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In Python, what is the difference between “.append()” and “+= []”?
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In general case append will add one item to the list, while += will copy all elements of right-hand-side list into the left-hand-side list.
Update: perf analysis
Comparing bytecodes we can assume that append version wastes cycles in LOAD_ATTR + CALL_FUNCTION, and += version -- in BUILD_LIST. App...
^M at the end of every line in vim
...g to do with editing a file in windows and then in linux. How can I remove all of these automatically?
9 Answers
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How can I use a search engine to search for special characters? [closed]
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duckduckgo.com doesn't ignore special characters, at least if the whole string is between ""
https://duckduckgo.com/?q=%22*222%23%22
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Code coverage with Mocha
...ul is. Try the following, after you get your mocha tests to pass:
npm install nyc
Now, simply place the command nyc in front of your existing test command, for example:
{
"scripts": {
"test": "nyc mocha"
}
}
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How can I open a link in a new window?
I have a click handler for a specific link, inside that I want to do something similar to the following:
10 Answers
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How do I find out what keystore my JVM is using?
...les---> JAVA_HOME
Your server startup batch files.
In your import command -keystore cacerts (give full path to the above JRE here instead of just saying cacerts).
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How do I copy an entire directory of files into an existing directory using Python?
...vantage. distutils.errors.DistutilsInternalError: mkpath: 'name' must be a string, i.e. it does not accept PosixPath. Need to str(PosixPath). Wish list for improvement. Other than this matter, I prefer this answer.
– Sun Bear
Aug 27 '19 at 11:59
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How do I reference an existing branch from an issue in GitHub?
Let's say I have a branch named feature/1 . And also issue #1. I want to link that branch to that issue.
5 Answers
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Mysql: Select rows from a table that are not in another
How to select all rows in one table that do not appear on another?
8 Answers
8
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In Python how should I test if a variable is None, True or False
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a = 'foo' if a: print 'its true' a is not actually TRUE, it's just not none
– wesm
Apr 3 '15 at 21:06
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