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Convert xlsx to csv in Linux with command line
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The Gnumeric spreadsheet application comes with a command line utility called ssconvert that can convert between a variety of spreadsheet formats:
$ ssconvert Book1.xlsx newfile.csv
Using exporter Gnumeric_stf:stf_csv
$ cat newfile.csv
Foo,Bar,Baz
1,2,3
123.6,7.89,
2012/05/14...
How do you create a random string that's suitable for a session ID in PostgreSQL?
I'd like to make a random string for use in session verification using PostgreSQL. I know I can get a random number with SELECT random() , so I tried SELECT md5(random()) , but that doesn't work. How can I do this?
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How to create a new object instance from a Type
...l.
There are a lot of overloads for passing parameters to the constructor and such. Check out the documentation at:
http://msdn.microsoft.com/en-us/library/system.activator.createinstance.aspx
or (new path)
https://docs.microsoft.com/en-us/dotnet/api/system.activator.createinstance
Her...
How do I get the parent directory in Python?
...is an entire RFC 1808 written to address the issue of relative path in URI and all the subtlety of the presence and absence of a trailing /. If you know of any documentation that says they should be treated equivalent in general please point it out.
– Wai Yip Tung
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Syntax highlighting code with Javascript [closed]
... Google Code uses it for their own repo highlighting (since they wrote it) and automatically detects the language.
– Karan
Oct 2 '08 at 4:14
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Why not be dependently typed?
... a dependently-typed language". The implication seems to be that with more and more language extensions, Haskell is drifting in that general direction, but isn't there yet.
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How do I calculate a point on a circle’s circumference?
... r * cos(a)
y = cy + r * sin(a)
Where r is the radius, cx,cy the origin, and a the angle.
That's pretty easy to adapt into any language with basic trig functions. Note that most languages will use radians for the angle in trig functions, so rather than cycling through 0..360 degrees, you're cycli...
How to convert strings into integers in Python?
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int() is the Python standard built-in function to convert a string into an integer value. You call it with a string containing a number as the argument, and it returns the number converted to an integer:
print (int("1") + 1)
The above prints 2....
In Python, how to display current time in readable format
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First the quick and dirty way, and second the precise way (recognizing daylight's savings or not).
import time
time.ctime() # 'Mon Oct 18 13:35:29 2010'
time.strftime('%l:%M%p %Z on %b %d, %Y') # ' 1:36PM EDT on Oct 18, 2010'
time.strftime(...
Can an enum class be converted to the underlying type?
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I think you can use std::underlying_type to know the underlying type, and then use cast:
#include <type_traits> //for std::underlying_type
typedef std::underlying_type<my_fields>::type utype;
utype a = static_cast<utype>(my_fields::field);
With this, you don't have to ass...