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Programming Articles
Page 2200 of 2547
Get contents of a Tkinter Entry widget
An Entry widget is a basic one-line character widget that supports only single-line text input. An Entry widget can be defined by initializing the Entry(parent, width) constructor.To validate the Entry widget, we can use the get() method which results in the character entered in the Entry widget.Let us define an Entry widget that accepts single-line text input, and we will print the character that is input in the Entry widget.Example#Import the required Libraries from tkinter import * from tkinter import ttk #Create an instance of Tkinter frame win = Tk() #Set the geometry of Tkinter frame win.geometry("750x250") def get_content(): ...
Read MoreSave File Dialog Box in Tkinter
We often use Open and Save Dialog. They are common across many applications and we already know how these dialogs work and behave. For instance, if we click on open, it will open a dialog to traverse the location of the file. Similarly, we have the Save Dialog.We can create these dialogs using Python tkFileDialog package. In order to work with the package, we have to import this in our environment.Type the following command to import the tkFileDialog package in the notebook, from tkinter.filedialog import asksaveasfileExampleIn this example, we will create an application that will save the file using the ...
Read MoreData Chunks in Node.js
Data chunks in Node.js or any other language can be defined as a fragment of data that is sent to all the servers by the client. The servers make a stream of these chunks and form a buffer stream. This buffer stream is then converted into meaningful data.Syntaxrequest.on('eventName', [callback] )ParametersThe parameters are described below −eventName − It is the name of the event that will be fired.callback − Callback function to handle any error if it occurs.ExampleCreate a file with the name "index.js" and copy the following code snippet. After creating the file, use the command "node index.js" to run ...
Read MoreGiving Input to a Node.js Application
The main aim of a Node.js application is to work as a backend technology and serve requests and return response. But we can also pass inputs directly to a Node.js application.We can use readline-sync, a third-party module to accept user inputs in a synchronous manner.Syntaxnpm install readline-syncThis will install the readline-sync module dependency in your local npm project.Example 1Create a file with the name "input.js" and copy the following code snippet. After creating the file, use the command "node input.js" to run this code.//Giving Input to a Node.js application Demo Example // Importing the realine-sync module const readline = ...
Read MoreSetting the font color & style of the console in Node.js
You can use the chalk module to customize the statements printed on the console.By using it, one can change the text font-color to any color. One can also change the font-style to Bold, Italic or Underlined. Also, you can highlight the printed text.Syntaxnpm install chalkExample 1Create a file "color.js" and copy the following code snippet. After creating the file, use the command "node color.js" to run this code.// Giving color to console statments // Importing the chalk module const chalk = require('chalk'); // Printing the text in blue color console.log(chalk.blue('Welcome to Tutorials Point !')); // Printing the ...
Read MoreNode.js – util.types.isNativeError() Method
The util.types.isNativeError() method checks whether the passed value is a built-in error type or not. If the above condition is satisfied, it returns True, else False. The error can be of any type.Syntaxutil.types.isNativeError(value)ParametersIt takes a single parameter −value − This input value takes input for the required parameter and checks if it's an error type or not.It returns True or False based upon the input value passed.Example 1Create a file with the name "isNativeError.js" and copy the following code snippet. After creating the file, use the command "node isNativeError.js" to run this code.// util.types.isNativeError() Demo Example // Importing the ...
Read MoreNode.js – util.types.isAnyArrayBuffer() Method
The util.types.isAnyArrayBuffer() checks whether the passed value is an ArrayBuffer or a SharedArrayBuffer instance. It returns True if the above condition holds, else False.Syntaxutil.types.isAnyArrayBuffer(value)ParametersIt takes a single parameter −value − This input parameter takes input for the required datatype and checks if it's an ArrayBuffer or SharedArrayBuffer instance.It returns True or False based upon the input value passed.Example 1Create a file with the name "isArrayBuffer.js" and copy the following code snippet. After creating the file, use the command "node isArrayBuffer.js" to run this code// util.types.isAnyArrayBuffer() Demo Example // Importing the util module const util = require('util'); // Printing ...
Read MoreNode.js – util.types.isDate() Method
The util.types.isDate() method checks whether the passed value is a built-in Date instance or not. If the above condition is satisfied, it returns True, else False.Syntaxutil.types.isDate(value)ParametersIt takes a single parameter −value − This input value takes input for the required parameter and checks if it's a Date instance or not.It returns True or False based upon the input value passed.Example 1Create a file with the name "isDate.js" and copy the following code snippet. After creating the file, use the command "node isDate.js" to run this code.// util.types.isDate() Demo Example // Importing the util module const util = require('util'); ...
Read MoreNode.js – util.getSystemErrorName() Method
The util.getSystemErrorName() method is used for returning the string name of the numeric error code that is returned from the Node.js API. There is a mapping between the error codes and error names which is platform-dependent.Syntaxutil.getSystemErrorName(err)ParametersIt takes a single parameter −err −This parameter takes input as a numeric value that will specify the error number or the error code.The function returns the error name based upon the error code or error number passed in the err parameter.Some common system errors are - EACCES, EEXIST, EISDIR, ENOENT, ENOTDIR, ENOTEMPTY, etc. Browse this page to find the complete information about system error ...
Read MoreNode.js – util.types.isProxy() Method
The util.types.isProxy() method checks whether the passed value is a built-in Proxy instance or not. If the above condition is satisfied, it returns True, else False.Syntaxutil.types.isProxy(value)ParametersIt takes only one parameter −value − This input value takes input for the required parameter and checks if it is a Proxy instance or not.It returns True or False based upon the input value passed.Example 1Create a file "isProxy.js" and copy the following code snippet. After creating the file, use the command "node isProxy.js" to run this code.// util.types.isProxy() Demo Example // Importing the util module const util = require('util'); // Defining ...
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