such is progress!
– Ed Randall
Aug 18 '19 at 7:01
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Is embedding background image data into CSS as Base64 good or bad practice?
...der-encoder.asp (upload)
http://www.greywyvern.com/code/php/binary2base64 (from link with little tutorials underneath)
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