大约有 6,261 项符合查询结果（耗时：0.0238秒） [XML]
Executing JavaScript without a browser?
...iles with the #!/usr/bin/js shebang line and things will just work:
$ cat foo.js
#!/usr/bin/js
console.log("Hello, world!");
$ ls -lAF /usr/bin/js /etc/alternatives/js /usr/bin/nodejs
lrwxrwxrwx 1 root root 15 Jul 16 04:26 /etc/alternatives/js -> /usr/bin/nodejs*
lrwxrwxrwx 1 root root ...
Django: Why do some model fields clash with each other?
...above the apps and then import the apps e.g.
myproject/
apps/
foo_app/
bar_app/
So if you are importing apps, foo_app and bar_app then you could get this issue. I had apps, foo_app and bar_app all listed in settings.INSTALLED_APPS
And you want to avoid importing apps anyway, b...
Pandas - How to flatten a hierarchical index in columns
...(pd.__version__) # '0.23.4'
index = pd.MultiIndex.from_product(
[['foo', 'bar'], ['baz', 'qux']],
names=['a', 'b'])
print(index)
# MultiIndex(levels=[['bar', 'foo'], ['baz', 'qux']],
# codes=[[1, 1, 0, 0], [0, 1, 0, 1]],
# names=['a', 'b'])
Applying to_flat_ind...
MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update
...: { _id: "some potentially existing id" },
update: {
$setOnInsert: { foo: "bar" }
},
new: true, // return new doc if one is upserted
upsert: true // insert the document if it does not exist
})
As $setOnInsert only affects documents being inserted, if an existing document is found, no...
Form inside a form, is that alright? [duplicate]
...gt;</form>
<div id="toolbar">
<input type="text" name="foo" form="saveForm" />
<input type="hidden" value="some_id" form="deleteForm" />
<input type="text" name="foo2" id="foo2" form="saveForm" value="success" />
<input type="submit" name="save" val...
Default value for field in Django model
...can set the default like this:
b = models.CharField(max_length=7,default="foobar")
and then you can hide the field with your model's Admin class like this:
class SomeModelAdmin(admin.ModelAdmin):
exclude = ("b")
sha...
Use of alloc init instead of new
...be using a different method, such as [[SomeObject alloc] initWithString: @"Foo"]. If you're used to writing this, you get in the habit of doing it this way and so [[SomeObject alloc] init] may come more naturally that [SomeObject new].
...
Understanding Python's “is” operator
...lly with certain objects.
E.g.
>>> class A(object):
... def foo(self):
... pass
...
>>> a = A()
>>> a.foo is a.foo
False
>>> id(a.foo) == id(a.foo)
True
Ref;
Why do you use typedef when declaring an enum in C++?
...02000000
};
you'll have to use it doing something like :
enum TokenType foo;
But if you do this :
typedef enum e_TokenType
{
blah1 = 0x00000000,
blah2 = 0X01000000,
blah3 = 0X02000000
} TokenType;
You'll be able to declare :
TokenType foo;
But in C++, you can use only th...
How to access property of anonymous type in C#?
...
Then from that you look up a property:
PropertyInfo p = t.GetProperty("Foo");
Then from that you can get a value:
object v = p.GetValue(o, null);
This answer is long overdue for an update for C# 4:
dynamic d = o;
object v = d.Foo;
And now another alternative in C# 6:
object v = o?.GetTy...