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Referring to the null object in Python
...Empty()
>>> empty==None
True
But then it also works on the empty string
>>> empty==''
True
And yet
>>> ''==None
False
>>> empty is None
False
Case 2: Using None as a boolean
The following two tests
if value:
# Do something
if not value:
# Do something
...
Are multiple `.gitignore`s frowned on?
...ability to have multiple .gitignore files is very useful is if you want an extra directory in your working copy that you never intend to commit. Just put a 1-byte .gitignore (containing just a single asterisk) in that directory and it will never show up in git status etc.
...
What is the meaning and difference between subject, user and principal?
...at is the benefit of breaking things down to Subject, Principal, User, its extra complexity what benefit do we get from this extra complexity?
– ams
Feb 17 '11 at 6:20
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Does the C++ standard mandate poor performance for iostreams, or am I just dealing with a poor imple
...ouldn't assume that blindly). So what does feature? Running GProf on your ostringstream code compiled with GCC gives the following breakdown:
44.23% in std::basic_streambuf<char>::xsputn(char const*, int)
34.62% in std::ostream::write(char const*, int)
12.50% in main
6.73% in std::ostream::s...
Why are quaternions used for rotations?
... because they can do more than rotations. But in the case of rotations the extra components are determined in terms of the others.
– JMP
Jan 18 '12 at 23:45
2
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How can I reconcile detached HEAD with master/origin?
...nally implemented as symbolic links, but later changed to plain files with extra interpretation so that they could be used on platforms that do not have symlinks.)
We have HEAD → refs/heads/master → 17a02998078923f2d62811326d130de991d1a95a
When HEAD is detached, it points directly to a commit...
wget/curl large file from google drive
... https://drive.google.com/open?id=0B7_OwkDsUIgFWXA1B2FPQfV5S8H. Obtain the string behind the ?id= and copy it to your clipboard. That's the file's ID.
Download the file. Of course, use your file's ID instead in the following command.
gdrive download 0B7_OwkDsUIgFWXA1B2FPQfV5S8H
At first usage, t...
Set Viewbag before Redirect
...ata["shortMessage"] content
ViewBag.Message = TempData["shortMessage"].ToString();
return View();
}
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What do (lambda) function closures capture?
...lent way is the one recommended by Adrien Plisson. Create a lambda with an extra argument, and set the extra argument's default value to the object you want preserved.
A little more verbose but less hacky would be to create a new scope each time you create the lambda:
>>> adders = [0,1,2,3...
Proper way to handle multiple forms on one page in Django
...t instantiates these, without using either the messages framework or query strings? This answer seems the closest, but here it's still just one view handling both forms: stackoverflow.com/a/21271659/2532070
– YPCrumble
Oct 15 '14 at 10:10
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