I’m using Node-Red, hosted on a Raspberry Pi for an IoT project. How do I trigger a Python script that is on the raspi from Node-Red? I want to run a script that updates the text on an Adafruit LCD shield which is sitting on the Pi Should I be looking to expose the Python script as a web service
Tag: python
PySpark, importing schema through JSON file
tbschema.json looks like this: I load it using following code Why does the schema elements gets sorted, when I want the elements in the same order as they appear in the JSON. The data type integer has been converted into StringType after the JSON has been derived, how do I retain the datatype. Answer Why does…
python re.sub newline multiline dotall
I have this CSV with the next lines written on it (please note the newline /n): I am trying to delete all that commas and putting the address one row up. Thus, on Python I am using this: As far as I know, re.multiline and re.dotall are necessary to fulfill /n needs. I am using re.compile because it is the
Python: Print a variable’s name and value?
When debugging, we often see print statements like these: How can write a function that will take a variable or name of a variable and print its name and value? I’m interested exclusively in debugging output, this won’t be incorporated into production code. Answer You can just use eval: Or more ge…
how to multiply pandas dataframe with numpy array with broadcasting
I have a dataframe of shape (4, 3) as following: I want to multiply each column of the dataframe with a numpy array of shape (4,): In numpy, the following broadcasting trick works: However, it doesn’t work in the case of pandas dataframe, I get the following error: Any suggestions? Answer I find an alte…
How to retrieve steam market price history?
I’m trying to get price history for items on steam market. I found a link that returns price history for a specific item (which is mentioned in almost every question about getting price history from market at this site). http://steamcommunity.com/market/pricehistory/?country=PT¤cy=3&appid=…
BeautifulSoup – search by text inside a tag
Observe the following problem: For some reason, BeautifulSoup will not match the text, when the <i> tag is there as well. Finding the tag and showing its text produces Right. According to the Docs, soup uses the match function of the regular expression, not the search function. So I need to provide the …
How can I compare files quicker in Python?
Is there any way to make this script faster? I’m using one file to compare another file to print lines, if second column are equal. Input example (for both files): The command line below works equally for same purpose in bash: How can I improve this Python script? Answer If you store your lines in dicti…
PyCharm can’t find reference in PyGame __init__.py?
OK, I’m very new to coding, and I am just learning Python. I figured I would start with some basic Pygame exercises to try to have something to program. I’ve installed Python 3.4.3 and PyCharm. I also installed the Pygame executable “pygame-1.9.2a0-hg_5974ff8dae3c+.win32-py3.4.msi” from here: https://bitbucke…
Django – When button is clicked I want to change the dictionary content
On my html page I have a button, and a number being displayed. I want the number to increase by 1 every time the button is pressed. This is the code that I have so far, but for some it doesn’t work. mypage.html views.py Answer On every request a new instance of the python script is run which would resul…