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putting current class as return type annotation [duplicate]
...unction definition time. Instead, they are preserved in __annotations__ in string form. This is called Postponed Evaluation of Annotations, introduced in PEP 563.
Also note:
Deprecation policy
Starting with Python 3.7, a __future__ import is required to use the
described functionality. ...
Is it safe to push_back an element from the same vector?
... a copy of t. Requires: T shall be CopyInsertable into X. Container basic_string, deque, list, vector
So even though it's not exactly trivial, the implementation must guarantee it will not invalidate the reference when doing the push_back.
...
Regular Expression: Any character that is NOT a letter or number
...lace(/[^\w]/);
It will replace all the non-alphabets and numbers from your string!
Edit 1: str.replace(/[^\w]/g, ' ')
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Oracle query to fetch column names
...ific user. in your case, I'd imagine the query would look something like:
String sqlStr= "
SELECT column_name
FROM all_tab_cols
WHERE table_name = 'USERS'
AND owner = '" +_db+ "'
AND column_name NOT IN ( 'PASSWORD', 'VERSION', 'ID' )"
Note that with this approach, you risk SQL injection....
Make sure only a single instance of a program is running
...ify_lock')
except socket.error as e:
error_code = e.args[0]
error_string = e.args[1]
print "Process already running (%d:%s ). Exiting" % ( error_code, error_string)
sys.exit (0)
The unique string postconnect_gateway_notify_lock can be changed to allow multiple programs that need...
How to create a drop-down list?
...n = findViewById(R.id.spinner1);
//create a list of items for the spinner.
String[] items = new String[]{"1", "2", "three"};
//create an adapter to describe how the items are displayed, adapters are used in several places in android.
//There are multiple variations of this, but this is the basic var...
If unit testing is so great, why aren't more companies doing it? [closed]
... students are not trained for it.
It's easy when you are writing your own string class. When you are testing a real-life product, you run into challenges that nobody told you about in the powerpoint slides:
User interaction. Half of your application is the user interface logic. How do you test it...
Determine if 2 lists have the same elements, regardless of order? [duplicate]
...f the lists won't be repeated (they are unique) as well as hashable (which strings and other certain immutable python objects are), the most direct and computationally efficient answer uses Python's builtin sets, (which are semantically like mathematical sets you may have learned about in school).
...
What is the difference between List (of T) and Collection(of T)?
...s that it is returning a new instance. Note that for e.g. a Dictionary<string, List<string>> to return List<string> is just fine, since the dictionary's state only encapsulates the identities of the lists therein, rather than their contents.
– supercat
...
How do you test functions and closures for equality?
...hashable object. Like:
var handler:Handler = Handler(callback: { (message:String) in
//handler body
}))
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