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What is the difference between double-ampersand (&&) and semicolon (;) in Linux Bash?
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The && operator is a boolean AND operator: if the left side returns a non-zero exit status, the operator returns that status and does not evaluate the right side (it short-circuits), otherwise it evaluates the right side and returns its e...
GCD to perform task in main thread
...t come from any thread. When I get this callback, then I would like to perform a certain task on the main thread.
4 Answers...
How does mockito when() invocation work?
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The short answer is that in your example, the result of mock.method() will be a type-appropriate empty value; mockito uses indirection via proxying, method interception, and a shared instance of the MockingProgress class in order t...
Open document with default OS application in Python, both in Windows and Mac OS
... same thing that happens when you double-click on the document icon in Explorer or Finder. What is the best way to do this in Python?
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API to automatically upload apk to Google Play? [closed]
Is there any API or tool that enables me to automatically upload an APK to Google Play? I want to automatically publish customized apps to my account without any manual steps or graphical interface.
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ValueError: math domain error
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Your code is doing a log of a number that is less than or equal to zero. That's mathematically undefined, so Python's log function raises an exception. Here's an example:
>>> from math import log
>>> log(-1)
Traceback (most recent call last):
File "<pyshel...
Git repository broken after computer died
My computer went dead and now one of my git repositories is broken. When I try to checkout master it tells me:
15 Answers
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Determine the line of code that causes a segmentation fault?
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(gdb) backtrace
<offending code is shown here>
Here is a nice tutorial to get you started with GDB.
Where the segfault occurs is generally only a clue as to where "the mistake which causes" it is in the code. The given location is not necessarily where the problem resides.
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Real world example about how to use property feature in python?
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Other examples would be validation/filtering of the set attributes (forcing them to be in bounds or acceptable) and lazy evaluation of complex or rapidly changing terms.
Complex calculation hidden behind an attribute:
class PDB_Calculator(object):
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@property
def protein_foldin...
Unzip a file with php
I want to unzip a file and this works fine
12 Answers
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