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Unable to modify ArrayAdapter in ListView: UnsupportedOperationException
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Is a Python dictionary an example of a hash table?
...t; hash(b)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: list objects are unhashable
>>> a[b] = 'some'
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: list objects are unhashable
You can read...
MySQL: how to get the difference between two timestamps in seconds
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177
You could use the TIMEDIFF() and the TIME_TO_SEC() functions as follows:
SELECT TIME_TO_SEC(T...
Test parameterization in xUnit.net similar to NUnit
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140
xUnit offers a way to run parameterized tests through something called data theories. The conc...
How do you turn off version control in android studio?
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+100
To disable VCS in Android Studio on a Mac do the following:
Android Studio > Preferences...
In the Preferences window, select...
Why do function pointer definitions work with any number of ampersands '&' or asterisks '*'?
... implicitly convertible to a pointer to the function. This is why void (*p1_foo)() = foo; works: foo is implicitly converted into a pointer to itself and that pointer is assigned to p1_foo.
The unary &, when applied to a function, yields a pointer to the function, just like it yields the addr...
ipython notebook clear cell output in code
...utput of a cell.
from IPython.display import clear_output
for i in range(10):
clear_output(wait=True)
print("Hello World!")
At the end of this loop you will only see one Hello World!.
Without a code example it's not easy to give you working code. Probably buffering the latest n events i...
Rails params explained?
.... For example, if a user's browser requested
http://www.example.com/?foo=1&boo=octopus
then params[:foo] would be "1" and params[:boo] would be "octopus".
In HTTP/HTML, the params are really just a series of key-value pairs where the key and the value are strings, but Ruby on Rails has a spe...
Wrapping null-returning method in Java with Option in Scala?
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183
The Option companion object's apply method serves as a conversion function from nullable refer...