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How to remove the lines which appear on file B from another file A?
I have a large file A (consisting of emails), one line for each mail. I also have another file B that contains another set of mails.
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NodeJS - What does “socket hang up” actually mean?
...a certain website I'm getting the following error (it only happens on this one website, no others that I try to scrape.
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Combining two lists and removing duplicates, without removing duplicates in original list
...ot_in_first)
print(result) # Prints [1, 2, 2, 5, 9, 7]
Or if you prefer one-liners 8-)
print(first_list + list(set(second_list) - set(first_list)))
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How to generate and validate a software license key?
...aveat: you can't prevent users from pirating, but only make it easier for honest users to do the right thing.
Assuming you don't want to do a special build for each user, then:
Generate yourself a secret key for the product
Take the user's name
Concatentate the users name and the secret key and h...
What is wrong with using goto? [duplicate]
I was ramdomming through xkcd and saw this one (if also read some negative texts about them some years ago):
What is actually wrong with it? Why are goto's even possible in C++ then?
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White space showing up on right side of page when background image should extend full length of page
...images are having problems in FireFox as well as Safari in iOS on iPads/iPhones with white space showing up on the right side of the page.
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How can I read input from the console using the Scanner class in Java?
...der is synchronized, so read operations on a BufferedReader can be safely done from multiple threads. The buffer size may be specified, or the default size(8192) may be used. The default is large enough for most purposes.
readLine() « just reads data line by line from the stream or source. A line ...
Which version of C# am I using
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To get version of framework - look at version of one of main Assemblies i.e.
Console.Write(typeof(string).Assembly.ImageRuntimeVersion);
Getting version of C# compiler is somewhat harder, but you should be able to guess version by checking what framework version is us...
What is the most compatible way to install python modules on a Mac?
...xtra Python library in your home dir. Yes, Python will work with more than one library location: one controlled by MacPorts and a user local one for everything missing within MacPorts.
Now notice that I favor pip over easy_install. There is a good reason you should avoid setuptools and easy_install...
Is it safe to check floating point values for equality to 0?
... 1 by 3 are
unequal.
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Rather than comparing for equality,
one recommended technique involves
defining an acceptable margin of
difference between two values (such as
.01% of one of the values). If the
absolute value of the difference
between the two values is less than or
...