I am using pyspark under ubuntu with python 2.7 I installed it using And trying to follow the instruction to setup spark cluster I can’t find the script start-master.sh I assume that it has to do with the fact that i installed pyspark and not regular spark I found here that i can connect a worker node t…
Tag: python
Convert datetime to time in python
I have: and then use: which gives me How do I just get: 10:30:00 as type datetime.time? Answer You can use the strftime method of the datetime object like this: More information here: https://docs.python.org/2/library/datetime.html#strftime-strptime-behavior Ok, I misunderstood. Use day.time() to get a time o…
Python: Maximum Subarray Sum
I’ve just tried to start learning Python today, so I am not knowledgeable when it comes to it’s functions. However, I found the maximum subarray problem, and wanted to try and solve it with the few, simple logical commands I have at my disposal. I have gotten stuck, and am almost certain the probl…
How to prevent directory traversal attack from Python code
I need to prevent from directory traversal attack from my code using Python. My code is below: Here I need user is running like http://127.0.0.1:8000/createfile/?param=../../../../../../../../etc/passwd this it should prevent the directory traversal attack. Answer Suppose the user content is all located in En…
Python pandas – new column’s value if the item is in the list
I want to create a new column in pandas dataframe. The first column contains names of countries. The list contains countries I am interested in (eg. in EU). The new colum should indicate if country from dataframe is in the list or not. Below is the shortened version of the code: The error I get is: ValueError…
Jupyter – Split Classes in multiple Cells
I wonder if there is a possibility to split jupyter classes into different cells? Lets say: For more complex classes its really annoying to write them into one cell. I would like to put each method in a different cell. Someone made this this last year but i wonder if there is something build in so i dont need…
Spotify authorization code (not access token) is expiring – how can I circumvent this?
I am developing an app that creates a public Spotify playlist for a user who has given proper authorization to do so. I am using Flask and Python requests library to accomplish this, but after I’ve sent a few consecutive POST requests to get an access token from Spotify (using authorization code obtaine…
Passing C++ vector to Numpy through Cython without copying and taking care of memory management automatically
Dealing with processing large matrices (NxM with 1K <= N <= 20K & 10K <= M <= 200K), I often need to pass Numpy matrices to C++ through Cython to get the job done and this works as expected & without copying. However, there are times when I need to initiate and preprocess a matrix in C++ a…
python: class vs tuple huge memory overhead (?)
I’m storing a lot of complex data in tuples/lists, but would prefer to use small wrapper classes to make the data structures easier to understand, e.g. would be preferable over however there seems to be a horrible memory overhead: and Why? is there any obvious alternative solution that I didn’t th…
How to fix “elasticsearch.exceptions.AuthenticationException: … missing authentication token for REST request”?
I am working on using an ElasticSearch database to store data I am pulling from online. However, when I try to index the data in the database I receive an error. Here is my code for creating and indexing the data: However when I run this program, the second of those lines causes an error, here is the complete…