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How to filter rows in pandas by regex
....startswith('f')].
Result:
a b
1 2 foo
2 3 fat
I think what you expect.
Alternatively you can use contains with regex option. For example:
foo[foo.b.str.contains('oo', regex= True, na=False)]
Result:
a b
1 2 foo
na=False is to prevent Errors in case there is nan...
Why is inserting in the middle of a linked list O(1)?
...
For purposes of comparing with an array, which is what that chart shows, it's O(1) because you don't have to move all the items after the new node.
So yes, they are assuming that you already have the pointer to that node, or that getting the pointer is trivial. In other ...
Why does 1==1==1 return true, “1”==“1”==“1” return true, and “a...
...s which are equal when operands
refer to the same object in memory.
So what happens in c is that "a" is converted to a number (giving NaN) and the result is strictly compared to true converted to a number (giving 1).
Since 1 === NaN is false, the third function returns false. It's very easy to ...
Pod install is staying on “Setting up CocoaPods Master repo”
...uld try running in verbose mode:
pod install --verbose
This'll show you what cocoapods is up to:
Setting up CocoaPods master repo
Cloning spec repo `master` from `https://github.com/CocoaPods/Specs.git` (branch `master`)
$ /usr/bin/git clone 'https://github.com/CocoaPods/Specs.git' master
C...
support FragmentPagerAdapter holds reference to old fragments
...ewpager+":"+pos;
}
Then I simply get a reference to that fragment and do what I need like so...
Fragment f = this.getSupportFragmentManager().findFragmentByTag(getFragmentTag(1));
((MyFragmentInterface) f).update(id, name);
viewPager.setCurrentItem(1, true);
Inside my fragments I set the setRet...
Round a Floating Point Number Down to the Nearest Integer?
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@HelinWang That's exactly what OP asked for.
– Petr Peller
Nov 18 '13 at 9:57
5
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git add . vs git commit -a
What's the difference between:
3 Answers
3
...
Programmer Puzzle: Encoding a chess board state throughout a game
...mmer is to be able to correctly and unambiguously specify the problem.
So what’s missing or ambiguous? A lot as it turns out.
Board State vs Game State
The first thing you need to determine is whether you’re storing the state of a game or the position of pieces on the board. Encoding simply t...
get string value from HashMap depending on key name
...wing:
I'm expecting to see a String, such as "ABC" or "DEF" as that is what I put in there initially, but if I do a System.out.println() I get something like java.lang.string#F0454
Sorry, I'm not too familiar with maps as you can probably guess ;)
You're seeing the outcome of Object#toStr...
Rails: Missing host to link to! Please provide :host parameter or set default_url_options[:host]
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Yeah what do you do if you have multiple env domains?
– wejrowski
Mar 2 '12 at 18:52
...