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how do you filter pandas dataframes by multiple columns
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Note that the Gender and Year should both be strings, i.e., 'Gender' and 'Year'.
– Steven C. Howell
May 4 '17 at 19:47
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Bash, no-arguments warning, and case decisions
...s"; fi
Result
No args
Details
-z is the unary operator for length of string is zero.
$* is all arguments.
The quotes are for safety and encapsulating multiple arguments if present.
Use man bash and search (/ key) for "unary" for more operators like this.
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Returning JSON from PHP to JavaScript?
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@FunkDoc the OP in question was stringing together JSON by hand, under the assumption that was their only choice. Knowing it wasn't their only choice was a suitable solution. There is no obligation that the end result of that JSON will be emitted as HTTP re...
Swift equivalent for MIN and MAX macros
... accept any parameter type that conforms to Comparable protocol, may it be String, Character or one of your custom class or struct.
Thereby, the following Playground sample code works perfectly:
class Route: Comparable, CustomStringConvertible {
let distance: Int
var description: String {...
How do I get logs/details of ansible-playbook module executions?
...e: Debug hello
debug: var=hello
- name: Debug hello.stdout as part of a string
debug: "msg=The script's stdout was `{{ hello.stdout }}`."
Output should look something like this:
TASK: [Hello yourself] ********************************************************
changed: [MyTestHost]
TASK: [Deb...
How do I check if a file exists in Java?
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Using java.io.File:
File f = new File(filePathString);
if(f.exists() && !f.isDirectory()) {
// do something
}
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How does node.bcrypt.js compare hashed and plaintext passwords without the salt?
...e length of the salt
Must also know the position of the salt in the final string. e.g. if offset by a specific number from left or right.
These two things are usually hard coded in the implementation e.g. the bcrypt implementation source for bcryptjs defines the salt length as 16
/**
* @type {nu...
jQuery - select all text from a textarea
...only meant for copy-paste. all the text I have inside it is a big encryted string which can only be either entirely replaced, or copied to the clipboard
– Alex
Apr 26 '11 at 23:48
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Node.js: Difference between req.query[] and req.params
Is there a difference between obtaining QUERY_STRING arguments via req.query[myParam] and req.params.myParam ? If so, when should I use which?
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Default initialization of std::array?
...; default-initialize every element of the array.
For example, if T = std::string, every element will be an empty string. If T is a class without a default constructor, both will fail to compile. If T = int, every element will have indeterminate value (unless that declaration happens to be at namesp...