Python 3.3 includes in its standard library the new package venv. What does it do, and how does it differ from all the other packages that match the regex (py)?(v|virtual|pip)?env? Answer This is my personal recommendation for beginners: start by learning virtualenv and pip, tools which work with both Python …
Run interactive Bash with popen and a dedicated TTY Python
I need to run an interactive Bash instance in a separated process in Python with it’s own dedicated TTY (I can’t use pexpect). I used this code snippet I commonly see used in similar programs: But when I run it I get the following output: Strace of the run shows some errors: The code snippet seems…
How do I upgrade to Python 3.6 with conda?
I want to get the latest version of Python to use f-strings in my code. Currently my version is (python -V): How would I upgrade to Python 3.6? Answer Anaconda has not updated python internally to 3.6. a) Method 1 If you wanted to update you will type conda update python To update anaconda type conda update c…
Plot elapsed time on x axis using date indexed time-series data
In my pandas dataframe, my time series data is indexed by absolute time (a date of format YYYY-MM-DD HH24:MI:SS.nnnnn): How can I plot this data such that the x-axis of my plots is an increasing value of some interval of seconds (e.g, “0 10 20 30 40 50”) relative to the timestamp of my first sampl…
NameError: name ‘request’ is not defined
I got this Python Code, and somehow I get the Error Message: But I really can’t find my mistake. Can someone please help me with that? Answer You appear to have forgotten to import the flask.request request context object:
How to detect and draw contours using OpenCV in Python?
I wrote the following code to detect and draw contours: And here is the error I received: Traceback (most recent call last): File “C:/Users/R.K.singh/Desktop/Image processing/intro-to-contours.py”, line 10, in contours,hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE); Val…
What do the functions tf.squeeze and tf.nn.rnn do?
What do the functions tf.squeeze and tf.nn.rnn do? I searched these API, but I can’t find argument, examples etc. Also, what is the shape of p_inputs formed by the following code using tf.squeeze, and what is the meaning and case of using tf.nn.rnn? Answer The best source of answers to questions like th…
Visual Studio Code – How to add multiple paths to python path?
I am experimenting with Visual Studio Code and so far, it seems great (light, fast, etc). I am trying to get one of my Python apps running that uses a virtual environment, but also uses libraries that are not in the site-package of my virtual environment. I know that in settings.json, I can specify a python.p…
How can I get a list of removable drives plugged in the computer?
I would like to get a list of the removable drivers that are plugged in to the computer. I think it can be done by using some registry, but I don’t know how exactly. If there is another way I would like to hear about it. Note: It’s important that I will be able to separate the removable drives fro…
Flask app getting error of “could not locate flask application. …..FLASK_APP environment variable” for Flask Migrate
I have a file db_table.py that looks like: When I try to run: I get: I tried first manually setting FLASK_APP var, by doing set FLASK_APP=app.py then running flask db init again, but that didn’t resolve the issue. Answer The flask command line argument needs to know what module to locate the current Fla…