I’m new to python and I want to update every record that has count 0 in the database. I have tried a lot can’t find anything like help. Answer Assuming your table has this structure: Here is the simple code code- Also, since you mentioned that you are new to python remember to commit, every time, …
Django: Get previous value in clean() method
I have a model CustomModel with an IntegerField. When I create a new instance of CustomModel in the admin, I have to do validation, so I use the clean method and have access to the value with. My problem: When I change the instance of CustomModel, I only have access to the new, changed value but not to the or…
How to show all columns’ names on a large pandas dataframe?
I have a dataframe that consist of hundreds of columns, and I need to see all column names. What I did: The output is: How do I show all columns, instead of a truncated list? Answer You can globally set printing options. I think this should work: Method 1: Method 2: This will allow you to see all column names
TypeError: ‘Series’ object is not callable when accessing dtypes of a dataframe
As it is [Duplicate], I have raised this to be removed. Kindly do not rollback. Answer There’s no ambiguity here. file is a dataframe, and dtypes is an attribute. When you access dtypes, a Series is returned: When you call df.dtypes(), you are effectively doing series = df.dtype; series() which is inval…
How to break lines when using wagtail BlockQuoteBlock?
I have this model: When I’m saving page with some text using blockquote I use some line breakes and even <br> tags: But on the page there are no line breaks after it: So how to make this work and save line breaks? I’m using wagtail 1.13.1. Answer I think it was done because of security reaso…
What’s the correct way to check if an object is a typing.Generic?
I’m trying to write code that validates type hints, and in order to do so I have to find out what kind of object the annotation is. For example, consider this snippet that’s supposed to tell the user what kind of value is expected: This should print “value type should be one of (int, str)…
Why do my google tiles look poor in a Cartopy map?
I am a bit puzzled by the rendering of google tiles with Cartopy. The map looks extremely poor compared to the standard google map look. Example (code from https://ocefpaf.github.io/python4oceanographers/blog/2015/06/22/osm/): Generates: Which looks very poor—look at the pixelated rendering of text label and …
Python PIP giving error – “AttributeError: ‘module’ object has no attribute ‘ip_address'”
I am actually having a problem with installing any modules using PIP. Whenever I run PIP like pip install module_name OR sudo pip install module-name ” then it’ll show an error like this:- Importantly:- Reinstalling does nothing Answer I fixed it by using the following commands:
Is there a way to get the error in fitting parameters from scipy.stats.norm.fit?
I have some data which I have fitted a normal distribution to using the scipy.stats.normal objects fit function like so: I would now like to extract the uncertainty/error in the fitted mu and sigma values. How can I go about this? Answer You can use scipy.optimize.curve_fit: This method does not only return t…
LightGBMError “Check failed: num_data > 0” with Sklearn RandomizedSearchCV
I’m trying LightGBMRegressor parameter tuning with Sklearn RandomizedSearchCV. I got an error with message below. error: I cannot tell why and the specific parameters caused this error. Any of params_dist below was not suitable for train_x.shape:(1630, 1565)? Please tell me any hints or solutions. Thank…