Questions tagged [python-3]
Use this tag when referring to the Python 3 language. This can include discussions about specific features unique to the language or perhaps when referring to software that requires Python 3 in order to function. Note that general programming questions are often better suited to Stack Overflow; use this tag only where directly relevant to the Pi.
451
questions
1
vote
1answer
35 views
Install pypy3 on raspberry pi
I found this to try to help me install pypy3
https://stackoverflow.com/questions/55703832/install-pypy3-on-raspberry-pi
However the download command no longer works. I tried:
sudo apt-get install ...
0
votes
2answers
53 views
Unable to run bash after boot
I have a raspberry pi 4, EDIT: using python3.7, with raspbian OS Devian 10 Buster and I am trying to run a script afeterboot for people counting, it uses a virtual env, after reading various post this ...
0
votes
1answer
27 views
Rerun the code if error occurs
I am fairly new to coding so please bear with me. I am using random.choice for my code to run.
So, sometimes it gives me an error 'Cannot choose from an empty sequence' and sometimes it does not.
Now, ...
0
votes
0answers
24 views
I am having trouble with my print command showing “area_room at 0x0000012B26AC88B0” instead of the value of the funtion [closed]
def c_price():
Premium = float(36.00)
High = float(21.35)
Basic = float(9.32)
def area_room():
width = input("What is the Width of the room: ")
height = ...
0
votes
0answers
16 views
Real time treshold crossing on slow signal
I need to acquire an analog signal at a slow sample rate (~100 Hz) with ADC connected to Raspberry pi4 with SPI protocol. I've written a Python routine which should detect a real time treshold ...
0
votes
1answer
31 views
Real time + High frequency ADC data reading with Raspberry Pi 4
I need to acquire a signal at a minimum sample rate of 10 kHz and processing it real-time using a Python code. Since Raspberry Pi only reads digital signals I get an ADC (High Precision AD/DA Board ...
0
votes
0answers
37 views
RTSP streaming works in VLC media player but not in Python OpenCV
I have Logitech C920 USB webcam connected to my rPi 4 4GB model. I want to stream the video feed through rtsp. The following command runs on the pi:
cvlc -v v4l2:///dev/video0:chroma=mp2v --v4l2-width ...
0
votes
0answers
31 views
breaking out of while loop
Trying to stop a light blinking "while" loop by querying the position of a gamepad joystick. Can't seem to continuously query while in the loop and break out of the inner loop. Can you ...
1
vote
0answers
22 views
Connecting a phone to a Pi 3A+ using Bluetooth fails
I want to connect my phone using BLE to a Pi 3A+.
For testing I have set up a Bluetooth server using this code.
I have tried connecting with nRF Connect on both a Motorola Moto e5 (Android 8.0) and a ...
-1
votes
0answers
47 views
ImportError cannot open shared object file: no such file or directory
I'm on a raspberry pi vm in virtualbox and I'm trying to run some code but I get an import error using tensorflow. I've looked around but I'm not quite sure how to solve this. The package seems to be ...
0
votes
0answers
12 views
Display monitor closes while running a python code on Rpi zero
I am writing a code using the Google AIY vision kit and its APIs. I have a loop which calls the face_detection model continuously every 30 secs. The loop works perfectly fine for the first 2 ...
1
vote
1answer
112 views
Can't install python packages & pip module not found
I've been trying to install packages on a raspberry pi 4b and I keep having issues.
On the default, python ver. 3.7, I would get setup.py not found.
Then I installed python ver. 3.9 and got the ...
1
vote
1answer
36 views
Waveshare AD/DA espansione board setting sampling frequency
In order to acquire 3 analog signals with Raspberry pi 4 I want to use ADS1256 Waveshare's AD expansion board ( 8 channels single-ended, 24 bit). I was wandering if there's a way to set a different ...
0
votes
2answers
45 views
How should I upgrade the version of Python to latest release [closed]
I would like to re-bind Apache fCGI to python3.7 instead of Python2.7. I saw the following error message while my script used type-hinting.
AH00163: Apache/2.4.38 (Raspbian) mod_fcgid/2.3.9 mod_wsgi/4....
0
votes
0answers
19 views
Program stops running while accessing MongoDB in python program triggered using udev rules
I have udev rules file to run a program on usb mount. I am running a bash script automount.sh when USB is connected to Pi.
#! /bin/sh
cd
cd /root
chmod 777 /media/USB
chmod 777 create_report.py
...
0
votes
0answers
22 views
pyvisa with raspberry pi get Exception: failed to set configuration [Errno 16] Resource busy
I'm trying to comunicate with USB signal generator using pyvisa
import pyvisa
rm = pyvisa.ResourceManger()
dev = rm.open_resource('USB::13062::68:1106200007::INSTR')
unfortunately i get an exception :...
