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心情记录 · App Inventor 2 中文网
...显示开心次数。
4. 加入加法块
从“数学”抽屉拖出 __ + __，接到 设 happyLabel.文本 为 的输入槽。
5. 读取当前 happyLabel.文本
从 happyLabel 抽屉拖出 happyLabel.文本，接到加法块的第一个输入槽。当前标签文字会作为旧的计数值...
Is it Linq or Lambda?
...
This is LINQ (using query syntax):
var _Results = from item in _List
where item.Value == 1
select item;
This is also LINQ (using method syntax):
var _Results = _List.Where(x => x.Value == 1);
It's interesting to note that bo...
uint8_t vs unsigned char
What is the advantage of using uint8_t over unsigned char in C?
8 Answers
8
...
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
...+ b[k]) for k in set(b) & set(a)])
or even more generic:
def combine_dicts(a, b, op=operator.add):
return dict(a.items() + b.items() +
[(k, op(a[k], b[k])) for k in set(b) & set(a)])
For example:
>>> a = {'a': 2, 'b':3, 'c':4}
>>> b = {'a': 5, 'c':6, 'x':7...
Combining INSERT INTO and WITH/CTE
...TE's name is not optional:
WITH tab AS (
bla bla
)
INSERT INTO dbo.prf_BatchItemAdditionalAPartyNos (
BatchID,
AccountNo,
APartyNo,
SourceRowID
)
SELECT * FROM tab
Please note that the code assumes that the CTE will return exactly four fields and that those fields are matching in order and ...
Why call git branch --unset-upstream to fixup?
...and then the one with only the static generated files residing in $WEBSITE/_deploy. The funny thing of the setup is that there is a .gitignore file in the $WEBSITE directory so that this setup actually works.
Enough introduction. In this case the error might also come from the repository in _deploy...
How can I scale an image in a CSS sprite
...alt="" src="spacer.png">
<img class="sprite" alt="icon" src="sprite_800x160.jpg">
</a>
<a class="stretchy s2" href="#">
<img class="spacer" alt="" src="spacer.png">
<img class="sprite" alt="icon" src="sprite_800x160.jpg">
</a>
<a class="stretchy s3" hr...
Token Authentication for RESTful API: should the token be periodically changed?
... you can extend it to achieve this functionality.
For example:
from rest_framework.authentication import TokenAuthentication, get_authorization_header
from rest_framework.exceptions import AuthenticationFailed
class ExpiringTokenAuthentication(TokenAuthentication):
def authenticate_credentia...
Restoring MySQL database from physical files
... a single tablespace *, which by default consist of the 3 files ibdata1, ib_logfile0, and ib_logfile1. for restoring a database, you would also need those files. * per-table tablespaces are possible, but not default
– ax.
Aug 21 '09 at 18:18
...
Animate a custom Dialog
...ion">
<item name="android:windowEnterAnimation">@anim/spin_in</item>
<item name="android:windowExitAnimation">@android:anim/slide_out_right</item>
</style>
</resources>
The windowEnterAnimation is one of my animations and is located in res...