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How to catch a thread's exception in the caller thread in Python?

I have the following script which copies files from one location to another. If the files cannot be copied, an exception is thrown. The following code does not work: , How to catch the exception?
Manogna
Answered on 6th Dec, 2017

The problem is that thread_obj.start() returns immediately. The child thread that you started executes in its own context, in its own stack. Any exception that occurs there is in the context of the child thread. You have to communicate this information to the parent thread by passing some message.The code ... Read More

How to catch an exception while using a Python 'with' statement?

I have a code: , How to raise exception while using python ‘with’ statement?
Manogna
Answered on 6th Dec, 2017

The code can be rewritten to catch the exception as follows:try:      with open("myFile.txt") as f:           print(f.readlines()) except:     print('No such file or directory')We get the following outputC:/Users/TutorialsPoint1/~.py No such file or directory Read More

Suggest a cleaner way to handle Python exceptions?

I have the following code where there is repetitive clean up involved. , Is there an elegant way of handling repetitive clean-ups in exception handling?
Manogna
Answered on 6th Dec, 2017

We can use the finally clause to clean up whether an exception is thrown or not:try:   #some code here except:   handle_exception() finally:   do_cleanup()If the cleanup is to be done in the event of an exception, we can code like this:should_cleanup = True try:   #some code here ... Read More

How to write custom Python Exceptions with Error Codes and Error Messages?

I have an application App with error codes and error messages like this in the code below. , How do I write custom python exceptions with error codes and error messages?
Rajendra Dharmkar
Answered on 6th Dec, 2017

We can write custom exception classes with error codes and error messages as follows:class ErrorCode(Exception):     def __init__(self, code):         self.code = code     try:     raise ErrorCode(401) except ErrorCode as e:     print "Received error with code:", e.codeWe get outputC:/Users/TutorialsPoint1/~.py Received error ... Read More

Are Python Exceptions runtime errors?

If I run the code given below , I get an error. Is it a python RuntimeError?
Rajendra Dharmkar
Answered on 6th Dec, 2017

All python exceptions are not runtime errors, some are syntax errors as well.If you run the given code, you get the following output.File "C:/Users/TutorialsPoint1/~.py", line 4 else: ^ SyntaxError: invalid syntaxWe see that it is syntax error and not a runtime error.Errors or inaccuracies in a program are often called ... Read More

How to handle python exception inside if statement?

I have the following code with an exception inside if statement , I am not able to catch the exception. How to catch the exception?
Rajendra Dharmkar
Answered on 6th Dec, 2017

The code can be written as follows to catch the exceptiona, b=5, 0 try:    if b != 0:        print a/b    else:        a/b        raise ZeroDivisionError except Exception as e:        print eWe get the following outputC:/Users/TutorialsPoint1/~.py integer division ... Read More

How to check if string or a substring of string ends with suffix in Python?

I have a string which is basically a file path of a .py file. , How do check if it ends in py?
Rajendra Dharmkar
Answered on 6th Dec, 2017

Python has a method endswith(string) in the String class. This method accepts a suffix string that you want to search and is called on a string object. You can call this method in the following way:string = 'C:/Users/TutorialsPoint1/~.py' print(string.endswith('.py'))OUTPUTTrueThere is another way to find if a string ends with a ... Read More

How to check whether a string ends with one from a list of suffixes in Python?

, How do I check if the above string ends in one from a list of suffixes?
Rajendra Dharmkar
Answered on 6th Dec, 2017

Python has a method endswith(tuple) in the String class. This method accepts a tuple of strings that you want to search and is called on a string object. You can call this method in the following way:string = 'core java' print(string.endswith(('txt', 'xml', 'java', 'orld')))OUTPUTTrueThere is another way to find if ... Read More

How do I add a simple jQuery script to WordPress?

I have created a lot of websites on WordPress. For adding functionalities, I generally use WordPress plugins, but now I don’t want to add more number of plugins. I want to learn how to a.....
Amit D
Answered on 6th Dec, 2017

WordPress is an open source CMS, used to develop dynamic websites. Let’s learn how to add jQuery script to WordPress. In the WordPress Theme folder, create a folder "js", and add a file in that. That file will be your Query file with extension “.js”. Add your jQuery script to that ... Read More

How to call a jQuery plugin without specifying any elements?

While working on jQuery, I want to call a jQuery plugin, but I do not want to mention any of the elements. Is this possible to achieve in jQuery? If yes, then which jQuery method is used to ca.....
Amit D
Answered on 6th Dec, 2017

To call a jQuery plugin without specifying any elements, use extend method. Here’s a snippet showing how to call a jQuery plugin without specifying any elements:$.fn.extend({   myFunction1: function(){...} }); $.extend({   myFunction2: function(){...} });Above, you can see we’re calling myFunction1 and myFunction2 without specifying any elements and using ... Read More

How to call a function inside a jQuery plugin from outside?

I need to set property for the elements. Also, I am quite confused with how to use jQuery plugins. How can I call a function inside a jQuery plugin from outside and print the result in log.
Amit D
Answered on 6th Dec, 2017

To call a function inside a jQuery plugin from outside, try to run the following code. The code updates the name with jQuery as an example using properties:Live Demo<html>    <head>       <script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>       <script>          $.fn.person = function(prop) { ... Read More

How to call a jQuery plugin function outside the plugin?

I am working on jQuery and its plugins. I am quite confused with how to use jQuery plugins. How can I call a jQuery plugin function outside the plugin?
Amit D
Answered on 6th Dec, 2017

jQuery is a JavaScript library introduced to make development with JavaScript easier. It reduces the development time. Let us see how to call a jQuery plugin function outside the plugin.For calling, wrap the jQuery method for returning the instance of the constructor. Call prototype methods on it.For example, $.fn.myFunction = ... Read More

How to call a jQuery library function?

I have setup environment for jQuery on my local machine. Now, I am moving towards other concepts of jQuery. How can I call a jQuery library function? Which tag is used to call a jQuery library.....
David Meador
Answered on 6th Dec, 2017

Calling a JavaScript library function is quite easy. You need to use the script tag. As almost everything we do when using jQuery reads or manipulates the document object model (DOM), we need to make sure that we start adding events etc. as soon as the DOM is ready.If you ... Read More

How to setup jQuery on my web server?

I have a website and I want to setup jQuery on my web server itself. jQuery can be set using the Google or Microsoft CDN easily. But, I want to setup jQuery on my web server. How can I set env.....
David Meador
Answered on 5th Dec, 2017

To run jQuery on your web pages, add the library file within a pair of <script> tags. The location of the jQuery library file is added under the <script> tags, which point to the location of the jQuery library file on the Web server. Here’s an example, <script src="jquery/jquery-3.2.1.min.js"></script>The location ... Read More

How to link jQuery from my local machine?

I want to set environment for jQuery on my local machine, since I have just started working with jQuery. How to link jQuery from local machine easily? From where should I download the official.....
Alex Onsman
Answered on 5th Dec, 2017

You can add jQuery using CDN or through downloading it on local machine. For Local Installation, download jQuery library on your local machine and include it in your HTML code. The following are the steps:Go to the jQuery website to download the latest version available.Now put downloaded jquery-3.2.1.min.js file in ... Read More

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