Interestingly, this method of installing packages will not work in most cases. If your Python interpreter was installed globally for all the users of your computer, chances are your regular user account is not going to have permission to make modifications to it, so the only way to make the command above work is to run it from an administrator account. But even without that complication, consider what happens when you install a package as above. The pip tool is going to download the package from PyPI, and then add it to your Python installation. From that point on, every Python script that you have on your system will have access to this package. Imagine a situation where you have completed a web application using version 1.1 of Flask, which was the most current version of Flask when you started, but now has been superseded by version 2.0. You now want to start a second application, for which you'd like to use the 2.0 version, but if you replace the 1.1 version that you have installed you risk breaking your older application. Do you see the problem? It would be ideal if it was possible to have Flask 1.1 installed and accessible to your old application, while also install Flask 2.0 for your new one.
With this command, I'm asking Python to run the venv package, which creates a virtual environment named venv. The first venv in the command is the name of the Python virtual environment package, and the second is the virtual environment name that I'm going to use for this particular environment. If you find this confusing, you can replace the second venv with a different name that you want to assign to your virtual environment. In general I create my virtual environments with the name venv in the project directory, so whenever I cd into a project I find its corresponding virtual environment.
all i want is you zip miguel
Download File: https://ssurll.com/2vIbGp
Note that the above installation commands does not specify which version of Flask you want to install. The default when no version is specified is to install the latest version available in the package repository. This tutorial can be followed with Flask versions 1 and 2. The above command will install the latest 2.x version. If for any reason you prefer to follow this tutorial on a 1.x release of Flask, you can use the following command to install the latest 1.x version:
Before I end this chapter, I will do one more thing. Since environment variables aren't remembered across terminal sessions, you may find tedious to always have to set the FLASK_APP environment variable when you open a new terminal window. Starting with version 1.0, Flask allows you to register environment variables that you want to be automatically imported when you run the flask command. To use this option you have to install the python-dotenv package:
Thank you for this nice series of tutorials. After working on this Mega tutorial series, will I be able to implement a blog like yours (blog.miguelgrinberg.com) and deploy it for production as described here -this-blog?
@Francis: This is the format that is recommended for current releases of Flask. You can use the old style of starting the app if you want, that still works, though there is only some issues that you may experience if you use it with the Flask reloader.
Thank you so much for all your time. I'm yet another coder who learned flask from your work years ago, and have used it extensively ever since. I'd like to request, which you can totally ignore if you want, that you give context on why certain things changed. I'm thinking the switch from "views" to "routes" for example. I'm sure it won't always make sense to, but that bit of context would be appreciated where it makes sense!
Hi Miguel & to all others on this forum. I am new to coding and have been making my way through as steadily as i can, as i am older with kids, trying to go for something i really want and change my life.
I have installed Python3 and am using the venv...thank you for the explanation. But flask calls click, and it seems to have some Unicode issue with Python 3. The click web page suggests using Python 2.7. At this stage, I really just want to get on with my new web pages, not try to debug some esoteric incompatibility in the underlying software. Should I drop back to 2.7? Perhaps install a different click?
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