ModuleNotFoundError: No module named 'backtrader' ModuleNotFoundError Traceback (most recent call last) You can see the error when we try to import it. If you try to import such packages without installing them first you would get an error called 'ModuleNotFoundError'.įor example, Backtrader is a Python package used for live trading and backtesting trading strategies. But what about the packages that do not come along with Python installation? Python has certain in-built packages which are installed along with the installation of Python. Also, the use of dots in the module titles saves the author of multi-module packages from having to worry about each other’s module names. Packaging the modules in such a way saves the author of different modules from having to worry about each other’s global variable names. It is a way of structuring Python’s module namespace by using "dotted module names".įor example, the module name “matplotlib.pyplot” designates a submodule named “pyplot” in a package named “matplotlib”. Packages are nothing but a collection of modules. The definitions from a module can be imported into other modules or in the program that we code. To support this, Python has a way to put a code definition in a file and use them in any Python script (code lines). Also, we can find a way to copy and paste the lines of code each time we wish to use the same, without having to create the code lines every time we want the same program. This is known as writing a script.Īs a program gets longer, we may want to split it into several small files for easier maintenance. In order to write a long program, we might consider a text editor to write the Python code lines. When we write Python code lines for a particular task, for instance, trade order execution or for entering a trade signal (buy or sell), we use the Python environment such as the Python or IPython console.
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Press Shift+F10 to open the context menu.Press F7 to check spelling and Shift+F7 to open thesaurus for a selected word.Press Windows+Alt+N to open small note window without opening the whole app.Let’s begin the guide with some handy, time-saving keyboard shortcuts. Also, if you are just getting started it with, these tricks will certainly benefit you too. Here are some of the coolest and most productive OneNote tips and tricks for power users who are looking to boost their productivity. But there are other features hidden beneath the surface. You can create text, voice, video notes and attach pretty much any file right inside a note. Microsoft OneNote often makes the list of best note-taking apps irrespective of which blog you land on, and for a good reason. So, in your, terminal copy-pastes the given command and hit the Enter key. With the addition of the GPG key, we can go for the official Google chrome repository that offers the packages we require to install the browser in Debian Linux including Bookworm. curl -fSsL | sudo gpg -dearmor | sudo tee /usr/share/keyrings/google-chrome.gpg > /dev/null Adding the Google Chrome repository to Debian 12 Therefore, it is better to add the GPG key first and then the repository using the next step. But later while installing the browser, the system will generate errors and refuse to install any package from the repository of Chrome. We can go without adding the digital GPG key used to sign the packages of Chrome browser for the Debian Linux systems. sudo apt update & sudo apt upgradeĪlso, install curl and apt-transport-https sudo apt install apt-transport-https curl -y Google Chrome Linux signing key Also, running the system update command will rebuild the package index cache for APT, so that it could recognize the latest versions available to install through the system default or added repositories. Might be there are some updates available that must be on your Debian 12 to mitigate the package compatibility issues. That is sudo or root user access and active internet connectivity. The prerequisites required to install Google Chrome on Debian 12 are not new, it is like any other software installation for Linux. Final thoughts: Installing Google Chrome in Debian 12 LinuxĪlthough we have performed this guide to configure Chrome browser on Debian 12, this step-by-step guide can be used for Debian 11 Bullseye as well. Since this web browser is based on Chromium, it looks and feels similar to Google Chrome. That said, the option to access the Chrome Web Store and a wide range of Chromium-repositories comes as a major relief. There’s no option to import and synchronize this data during the transition. Once again, the only drawback is that you’ll have to download extensions manually. Most PCs will not take longer than a minute before the transition takes place. Whether you’re transitioning from Internet Explorer or a third-party browser like Opera, Avast Secure Browser, or Mozilla Firefox, you can import data without any issues. Once you’ve downloaded and installed the program, the first launch lets you import a wide range of data, including history, passwords, open tabs, cookies, bookmarks, payment