One feature I have been struggling to implement in flask-admin is when the user edits a form, to constrain the value of Field 2 once Field 1 has been set. Let me give a simplified example in words (the actual use case is more convoluted). Then I will show a full gist that implements that example, minus the &#…
How to include two pictures side by side in Markdown for IPython Notebook (Jupyter)?
I am trying to insert two pictures side by side in one Markdown cell on a notebook. The way I do it was: in order to be able to size the included picture. Can anyone gives suggestions on top of this? Thanks, Answer JMann’s solution didn’t work for me. But this one worked I took the idea from this …
Convenient way to wrap long SQL statements in javascript
In python, one can use “”” to wrap long MySQL statements. For example, However, if I try the same thing in javascript, there will be syntax error. Is there some kind of javascript equivalent for python’s “””string encapsulation? If no, what are some best practices for…
Memoization using dictionary
So I am trying to implement Lowest common subsequence in Python and was trying this alternative to my previous solution. I tried using a dictionary instead of a 2-D matrix to memoize the results. It’s returning which I understand is because I am not returning anything so how can I do something like this…
Pandas dataframe from nested dictionary
My dictionary looks like this: I want to get a dataframe that looks like this: I tried calling pandas.from_dict(), but it did not give me the desired result. So, what is the most elegant, practical way to achieve this? EDIT: In reality, my dictionary is of depth 4, so I’d like to see a solution for that…
timedelta error with numpy.longdouble dtype
I have times with dtype numpy.longdouble and when I’m trying to use that values with timedelta function I’ve got errors. But when I convert it to numpy.float64 everything is fine. Could somebody explain that behaviour? When I’m trying to see dtypes of variables they are look the similar but …
How to download a file over HTTP with multi-thread (asynchronous download) using Python 2.7
I have a file to download (download path extracted from json. eg: http://testsite/abc.zip). I need a help to perform, all the 5 threads should download the abc.zip file to the output directory and the download has to be Asynchronous or concurrent. Currently with the below code it does download the file 5 time…
how to put an Item in aws DynamoDb using aws Lambda with python
Using python in AWS Lambda, how do I put/get an item from a DynamoDB table? In Node.js this would be something like: All I need is the python equivalent. Answer Using Boto3 (Latest AWS SDK for python) You import it with Then call the client via Get item example Put item example ‘S’ indicates a Str…
when installing pyaudio, pip cannot find portaudio.h in /usr/local/include
I’m using mac osx 10.10 As the PyAudio Homepage said, I install the PyAudio using the installation of portaudio seems successful, I can find headers and libs in /usr/local/include and /usr/local/lib but when I try to install pyaudio, it gives me an error that actually it is in /usr/local/include why can…
Making a collatz program automate the boring stuff
I’m trying to write a Collatz program using the guidelines from a project found at the end of chapter 3 of Automate the Boring Stuff with Python. I’m using python 3.4.0. Following is the project outline: Write a function named collatz() that has one parameter named number. If the number is even, t…