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Re-raise exception with a different type and message, preserving existing information
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206
Python 3 introduced exception chaining (as described in PEP 3134). This allows, when raising a...
Can a for loop increment/decrement by more than one?
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265
Use the += assignment operator:
for (var i = 0; i < myVar.length; i += 3) {
Technically,...
Passing an integer by reference in Python
... workaround is to simply return the object that you want:
def multiply_by_2(x):
return 2*x
x = 1
x = multiply_by_2(x)
*In the first example case above, 3 actually gets passed to x.__setitem__.
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Find running median from a stream of integers
...aller than maxHeap root add it to maxHeap,
else add it to minHeap
Step 2: Balance the heaps (after this step heaps will be either balanced or
one of them will contain 1 more item)
if number of elements in one of the heaps is greater than the other by
more than 1, remove the root elemen...
Can someone explain mappedBy in JPA and Hibernate?
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152
By specifying the @JoinColumn on both models you don't have a two way relationship. You have tw...
How to create a custom string representation for a class object?
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280
Implement __str__() or __repr__() in the class's metaclass.
class MC(type):
def __repr__(sel...
MySQL select one column DISTINCT, with corresponding other columns
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12 Answers
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Ruby on Rails: How can I revert a migration with rake db:migrate?
...nt to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
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Square retrofit server mock for testing
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Mock Retrofit 2.0 Requests for Testing
As the old mechanisms like creating MockClient class and implementing it from Client are not working anymore with Retrofit 2.0, here I describe a new way of doing that. All what you need to do now is...
What happens when a computer program runs?
...r on some systems (see Billy O'Neal's answer below for more details on Win32).
Other systems can be very different. DOS, for instance, ran in real mode, and its memory allocation when running programs looked much differently:
+-----------+ top of memory
| extended | above the high memory area,...