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Python hashable dicts
...another dictionary for obvious reasons.
class hashabledict(dict):
def __hash__(self):
return hash(tuple(sorted(self.items())))
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fol...
What does $_ mean in PowerShell?
...ich is called $PSItem in Powershell 3 and newer.
1,2,3 | %{ write-host $_ }
or
1,2,3 | %{ write-host $PSItem }
For example in the above code the %{} block is called for every value in the array. The $_ or $PSItem variable will contain the current value.
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Realistic usage of the C99 'restrict' keyword?
...00 00 00 callq 40b <fr+0x1b>
407: R_X86_64_PC32 memset-0x4
40b: 48 83 c4 08 add $0x8,%rsp
40f: 48 89 da mov %rbx,%rdx
412: 48 89 ef mov %rbp,%rdi
415: 5b pop %rbx
416: 5d...
Installing Python packages from local file system folder to virtualenv with pip
...
The equivalent easy_install command is easy_install --allow-hosts=None --find-links file:///srv/pkg/mypackage mypackage
– Wilfred Hughes
Dec 13 '17 at 16:23
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How do I list all files of a directory?
...
A bit simpler: (_, _, filenames) = walk(mypath).next() (if you are confident that the walk will return at least one value, which it should.)
– misterbee
Jul 14 '13 at 20:56
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Where should signal handlers live in a django project?
...ke:
yourapp/signals/handlers.py:
from django.db.models.signals import pre_save
from django.dispatch import receiver
from myapp.models import MyModel
@receiver(pre_save, sender=MyModel)
def my_handler(sender, **kwargs):
pass
The best place to register your signal handler is then in the AppCo...
How to make a variadic macro (variable number of arguments)
...way, also supported by VC++ compiler.
#define FOO(fmt, ...) printf(fmt, ##__VA_ARGS__)
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Qt: can't find -lGL error
...nu/mesa/libGL.so.1
/usr/lib/i386-linux-gnu/mesa/libGL.so.1.2.0
/usr/lib/x86_64-linux-gnu/libGLEW.so.1.10
/usr/lib/x86_64-linux-gnu/libGLEW.so.1.10.0
/usr/lib/x86_64-linux-gnu/libGLEWmx.so.1.10
/usr/lib/x86_64-linux-gnu/libGLEWmx.so.1.10.0
/usr/lib/x86_64-linux-gnu/libGLU.so.1
/usr/lib/x86_64-linux-g...
How to write inline if statement for print?
... condition:
block
if expression (introduced in Python 2.5)
expression_if_true if condition else expression_if_false
And note, that both print a and b = a are statements. Only the a part is an expression. So if you write
print a if b else 0
it means
print (a if b else 0)
and similarly ...
How to duplicate sys.stdout to a log file?
...ileno())
print "\nstdout"
print >>sys.stderr, "stderr"
os.spawnve("P_WAIT", "/bin/ls", ["/bin/ls"], {})
os.execve("/bin/ls", ["/bin/ls"], os.environ)
You could also emulate tee using the multiprocessing package (or use processing if you're using Python 2.5 or earlier).
Update
Here is a Py...