In version 0.19.0 you can use parameter dtype=”category” in read_csv: data=”col1,col2,col3\na,b,1\na,b,2\nc,d,3″ df = pd.read_csv(pd.compat.StringIO(data), dtype=”category”) print (df) col1 col2 col3 0 a b 1 1 a b 2 2 c d 3 print (df.dtypes) col1 category col2 category col3 category dtype: object If want specify column for category use dtype with dictionary: df = pd.read_csv(pd.compat.StringIO(data), … Read more
You can easily enough write a function that calls the readFile action, and passes the result to your index function. readAndIndex fileName = do text <- readFile fileName return $ index text However, the IO monad taints everything that uses it, so this function has the type: readAndIndex :: FilePath -> IO [(String, [Integer])]
Just had a go at this and it’s easier than you might expect. First, create a folder that lives in the same directory than your tests are. For example, I created a folder called test_resources. Then, let’s say we have the following JSON file for testing purposes. test_resources/contacts.json { “contacts”: [ { “id”: 1, “name”: … Read more
var fs = require(“fs”); var filename = “./index.html”; function start(resp) { resp.writeHead(200, { “Content-Type”: “text/html” }); fs.readFile(filename, “utf8”, function(err, data) { if (err) throw err; resp.write(data); resp.end(); }); }
Simply try the below code and you may understand import React, { Component } from ‘react’; class App extends Component { constructor(props) { super(props); } showFile = async (e) => { e.preventDefault() const reader = new FileReader() reader.onload = async (e) => { const text = (e.target.result) console.log(text) alert(text) }; reader.readAsText(e.target.files[0]) } render = () … Read more
if let path = Bundle.main.path(forResource: “README”, ofType: “txt”) { do { textView.text = try String(contentsOfFile: path, encoding: .utf8) } catch let error { // Handle error here } } Just drop the file anywhere into the project browser and make sure it is added to the right target. Just to expand on the answer, you … Read more
So, anytime you have multiple async operations to coordinate in some way, I immediately want to go to promises. And, the best way to use promises to coordinate a number of async operations is to make each async operation return a promise. The lowest level async operation you show is fs.readFile(). Since I use the … Read more
Readfile will read the file directly into the output buffer, and file_get_contents will load the file into memory, when you echo the result the data is copied from memory to the output buffer effectively using 2 times the memory of readfile.
Node.js does not use Require.js. Require.js was built so that you could have asynchronous module loading on the client-side (in your browser). Node.js uses CommonJS style modules. Your code using CommonJS would look like this: var fs = require(‘fs’); console.log(“\n *STARTING* \n”); var contents = fs.readFileSync(“sliderImages”, “utf8”); If we assume you saved this in a … Read more
In version 0.19.0 you can use parameter dtype=”category” in read_csv: data=”col1,col2,col3\na,b,1\na,b,2\nc,d,3″ df = pd.read_csv(pd.compat.StringIO(data), dtype=”category”) print (df) col1 col2 col3 0 a b 1 1 a b 2 2 c d 3 print (df.dtypes) col1 category col2 category col3 category dtype: object If want specify column for category use dtype with dictionary: df = pd.read_csv(pd.compat.StringIO(data), … Read more