I need to create a function called compress that compresses a string by replacing any repeated letters with a letter and number. My function should return the shortened version of the string. I’ve been able to count the first character but not any others. Ex: Answer Here is a short python implementation of a compression function: Here are a few
Disable/Remove argument in argparse
Is it possible to remove or disable an argument in argparse, such that it does not show in the help? How? It is easy to add new arguments: And I know you can override arguments with a new definition by specifying the “resolve” conflict handler: But this still includes arg1 in the help message and results of parse_args Is there
How to add a constant column in a Spark DataFrame?
I want to add a column in a DataFrame with some arbitrary value (that is the same for each row). I get an error when I use withColumn as follows: It seems that I can trick the function into working as I want by adding and subtracting one of the other columns (so they add to zero) and then adding
Celery – No module named five
After updating celery and django-celery to 3.1: I run into this error when starting my server: Using: Django 1.4.21 Python 2.7 Answer Last version of vine is 5.0.0 and fresh push was in 06.09.2020 (yesterday) :), and this version do not have any five.py file. So downgrade vine version to. vine==1.3.0 works for me UPDATE: by the answer Sarang, amqp
How does the functools cmp_to_key function work?
In Python, both list.sort method and sorted built-in function accepts an optional parameter named key, which is a function that, given an element from the list returns its sorting key. Older Python versions used a different approach using the cmp parameter instead, which is a function that, given two elements from the list returns a negative number if the first
Python – How to break word into 64bit chunks
I am doing an assignment where I have to institute the Diffie-Hellman key exchange. In order to speed things up I am using bit-operators in Python, and everything is working fine programming wise, but I have to perform a Parity Checksum, and I don’t think I have the proper understanding of what this is or how it works. Basically I
Web scraping a text() in python
I am having trouble with a web scraping function. The XPath for the two things I am trying to get are The html is I am trying to have a function to loop through each li in tr[5]. The problem I am having is getting the text(). I have tried a number of different variations of this function This specific
Combine (join) networkx Graphs
Say I have two networkx graphs, G and H: What is the best way to join the two networkx graphs? I’d like to preserve the node names (note the common nodes, 2 to 7). When I used nx.disjoint_union(G,H), this did not happen: The H node labels were changed (not what I want). I want to join the graphs at the
Override S3 endpoint using Boto3 configuration file
OVERVIEW: I’m trying to override certain variables in boto3 using the configuration file (~/aws/confg). In my use case I want to use fakes3 service and send S3 requests to the localhost. EXAMPLE: In boto (not boto3), I can create a config in ~/.boto similar to this one: And the client can successfully pick up desired changes and instead of sending
Imputation of missing values for categories in pandas
The question is how to fill NaNs with most frequent levels for category column in pandas dataframe? In R randomForest package there is na.roughfix option : A completed data matrix or data frame. For numeric variables, NAs are replaced with column medians. For factor variables, NAs are replaced with the most frequent levels (breaking ties at random). If object contains