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Check if an apt-get package is installed and then install it if it's not on Linux
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To check if packagename was installed, type:
dpkg -s <packagename>
You can also use dpkg-query that has a neater output for your purpose, and accepts wild cards, too.
dpkg-query -l <packagename>
To find what package owns the command, try:
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Map over object preserving keys
The map function in underscore.js, if called with a javascript object, returns an array of values mapped from the object's values.
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How to detect iPhone 5 (widescreen devices)?
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First of all, you shouldn't rebuild all your views to fit a new screen, nor use different views for different screen sizes.
Use the auto-resizing capabilities of iOS, so your views can adjust, and adapt any screen size.
That's not v...
NASM x86汇编入门指南 - C/C++ - 清泛网 - 专注C/C++及内核技术
...使得我们能处理真正的现代的32位汇编，32位代码运行在flat(平板)内存模型，其基本意思就是你根本不用再担心段寄存器的处理，因为你不必用段地址来重写或者修改段寄存器，它的每个地址都是32位长，并包含一个偏移量(这里...
Expand Python Search Path to Other Source
.... Remember that when you distribute your project to other users, they typically install it in such a manner that the Python code files will be automatically detected by Python's importer (i.e. packages are usually installed in the site-packages directory), so if you mess with sys.path in your code, ...
Can (domain name) subdomains have an underscore “_” in it?
...interior characters only letters, digits, and hyphen." Which part of that allows an underscore?
– claudekennilol
Sep 16 '16 at 19:01
2
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Is there a Subversion command to reset the working copy?
... under source control. I think the closest you could do is to iterate over all of the files, use then grep the result of svn list, and if the grep fails, then delete it.
EDIT:
The solution for the creative script is here: Automatically remove Subversion unversioned files
So you could create a scri...
What's the best practice to round a float to 2 decimals? [duplicate]
...tatistics in Java 2 years ago and I still got the codes of a function that allows you to round a number to the number of decimals that you want. Now you need two, but maybe you would like to try with 3 to compare results, and this function gives you this freedom.
/**
* Round to certain number of ...
Is there a difference between x++ and ++x in java?
Is there a difference between ++x and x++ in java?
16 Answers
16
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Download large file in python with requests
Requests is a really nice library. I'd like to use it for download big files (>1GB).
The problem is it's not possible to keep whole file in memory I need to read it in chunks. And this is a problem with the following code
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