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How do I pass a string into subprocess.Popen (using the stdin argument)?
...avoid deadlocks due
to any of the other OS pipe buffers
filling up and blocking the child
process.
So your example could be written as follows:
from subprocess import Popen, PIPE, STDOUT
p = Popen(['grep', 'f'], stdout=PIPE, stdin=PIPE, stderr=STDOUT)
grep_stdout = p.communicate(input=...
Ruby Arrays: select(), collect(), and map()
...
It looks like details is an array of hashes. So item inside of your block will be the whole hash. Therefore, to check the :qty key, you'd do something like the following:
details.select{ |item| item[:qty] != "" }
That will give you all items where the :qty key isn't an empty string.
offic...
When should I use Struct vs. OpenStruct?
..."preferred" approach of customizing the struct with methods is to pass the block to constructor Point = Struct.new(:x, :y) { methods here }. (source) Of course, { ... } there can be written as a multi-line block (do ... end) and, I think, that's the preferred way.
– Ivan Kolmy...
Emacs mode for Stack Overflow's markdown
... can use its feature for working with source code. With it you can include blocks of markdown inside your Org-mode buffers which you can edit via markdown-mode. You can use it as follows:
When in an Org-mode buffer enter <s on a newline and press Tab. This will result in
#+begin_src
#+end_sr...
Is ASCII code 7-bit or 8-bit?
...and ECMA-6. And it is 8-bit (ISO/IEC) 8859-1 that forms the first 256-char block of Unicode.
– dave_thompson_085
Dec 27 '15 at 21:37
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How to print colored text in Python?
...ascii characters below 127, and '#' or '@' is probably your best bet for a block. If you can ensure your terminal is using a IBM extended ascii character set, you have many more options. Characters 176, 177, 178 and 219 are the "block characters".
Some modern text-based programs, such as "Dwarf For...
Getting error while sending email through Gmail SMTP - “Please log in via your web browser and then
... than once every 10
minutes, the app’s access to your account could be blocked.
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Understanding the main method of python [duplicate]
...nts of a system then one can still use __name__ == "__main__" to isolate a block of code which calls a suite of unit tests that apply to this module.
(If you're not going to have any such functionality nor unit tests than it's best to ensure that the file mode is NOT executable).
Summary: if __nam...
What exactly are “spin-locks”?
... it is cheaper to enter a busy waiting loop and pool a resource instead of blocking when the resource is locked.
Spinning can be beneficial when locks are fine grained and large in number (for example, a lock per node in a linked list) as well as when lock hold times are always extremely short. In ...
Thread vs ThreadPool
...O completion methods always complete essentially instantaneously and never block, and the number of such threads that are presently running such methods is at least equal to the number of processors, the only way any other thread could run before one of the aforementioned methods finishes would be i...