Python

Play With Pillow

Who hasn't heard PIL? It's an image processing library made by python (Python Image Library). Pillow is an extension of it. So installing pillow is really easy: pip install pillow Now we are going to do some image processing cool stuff: First Load Image: from PIL import Image, ImageOps img = Image.open('image.png') Resize Image Suppose We want to resize an image and maintain its aspect ratio. Here we need to get the aspect ratio after resizing. Here is a snippet for it: def get_resize_image_size(image,…

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Python: Selenium with PhantomJs to capture Screenshots

PhantomJS is a headless WebKit scriptable with a JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG. And Selenium is A portable software-testing framework for web applications. Selenium provides a record/playback tool for authoring tests without the need to learn a test scripting language (Selenium IDE) Using the combination of selenium and PhantomJs can give you a way to capture screenshots and use it in your choices. For that let's install PhantomJs in your computer. For Ubuntu/Debian…

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Make a Blog using Django Part 1

"Making a blog using django" is probably the most made tutorial of Django. This post is no different. But I made this in my own way using some of django's built-in features so that less coding is required and making it more understandable with minimum packages to use. To view the working source of this tutorial, check here at: https://github.com/ruddra/myblog Before jumping to the main event, see if you have these installed in your pc: 1. Python 3 installed in the computer. (Or python 2.7…

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Change Column Header Dynamically in Django Tables2

Django Tables2 is a package which displays table directly from queryset. It shows column header based on object's attribute's name. But if someone wants to override it, how can he/she do that? Here is a easy solution. Suppose we have a model class like this: class SomeModel(models.Model): somevalue = models.CharField() And we want to show table column somevalue to overridenvalue Table Class: class SomeTable(tables.Table): def __init__(self, *args, _overriden_value="",**kwargs): super().__init__(*args, **kwargs) self.base_columns['somevalue'].verbose_name = _overriden_value class Meta:…

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Dynamically constructing filters based on string input using SQLAlchemy

Here I am going to write a dynamic filter. This filter is made for python 3. It will take query or model class and filter condtion as input, It will return filtered query based on those filter condition. This is constructed using this SO answer. Function: class DynamicFilter(ModelHelper): def __init__(self, query=None, model_class=None, filter_condition=None): super().__init__(*args, **kwargs) self.query = query self.model_class = model_class self.filter_condition = filter_condition def get_query(self): ''' Returns query with all the objects :return: '''…

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