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Insert line after first match using sed
For some reason I can't seem to find a straightforward answer to this and I'm on a bit of a time crunch at the moment. How would I go about inserting a choice line of text after the first line matching a specific string using the sed command. I have ...
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Python int to binary string?
...() function: format(n, 'b'). There is no need to parse out the placeholder and match it to an argument, go straight for the value formatting operation itself. Only use str.format() if you need to place the formatted result in a longer string (e.g. use it as a template).
– Marti...
How to display request headers with command line curl
Command line curl can display response header by using -D option, but I want to see what request header it is sending. How can I do that?
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Using Java 8 to convert a list of objects into a string obtained from the toString() method
...things in Java 8. E.g., I can iterate with a stream over a list of objects and then sum the values from a specific field of the Object 's instances. E.g.
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Algorithm to find Largest prime factor of a number
...factorisation. It makes use of the identity N = (a + b)(a - b) = a^2 - b^2 and is easy to understand and implement. Unfortunately it's not very fast in general.
The best known method for factoring numbers up to 100 digits long is the Quadratic sieve. As a bonus, part of the algorithm is easily done...
C/C++ with GCC: Statically add resource files to executable/library
...stream to make an iostream. std::stringstream is not great for this though and you can of course just use a pointer anywhere you can use an iterator.
If you're using this with automake don't forget to set BUILT_SOURCES appropriately.
The nice thing about doing it this way is:
You get text out, ...
How do I correctly clean up a Python object?
__del__(self) above fails with an AttributeError exception. I understand Python doesn't guarantee the existence of "global variables" (member data in this context?) when __del__() is invoked. If that is the case and this is the reason for the exception, how do I make sure the object destructs...
Using the scrollwheel in GNU screen
...tach from your screen, then screen -d -r to reattach, then ls a few times, and try to scroll back. It works for me.
What is this magic? Well, let's consult the manual pages.
screen(1) says:
termcapinfo term terminal-tweaks [window-tweaks]
[..]
The first argument specifies which terminal(s)...
What are dictionary view objects?
...sentially what their name says: views are simply like a window on the keys and values (or items) of a dictionary. Here is an excerpt from the official documentation for Python 3:
>>> dishes = {'eggs': 2, 'sausage': 1, 'bacon': 1, 'spam': 500}
>>> keys = dishes.keys()
>>>...
Is there a short contains function for lists?
...m not in list:
# do something
It's work fine for lists, tuples, sets and dicts (check keys).
Note that this is an O(n) operation in lists and tuples, but an O(1) operation in sets and dicts.
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