information, favorites, and more. Unlike Internet Explorer, Microsoft Edge can be downloaded on Windows 7, Windows 8, Windows 10, Windows 11, iOS, macOS, and Android platforms. With such tracking prevention features, Microsoft Edge is counted among the most secure internet browsers. On the other hand, you can even switch to Level 3, which removes complete access, and requires you to grant permissions. It lets most websites track your online activity without disruptions. If you’re not too concerned about tracking prevention, you can change the settings to Level 1. By default, you will begin with Level 2, entitled Balanced, to block harmful trackers. This version of the popular internet browser, therefore, comes with three different levels of tracking prevention. Since the tool integrates well with the Chrome Web Store, you can download and use a wide range of web apps on your computer.Īlso, Microsoft Edge focuses on the growing need for data privacy and security. If you’re looking for an alternative internet browser, this one will be a good choice. With Microsoft Edge download, the transition from one browser to another is seamless and hassle-free. As such, if you’re looking to watch movies on popular streaming websites, the program promises a smoother viewing experience. Additionally, it comes with personalized tab layouts, tracking prevention, the ability to reject or accept targeted ads, and 4K streaming. Compared to other Chromium-based web browsers, including Google Chrome, the latest version of Microsoft Edge is faster. fun returnNullable(): String? = "dummy data"įun returnNonNullable(): String = "dummy data"īelow is their bytecode. The Kotlin compiler, on the other hand, detects when we try to assign a null to nonNull variable and throws an error.īut what happens when we call a predefined function? Does the compiler need to walk up the call chain and check the source code of each and every function? What if we only have the bytecode and don’t have the source code? Check the return type of a function Both are compiled into Ljava/lang/String. LOCALVARIABLE canBeNull Ljava/lang/String L1 元 0Īs we can see, at the bytecode level, there is no difference between a nullable type and a non-nullable type. LOCALVARIABLE nonNull Ljava/lang/String L2 元 1 Val nonNull: String = null // compiler error Below is the code to define a String and a String? val canBeNull: String? = null We will start with the simplest case, null safety with a local nullable variable. The same principle can be applied to any other type. But at the end of the day, Kotlin code is still compiled into bytecode and runs on the JVM.Īs an example, today we will find out how Kotlin distinguishes between the String and String? types when the JVM only knows of Ljava/lang/String. Kotlin distinguishes between references that can hold null (nullable types) and references that cannot (non-nullable types). One of Kotlin’s improvements over Java is null safety. Note: phiên bản Tiếng Việt của bài này ở link dưới. The program supports multiple sources, including media files, games, web pages, application windows, webcams, your desktop, microphone and more. OBS Studio (a rewrite of the original Open Broadcaster) is a comprehensive open-source package for video recording and live streaming. You can also enter a password hint, although this step may be unnecessary and perhaps risky since there's also an account recovery option. To set up LastPass, start by creating an account on with your email address and a strong (and memorable) master password. There are browser extensions for Chrome, Firefox, Safari, Edge and Opera, desktop apps for Windows and macOS, and mobile apps for iOS (13.0 or later) and Android (5 or later).įor LastPass testing, I used a 2020 MacBook Air running macOS 10.15.7 Catalina and an iPhone XR with browser testing on Google Chrome. To run the LastPass browser extensions, you must have Windows 8.1 and later or one of the most recent two versions of macOS, Linux or Chrome OS. The LastPass Family plan ($48 annually) has all the same features as Premium with unlimited shared folders for up to six users. LastPass does offer a 30-day free trial so you can test out the premium features. That said, LastPass Free users still get to have an unlimited number of passwords, one-to-one sharing, secure notes, limited multi-factor authentication and the LastPass Authenticator app.Īn upgrade to LastPass Premium ($36 annually) unlocks unlimited device syncing, one-to-many sharing, advanced MFA, 1GB of file storage, emergency access, 1-to-1 support and a host of security-monitoring features. With other password managers on the market offering unlimited free syncing ( Bitwarden and Myki, for example), LastPass may no longer be the top free choice. However, the company in early 2021 limited syncing to a single device type: Users on the free plan can access their vaults on mobile or on desktop, but not both. For many years, LastPass' free tier was a steal, with most of the basic features you'd want in a password manager, including unlimited syncing across all your devices.
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