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How can I return two values from a function in Python?
... two values, but you can return a tuple or a list and unpack it after the call:
def select_choice():
...
return i, card # or [i, card]
my_i, my_card = select_choice()
On line return i, card i, card means creating a tuple. You can also use parenthesis like return (i, card), but tuples ar...
Portable way to get file size (in bytes) in shell?
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One would guess the portable ls -ln FILE | { read _ _ _ _ size _ && echo "$size"; } needs not fork for the second step of the pipeline, as it uses just built-ins, but Bash 4.2.37 on Linux forks twice (still only one execve, though).
– Palec
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Rails: create on has_one association
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First of all, here is how to do what you want:
@user = current_user
@shop = Shop.create(params[:shop])
@user.shop = @shop
Now here's why your version did not work:
You probably thought that this might work because if User had a ha...
How do I join two lines in vi?
...ou join lines as is -- without adding or removing whitespaces:
S<Switch_ID>_F<File type>
_ID<ID number>_T<date+time>_O<Original File name>.DAT
Result:
S<Switch_ID>_F<File type>_ID<ID number>_T<date+time>_O<Original File name>.DAT
With...
Can I escape html special chars in javascript?
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I think regular expressions in replace() calls are unnecessary. Plain old single-character strings would do just as well.
– jamix
May 30 '14 at 14:47
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PostgreSQL Crosstab Query
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Install the additional module tablefunc once per database, which provides the function crosstab(). Since Postgres 9.1 you can use CREATE EXTENSION for that:
CREATE EXTENSION IF NOT EXISTS tablefunc;
Improved test case
CREATE ...
How to completely uninstall Visual Studio 2010?
...ly and ultimately remove Visual Studio 2010 from my computer. When you install Visual Studio, it also installs a bunch of programs (about 55) in the add/remove programs panel ( appwiz.cpl ).
...
How to gracefully handle the SIGKILL signal in Java
...uts down in response to two kinds of events:
The program exits normally, when the last non-daemon thread exits or when the exit (equivalently, System.exit) method is invoked, or
The virtual machine is terminated in response to a user interrupt, such as typing ^C, or a system-wide event, su...
Starting python debugger automatically on error
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You can use traceback.print_exc to print the exceptions traceback. Then use sys.exc_info to extract the traceback and finally call pdb.post_mortem with that traceback
import pdb, traceback, sys
def bombs():
a = []
print a[0]
if __name__ == '...
“Unknown class in Interface Builder file” error at runtime
...th it, and prints the warning.
By default, Objective-C targets will have -all_load -ObjC flags set by default, which will keep all of the symbols. But I had started with a C++ target, and didn't have that. Nevertheless, I found a way around this, which keeps the linker aggressive.
The hack I was...