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Why can't I use a list as a dict key in python?
I'm a bit confused about what can/can't be used as a key for a python dict.
11 Answers
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What is the difference between char s[] and char *s?
In C, one can use a string literal in a declaration like this:
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Eclipse Workspaces: What for and why?
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I'll provide you with my vision of somebody who feels very uncomfortable in the Java world, which I assume is also your case.
What it is
A workspace is a concept of grouping together:
a set of (somehow) related projects
some configuration per...
When should I use mmap for file access?
...accessing files. There's the standard system calls open() , read() , write() , and friends, but there's also the option of using mmap() to map the file into virtual memory.
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What does threadsafe mean?
...tbox from a thread (other than the UI thread) and an exception was thrown. It said something about the "code not being thread safe" and so I ended up writing a delegate (sample from MSDN helped) and calling it instead.
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Parsing JSON with Unix tools
...om the command line, and will be a lot easier and more reliable than doing it with Awk, such as jq:
curl -s 'https://api.github.com/users/lambda' | jq -r '.name'
You can also do this with tools that are likely already installed on your system, like Python using the json module, and so avoid any e...
Can you make valid Makefiles without tab characters?
... have a tab character preceding the the content of each command line, or it throws a syntax error.
10 Answers
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Why use Ruby instead of Smalltalk? [closed]
Ruby is becoming popular , largely from the influence Ruby on Rails, but it feels like it is currently struggling through its adolescence. There are a lot of similarities between Ruby and Smalltalk -- maglev is a testament to that. Despite having a more unusual syntax, Smalltalk has all (if not m...
Why are dashes preferred for CSS selectors / HTML attributes?
... Over the last few years I changed over to dashes, mostly to align myself with the trend in the community , not necessarily because it made sense to me.
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Why do enum permissions often have 0, 1, 2, 4 values?
...two and I can do this:
var permissions = Permissions.Read | Permissions.Write;
And perhaps later...
if( (permissions & Permissions.Write) == Permissions.Write )
{
// we have write access
}
It is a bit field, where each set bit corresponds to some permission (or whatever the enumerated ...