I am trying to grasp the idea behind the prefix sum concept looking at the example presented in the Prefix Sum Lesson by Codility here (The mushroom picker problem) My understanding is that the whole concept is based on the simple property where for finding a sum of all elements between two positions A(pos_le…
Tag: python
Can I connect to mysql using Psycopg2 lib
I have a project in python that connects to a postgreSQL database. That project have a module that connects to other data base. The connection string is on a configuration file. I configure it to use a mysql database like this: One running the module I always get the following error: line 179, in connect conn…
Python How to force object instantiation via Context Manager?
I want to force object instantiation via class context manager. So make it impossible to instantiate directly. I implemented this solution, but technically user can still instantiate object. And context manager: Any better solution ? Answer If you consider that your clients will follow basic python coding pri…
What do spaCy’s part-of-speech and dependency tags mean?
spaCy tags up each of the Tokens in a Document with a part of speech (in two different formats, one stored in the pos and pos_ properties of the Token and the other stored in the tag and tag_ properties) and a syntactic dependency to its .head token (stored in the dep and dep_ properties). Some of these tags …
How to find the smallest closest number in a list in python
I want to know how can I find the smallest closest number in a list to a given number. For example: I tried this: The output is 25 and not 15. The problem is that it always gives me the “biggest closest” and not the “smallest closest”. Answer You could make the key also contain the num…
Stop Pandas from converting int to float due to an insertion in another column
I have a DataFrame with two columns: a column of int and a column of str. I understand that if I insert NaN into the int column, Pandas will convert all the int into float because there is no NaN value for an int. However, when I insert None into the str column, Pandas converts all my int to float
Displaying a .txt file in my html using Python Flask
I want to display my log.txt in my log.html. For some reason my page is completely blank. And I dont get to see anything from my file. Code: HTML LOG TEMPLATE: Added my HTML Template now. Answer but really you probably want to use something like logstash…
azure – list containers in python
I’m trying to list the containers under an azure account using the python sdk – why do I get the following? Surely the above is a call to the function and not a reference to the function itself. Answer you get the following according to source code it return ListGenerator(resp, self._list_containe…
How to access an item from S3 using boto3 and read() its contents
I have a method that fetches a file from a URL and converts it to OpenCV image I would like to use boto3 to access an object from s3 bucket and convert it to an image just like above method does. However, I’m not sure how to access an item from a bucket using boto3 and then further how to
How to generate random number in a given range as a Tensorflow variable
I am trying to use the normal distribution to calculate random numbers. but the numbers I get are floating points with many digits after the decimal, like this:0.14845988 Is there a way to make it generate numbers as int, and in a given range like [min, max] ? Answer Updated: Tensorflow >= r2.0 The documen…