Python Programming
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The mmap() copy-on-write trick: reducing memory usage of array copies
Let’s say you have an array, and you need to make some copies and modify those copies. Usually, memory usage scales with the number of copies: if your original array was 1GB of RAM, each copy will take 1GB of RAM. And that can add up.
But often, you’re just changing a small part of the array. Ideally, the memory cost would only be the parts of the copies that you changed.
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Pip Install Specific Version of a Python Package: 2 Steps
In this Python tutorial, you will learn how to use pip install a specific version of a package. The outline of the post (as also can be seen in the ToC) is as follows. First, you will get a brief introduction with examples on when you might need to install an older version of a package. Second, you will get the general syntax for how to carry out this task. After that, you will get two steps to installing specific versions of Python packages with pip. In this section, you will also learn how to work with a virtual environment. In the next section, we will look at how to specify the version of multiple Python packages by creating a .txt file.
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Angular 10 and Django 3 Image Files Upload with FormData
Throughout this tutorial, we'll see how we can implement file and image upload in Django 3, Django REST Framework and Angular 10 with a step by step example.
Our application will expose an /upload REST API endpoint that accepts POST requests which contain the image file posted with a multipart/form-data content type via FormData.
For the frontend, we'll be using Angular 10 to create a simple interface that allows the user to select a file or image and upload it to the server via a POST request using HttpClient and FormData.
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Multiple Image Files Upload with Django 3, Angular 10 and FormData
In the previous tutorial we have seen how to implement image file uploading in Django 3 and Angular 10. In this tutorial, we'll see how to implement multiple file uploading with FormData and HttpClient.
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Python: Check if File or Directory is Empty
Python has a set of built-in library objects and functions to help us with this task. In this tutorial, we'll learn how to check if a file or directory is empty in Python.
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For Loop vs. List Comprehension
Many simple “for loops” in Python can be replaced with list comprehensions. You can often hear that list comprehension is “more Pythonic” (almost as if there was a scale for comparing how Pythonic something is, compared to something else
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