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What are file descriptors, explained in simple terms?
... descriptors 0, 1, and 2 are standard input, standard output, and standard error for each running process. A successful initial call to open() will give you file descriptor 3, even if another running process happens to have a file descriptor 3. See the POSIX definition of open(): "The open() functio...
Difference between two dates in Python
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I have this error on the console: type object 'datetime.datetime' has no attribute 'strptime'
– mauguerra
Dec 7 '11 at 18:00
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How can sbt pull dependency artifacts from git?
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The branch only works if set to master, otherwise I get: [error] No project 'project_name' in 'ssh://git@github.com/user/project.git#branch'
– Neil
May 11 '16 at 22:19
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How to hide output of subprocess in Python 2.7
... PIPE, STDOUT
try:
from subprocess import DEVNULL # py3k
except ImportError:
import os
DEVNULL = open(os.devnull, 'wb')
text = u"René Descartes"
p = Popen(['espeak', '-b', '1'], stdin=PIPE, stdout=DEVNULL, stderr=STDOUT)
p.communicate(text.encode('utf-8'))
assert p.returncode == 0 # u...
Why are trailing commas allowed in a list?
... 1,
2,
3,
5
4,
]
# Now you have an error
But if you allow trailing commas, and use them, you can easily rearrange the lines without introducing an error.
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Center a map in d3 given a geoJSON object
...anslate it in order to center it. This is a very tedious task of trial and error, and I was wondering if anyone knew a better way to obtain these values?
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Vagrant reverse port forwarding?
...22 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o LogLevel=ERROR -o IdentitiesOnly=yes -i ~/.vagrant.d/insecure_private_key vagrant@127.0.0.1
SSH supports forwarding ports in the direction you want with the -R guestport:host:hostport option. So, if you wanted to connect to port 1234...
Application Loader: “Cannot proceed with delivery: an existing transporter instance is currently upl
I have been unable to overcome this error in Application Loader. I've quit, restarted, tried different computers - it's like the server is hung up on an op that I never initiated and it won't time out. Has anyone seen it before and beaten it?
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What does the line “#!/bin/sh” mean in a UNIX shell script?
...l ignore the !/usr/bin/whatever portion, which might otherwise be a syntax error in that particular language.
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How can I upload files asynchronously?
...console.log("Success: Files sent!");
}).fail(function(){
console.log("An error occurred, the files couldn't be sent!");
});
For a quick, pure JavaScript (no jQuery) example see "Sending files using a FormData object".
Fallback
When HTML5 isn't supported (no File API) the only other pure JavaSc...