大约有 10,000 项符合查询结果（耗时：0.0144秒） [XML]
Django: Get an object form the DB, or 'None' if nothing matches
...
There are two ways to do this;
try:
foo = Foo.objects.get(bar=baz)
except model.DoesNotExist:
foo = None
Or you can use a wrapper:
def get_or_none(model, *args, **kwargs):
try:
return model.objects.get(*args, **kwargs)
except model.DoesNo...
Converting Dictionary to List? [duplicate]
...ution for your problem:
[(k,v) for k,v in dict.items()]
and result:
[('Food', 'Fish&Chips'), ('2012', 'Olympics'), ('Capital', 'London')]
or you can do
l=[]
[l.extend([k,v]) for k,v in dict.items()]
for:
['Food', 'Fish&Chips', '2012', 'Olympics', 'Capital', 'London']
...
How do I enumerate the properties of a JavaScript object? [duplicate]
...ated, but also from the prototypes of any parent objects.
var myObject = {foo: 'bar'};
for (var name in myObject) {
alert(name);
}
// results in a single alert of 'foo'
Object.prototype.baz = 'quux';
for (var name in myObject) {
alert(name);
}
// results in two alerts, one for 'foo' and on...
How to rsync only a specific list of files?
...e source dir. For example, take this command:
rsync -a --files-from=/tmp/foo /usr remote:/backup
If /tmp/foo contains the string "bin" (or even "/bin"), the /usr/bin directory will be created as /backup/bin on the remote host. If it contains "bin/" (note the trailing slash), the immedi...
Interpolating a string into a regex
...
Same as string insertion.
if goo =~ /#{Regexp.quote(foo)}/
#...
share
|
improve this answer
|
follow
|
...
Converting an object to a string
... This doesn't work if the object has a function property, eg: foo: function () {...}.
– Brock Adams
Sep 29 '12 at 14:54
...
virtualenv --no-site-packages and pip still finding global packages?
...YTHONPATH=
Then create and activate the virtual environment:
virtualenv foo
. foo/bin/activate
Only then:
pip freeze
share
|
improve this answer
|
follow
...
redirect COPY of stdout to log file from within bash script itself
...al from him by simply
# adding his answer to mine.
exec 2>&1
echo "foo"
echo "bar" >&2
Note that this is bash, not sh. If you invoke the script with sh myscript.sh, you will get an error along the lines of syntax error near unexpected token '>'.
If you are working with signal tr...
HAProxy redirecting http to https (ssl)
...--------------------
frontend unsecured *:80
redirect location https://foo.bar.com
#---------------------------------------------------------------------
# frontend secured
#---------------------------------------------------------------------
frontend secured *:443
mode tcp
default_bac...
Difference between two dates in Python
...nswered Dec 7 '11 at 17:22
Fred FooFred Foo
317k6464 gold badges662662 silver badges785785 bronze badges
...