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How to install multiple python packages at once using pip
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For installing multiple packages on the command line, just pass them as a space-delimited list, e.g.:
pip install wsgiref boto
For installing from a text file, then, from pip install --help:
-r FILENAME, --requirement=FILENAME
Install all the packages listed in the g...
What is the purpose of a plus symbol before a variable?
...icating the if on whether or not d is a non-zero number.
Reference here. And, as pointed out in comments, here.
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Is there any advantage of using map over unordered_map in case of trivial keys?
... in the case of keys with simple types -- I took a look at the interfaces, and didn't find any significant differences that would impact my code.
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mysql check collation of a table
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You can also query INFORMATION_SCHEMA.TABLES and get the collation for a specific table:
SELECT TABLE_SCHEMA
, TABLE_NAME
, TABLE_COLLATION
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = 't_name';
that gives a much more readable output in contrast to SHO...
How do I create 7-Zip archives with .NET?
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If you can guarantee the 7-zip app will be installed (and in the path) on all target machines, you can offload by calling the command line app 7z. Not the most elegant solution but it is the least work.
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项目管理实践【四】Bug跟踪管理【Bug Trace and Management】 - 项目管理 -...
项目管理实践【四】Bug跟踪管理【Bug Trace and Management】至于Bug的跟踪和管理的必要性和好处，我就不在这里说了，下面介绍几款Bug跟踪和管理的软件。一、BugNETBugNET是一个非常优秀的开源软件，基 至于Bug的跟踪和管理的必要性...
How can I save an image to the camera roll?
I am new to Xcode (using 4.3) and am not sure how to save an image to the device's camera roll. All that I have done so far is set up an IBAction for the button to save the image. What library method or function can I use to save an image to the user's camera roll?
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Changing three.js background to transparent or other color
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For transparency, this is also mandatory: renderer = new THREE.WebGLRenderer( { alpha: true } ) via Transparent background with three.js
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How to enumerate a range of numbers starting at 1
...o do in Python 2.6 or newer:
enumerate(range(2000, 2005), 1)
Python 2.5 and older do not support the start parameter so instead you could create two range objects and zip them:
r = xrange(2000, 2005)
r2 = xrange(1, len(r) + 1)
h = zip(r2, r)
print h
Result:
[(1, 2000), (2, 2001), (3, 2002), ...
How to filter multiple values (OR operation) in angularJS
I want to use the filter in angular and want to filter for multiple values, if it has either one of the values then it should be displayed.
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