0
votes
0answers
16 views
Python GTK application on raspbian lite
I run raspbian lite because I don’t need the complete desktop environment. Actually I like to run my GTK application from the command line. I was trying to install xorg. It does not run...
I need some ...
1
vote
2answers
61 views
How to measure raspberry pi energy consumption through programs
Is any Device available in the market that can measure the raspberry pi energy consumption and has a mechanism to read that information from my own program?
I explored the specifications of USB meter ...
0
votes
0answers
40 views
Writing software for the RPi without hardware (Mocking/Stubbing)
I have an IoT project that uses the Pi Zero W and at some point want to utilize the compute modules for industrial application. Currently, doing dev I may use a RPi 3/4 to copy files across and run ...
0
votes
1answer
102 views
pygame.error: Unable to open a console terminal
In a .py file this line states "screen = pygame.display.set_mode ( (1, 1) )". It yields an error "error code in python--pygame.error: Unable to open a console terminal". Can ...
0
votes
0answers
24 views
Kivy popup with incorrect graphics
I could not find anything related so I posted the same question on stackexchange to reach a wider range of experts on the matter. On Raspberry Pi4 with Raspbian GNU/Linux 10 (buster) I have Kivy setup ...
-1
votes
1answer
34 views
Odd results when using RPi.GPIO's event_detected() function
I've recently been experimenting with RPi.GPIO's event_detected() function, to check if a button (connected to the gpio) has been presssed. However, for some reason events would randomly be detected. ...
0
votes
1answer
22 views
python modual problem with terminal
I have written this program in python:
print("CC ACTIVATED")
import lcddriver
import time
import subprocess
from datetime import datetime
from pydub import AudioSegment
from pydub.playback ...
-1
votes
1answer
49 views
Install Pytorch to RPi (x86? arm?)
I recently study about running some Deep Learning codes on RPis(Rpi 3) so I tried to install Pytorch 1.4.0 on them.
However It is quite tough job to do as you may know.
I'm so sick of installing ...
-1
votes
2answers
60 views
Keyboard with rc.local
I Have written this python program for my pi.
print("CC ACTIVATED")
import lcddriver
import time
import subprocess
display = lcddriver.lcd()
try:
display.lcd_display_string("CC... &...
0
votes
1answer
28 views
Why can I run a python script accessed per php file that is accessed per cmd WHILE I can't run the same thing accessed per browser?
Hello ladys and gentlemen :)
I got a python script py.py that switches a GPIO (works perfectly when accessing per cmd line).
I got a php file php.php in which I access the py.py file (works perfectly ...
0
votes
1answer
40 views
How to reshape the output stream of the script to make it work for a cvlc stream using Python?
stream.py needs to be changed:
import sys
import cv2
from picamera.array import PiRGBArray
from picamera import PiCamera
import time
RES_W = 640
RES_H = 480
camera = PiCamera()
camera.resolution = (...
1
vote
1answer
28 views
Run a subprocess in administrator mode
I'm trying to add a wifi network on the raspberry pi via bash inside a python script.
I want to run a subprocess in administrator mode inside a python application, does anyone have any suggestions to ...
-1
votes
1answer
57 views
Compile exe for Windows using Wine [closed]
I'm trying to use Wine on my RP4 to compile a script as a Windows Executable. Unfortunately I'm not able to install Python 3 on Wine.
I could not find any guide on installing python in wine on a RP ...
1
vote
1answer
40 views
RGB LED - Only first color activates when multiple colors are called
I have one RGB LED (common anode type), and while I can get every color to light up independently I am seeing some bizarre behavior when trying to combine colors. This is my first project involving ...
0
votes
1answer
73 views
Run python script on startup and wait for keyboard input [closed]
I know, I know, it looks like the 1000th question about the same thing, but I have tried almost every answer I came across here about running scripts on startup, but they fail to meet my particular ...
1
vote
1answer
57 views
How to reduce the polling frequency of the w1-gpio module on an Raspberry Pi?
I would like to know how to influence the polling frequency of a device on the w1-gpio module.
The reason is because I have a DS18B20 temperature sensor on a Raspi that reads too hot.
The first thing ...
0
votes
0answers
34 views
Load cell changing over time
I'm using a 1kg load cell beam (see example at bottom) connected to a HX711 board then connected to the Raspberry GPIO.
I'm running this Python3 code: https://github.com/gandalf15/HX711/blob/master/...
0
votes
0answers
47 views
How to quit an automatically run script on startup in Python Kivy?
