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Does SQLAlchemy have an equivalent of Django's get_or_create?
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That's basically the way to do it, there is no shortcut readily available AFAIK.
You could generalize it ofcourse:
def get_or_create(session, model, defaults=None, **kwargs):
instance = session.query(model).filter_by(**kwargs).firs...
How to convert SQL Query result to PANDAS Data Structure?
... that will do the job:
from pandas import DataFrame
df = DataFrame(resoverall.fetchall())
df.columns = resoverall.keys()
You can go fancier and parse the types as in Paul's answer.
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Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...果想追究清楚他们之间具体细节差异，麻烦自己查看实现源码即可。
4-2 Android应用OnTrimMemory()实现性能建议
OnTrimMemory是Android 4.0之后加入的一个回调方法，作用是通知应用在不同的情况下进行自身的内存释放，以避免被系统直...
Combine two ActiveRecord::Relation objects
...lation.or(last_name_relation)
† Only in ActiveRecord 5+; for 4.2 install the where-or backport.
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Wait for page load in Selenium
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does this really work all the time? Maybe Im missing something from your code but you are waiting for the dom to be in ready state. But consider that if your code executes too fast the previous page might not be unloaded yet and it will ...
How to fully remove Xcode 4
I want to remove all existing SDK versions as well as Xcode 4.
7 Answers
7
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Getting the object's property name
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More specifically, Object.keys(obj) returns an array of property names, i.e. keys, belonging to the passed in obj.
– a learner has no name
Mar 26 '16 at 12:43
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What's the difference between IEquatable and just overriding Object.Equals()?
...t you avoid a cast from System.Object which can make a difference if it's called frequently.
As noted on Jared Parson's blog though, you still must implement the Object overrides.
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Clear icon inside input text
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jQ will add the class x (if input has value) showing the clear icon.
Now all we need is to target with jQ the inputs with class x and detect on mousemove if the mouse is inside that 18px "x" area; if inside, add the class onX.
Clicking the onX class removes all classes, resets the input value and ...
Double vs. BigDecimal?
...tudes (say d1=1000.0 and d2=0.001) could result in the 0.001 being dropped alltogether when summing as the difference in magnitude is so large. With BigDecimal this would not happen.
The disadvantage of BigDecimal is that it's slower, and it's a bit more difficult to program algorithms that way (du...