Pandas group-by and sum
Use GroupBy.sum:
pip or pip3 to install packages for Python 3?
Your pip is a soft link to the same executable file path with pip3. you can use the commands below to check where your pip and pip3 real paths are: You may also use the commands below to know more details: When we install different versions of python, we may create such soft links to set default pip to some version. make … Read more
“Cannot GET /” with Connect on Node.js
This code should work: Also in connect 2.0 .createServer() method deprecated. Use connect() instead.
How to define the basic HTTP authentication using cURL correctly?
From the documentation page: -u, –user <user:password> Specify the user name and password to use for server authentication. Overrides -n, –netrc and –netrc-optional. If you simply specify the user name, curl will prompt for a password. The user name and passwords are split up on the first colon, which makes it impossible to use a … Read more
How to convert a string to number in TypeScript?
Exactly like in JavaScript, you can use the parseInt or parseFloat functions, or simply use the unary + operator: All of the mentioned techniques will have correct typing and will correctly parse simple decimal integer strings like “123”, but will behave differently for various other, possibly expected, cases (like “123.45”) and corner cases (like null). Table taken from this answer
Does Python have an ordered set?
There is an ordered set (possible new link) recipe for this which is referred to from the Python 2 Documentation. This runs on Py2.6 or later and 3.0 or later without any modifications. The interface is almost exactly the same as a normal set, except that initialisation should be done with a list. This is a MutableSet, so the … Read more
Get Color Palettes from ColorHunt.co in Python
I am creating a Color Addon for Blender And I am trying to retrieve color Palettes From Famous sites. I would like to start with ColorHunt. Basically as you can see on the site there are a lot of color palettes. I would like to get all the avaiable palettes in an array containing the HEX … Read more
How do I test for an empty JavaScript object?
ECMA 5+: Note, though, that this creates an unnecessary array (the return value of keys). Pre-ECMA 5: jQuery: lodash: Underscore: Hoek ExtJS AngularJS (version 1) Ramda
scp or sftp copy multiple files with single command
I’d like to copy files from/to remote server in different directories. For example, I want to run these 4 commands at once. What is the easiest way to do that?
Why use bzero over memset?
I don’t see any reason to prefer bzero over memset. memset is a standard C function while bzero has never been a C standard function. The rationale is probably because you can achieve exactly the same functionality using memset function. Now regarding efficiency, compilers like gcc use builtin implementations for memset which switch to a particular implementation when a constant 0 is detected. Same for glibc when builtins are disabled.