I run a script at startup with the command line @lxterminal -e /home/pi/Desktop/Python3/myApp.sh in the file /home/pi/.config/lxsession/LXDE-pi/autostart which I created with nano, not with sudo nano ...
0
votes
1answer
17 views
Can't append python prints to a file if the .py program is running in the background
I have a Raspberry Pi Zero WH. I wrote a python program
import time
while True:
print("test")
time.sleep(2)
At the system prompt,
/usr/bin/python3 test.py
prints fine to the screen.
/...
2
votes
1answer
7k views
Updating Python 3.7 to 3.8 [closed]
I recently updated my Raspberry Pi with sudo apt update and sudo apt full-upgrade to the system. Even if Python 3.8 is out, when I run python3 in terminal, it shows me version 3.7, instead of 3.8.
Why ...
1
vote
0answers
40 views
How to make python3 aware of manually compiled opencv?
all this is on a 4Gb RPi 4GB. I compiled opencv from source following this guide and it built and compiled ok. Running opencv_version reports 4.4.0-dev. But in python3 when running import cv2 it says:
...
0
votes
1answer
70 views
Converting from RPi.GPIO to circuit python digitalio
I didn't write this code (just made some modifications) but it was using a depreciated library so I'm trying to update to the official circuit python libraries and update everything for python3.
This ...
0
votes
0answers
23 views
How to control GPIO pins using python CGI library
I am trying to create a web app with python cgi, cgitb libraries that would be able to interact with the GPIO pins. The application has an html form with a textbox and a submit button. The script can ...
0
votes
1answer
125 views
raspberry pi captive portal
I have created a python flask script that runs on my raspberry pi, I have also configured rpi to switch to access point so when my laptop/mobile gets connected to the AP, I can navigate to the IP '192....
0
votes
1answer
57 views
Wierd output in python from serial connection output
Output:
b'00000-000000\r\n'
b'450302198011281530\r\n'
b''
b''
b'+\x00--To--\r\x12-\x00000800\r\x12-\x00000800\r\x12'
b'-\x00000800\r\x12-\x00000800\r\x12'
b'-\x00000800\r\x12-\x00000800\r\x12'
...
0
votes
0answers
69 views
vlc python does not play a video in hdmi2
I want to run a video in my second monitor/projector using vlc pip3 install python-vlc and python3 in Raspberry Pi 4.
I set the Fullscreen Video Device to HDMI-2 Tools --> Preferences --> Video -...
1
vote
1answer
99 views
Connecting an Arduino Nano to a Raspberry Pi using Serial Cable on an a Pi 3B+ or Zero W
I wanted to connect an Arduino Nano to either my Pi 3B+ or my Zero W preferably my Zero. When I connected my Nano to my Pi Zero and ran a simple script with the python 3 serial library, it didn't work....
0
votes
0answers
71 views
“wlan0: carrier lost” untimtly WiFi deconection on raspberry pi 3b+ and pi0 W
I am facing this bug since few days.
I am using: Rpi 3b+ or Rpi0W, Buster-lite with last update, Kernel : 4.19.118+
I using Ubiquti WiFi AP and dnsmasq for managing the lan, both working normally with ...
0
votes
1answer
121 views
No module named 'gi'
Recently i have installed Altinstall Python 3.8.0 in /usr/bin. However when i try to from gi.repository import GLib i get:
ModuleNotFoundError: No module named 'gi'
I have tried many ways (...
0
votes
1answer
36 views
Calculate Accurate Distance Traveled with GPS in Python [closed]
I am trying to update distance traveled between GPS coordinates. My error is that the GPS can move short distances while sitting still. I am currently simply adding the new coordinates to a list every ...
0
votes
0answers
54 views
I2C, SPI and Python Libraries with Raspberry Pi 4b
I've been working with RPi.GPIO so far but I have had issues with PWM and edge detection, which are well known issues with RPi.GPIO, anyway, after some research I'm considering using a different ...
0
votes
0answers
29 views
Playing videos based on GPIO input Python
I am making a Raspberry Pi(with model 3B) video player that pays a video when an button(from GPIO) is RELEASED.
So what I would like to do is when a button is released the video would play. And when ...
1
vote
3answers
74 views
Running Toy Motor circuit with Pi's 5v
I am currently going through the tutorials included with those kits that you can get for the Pis with breadboards and components, etc. Anyway, in the tutorial, I am making the following circuit:
In ...
0
votes
1answer
38 views
raspberry pi access point status
I have created an access point on my raspberry pi, now I wish write a python program to check if an access point has been created or not? is it possible to know through command line or python library....
