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PostgreSQL error: Fatal: role “username” does not exist
... owning_user (in this case, h9uest). After that you can run rake db:create from the terminal under whatever account name you set up without having to enter into the Postgres environment.
share
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imp...
Django filter versus get for single object?
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You can install a module called django-annoying and then do this:
from annoying.functions import get_object_or_None
obj = get_object_or_None(MyModel, id=1)
if not obj:
#omg the object was not found do some error stuff
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How to un-escape a backslash-escaped string?
...ings. The following works for Python3 in all cases, as far as I can tell:
from codecs import encode, decode
sample = u'mon€y\\nröcks'
result = decode(encode(sample, 'latin-1', 'backslashreplace'), 'unicode-escape')
print(result)
As outlined in the comments, you can also use the literal_eval me...
C# pattern to prevent an event handler hooked twice [duplicate]
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Calls to Invoke() will have to be switched from the public event to the private delegate, e.g. Foo?.Invoke() would now become foo?.Invoke(). Otherwise you get an error.
– toddmo
Oct 19 '17 at 16:19
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How do you enable “Enable .NET Framework source stepping”?
Update 22nd Feb 2013 : The Microsoft Connect entry has note from Alok Shriram (Program Manager, Base Class Libraries, .NET Framework) that the issue should now be resolved. The Connect entry is marked as Resolved (Fixed) :
...
Can two different strings generate the same MD5 hash code?
...53,7 @@
6d
a0
d1
-55
+d5
5d
83
60
Above collision example is taken from Marc Stevens: Single-block collision for MD5, 2012; he explains his method, with source code (alternate link to the paper).
Another test:
$ echo '0e306561559aa787d00bc6f70bbdfe3404cf03659e704f8534c00ffb659c4c8740cc94...
Convert a list to a data frame
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This method suffers from the null situation.
– Frank Wang
May 9 '12 at 9:38
3
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Java String to SHA1
... you how.
return byteArrayToHexString(md.digest(convertme))
and (copied from Real's How To)
public static String byteArrayToHexString(byte[] b) {
String result = "";
for (int i=0; i < b.length; i++) {
result +=
Integer.toString( ( b[i] & 0xff ) + 0x100, 16).substring( 1 ...
No connection could be made because the target machine actively refused it?
...ameter is often configurable if you control the server, and is likely read from some settings file or the registry. Investigate how to configure your server.
If you wrote the server, you might have heavy processing in the accept of your socket, and this can be better moved to a separate worker-thr...
Globally override key binding in Emacs
...actly what you asked for, I will mention for posterity another solution.
From The Emacs Manual:
"Don't define C-c letter as a key in Lisp programs. Sequences consisting of C-c and a letter (either upper or lower case) are reserved for users; they are the only sequences reserved for users, so d...