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.

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19k views

How to install Python 3.7 with SSL? [closed]

I have compiled and installed Python 3.7 on my Raspberry Pi, but SSL is not working. These are the steps I took to install the new Python: Prerequisites: $ sudo apt-get update $ sudo apt-get ...
8
votes
1answer
12k views

Python script fails with 'ImportError' when run from rc.local

So I've tested that my script does attempt to run and I'm recording the error message of Traceback (most recent call last): File "/home/pi/steamFriendStatus_v0.3.py", line 6, in <module> ...
7
votes
5answers
14k views

Failed to create MMAL component b'vc.ril.camera': Out of memory

I am trying to run a simple script that listens for a button click and then takes a picture. Once two pictures have been taken it compares the two using OpenCV to calculate the difference. I am ...
7
votes
2answers
13k views

How can I use OpenCV with Python 3 on a Raspberry Pi?

I have installed OpenCV and and access it with Python 2. However, I'm unable to use OpenCV with Python 3. It says "Cannot open shared object". ImportError: libQTtest.so.4: cannot open shared object ...
6
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4answers
7k views

Do we need multiple versions of Python?

I am new to Linux and going through my installed folder I can see there are four different Python folders in the directory list. python python2.7 python3 python3.2 Do we need all the four versions ...
6
votes
2answers
13k views

How fast can GPIO pins toggle?

I'm currently using Python's RPi.GPIO module to toggle some pins, and I want to know how quickly it can do this. I need the pins to be toggled on the schedule of a ~50 mhz FPGA clock, which I'm ...
5
votes
3answers
849 views

Is it necessary to release Raspberry Pi Camera before rebooting? If so how do I do it?

I have a python3 script that uses OpenCV and a Raspberry Pi cam. It runs almost 24/7. Using crontab the pi will reboot every night at midnight and the script will begin running again. This is mostly ...
4
votes
3answers
331 views

Raspberry Pi Cluster for Computation

I am new to Raspberry Pi's (as well as this stackexchange) and would like to use them to learn how to build a small cluster. (Currently using this guide: https://medium.com/@glmdev/building-a-...
4
votes
3answers
4k views

Launch a GUI Tkinter program on boot

I am trying to auto launch a Tkinter/Python program when the Raspberry Pi boots up. Ideally I would like to boot the Pi into the console and then launch a GUI Tkinter Python program. In testing – not ...
4
votes
1answer
3k views

Installing libraries via pip is taking forever. Raspberry pi 3b+

I tried to install scipy using pip3 install scipy as well as sudo pip3 install scipy and it got stuck at Building wheel for scipy for 45 minutes. Same is the case for cython. What is the fix or it ...
4
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2answers
3k views

Selenium won't run on my raspberry pi 3 Model B+

Today I recieved my Raspberry pi 3 Model B+. I downloaded NOOBS and installed it on my raspberry pi. However, I cannot run a selenium browser on it. I have tried to install iceweasel but it says that ...
4
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1answer
10k views

How to fix Remote I/O Error Whilst Using i2c OLED

I was using my i2c OLED perfectly well when seemingly for no reason I started getting the Remote I/O Error when I ran my Python program. For some reason this was fixed by installing i2c tools again. ...
4
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2answers
6k views

Raspberry Pi 3B+ freezes randomly

General setup My RPi is connected to a mouse, keyboard, and monitor. My swap size is set to 1000 MB and I'm not using wifi. Problem The RPi freezes randomly, meaning the GUI is frozen, no SSH ...
4
votes
3answers
13k views

I can't download PyCharm for Raspberry Pi 3

I have had my raspberry Pi 3b for a few months so I'm just getting used to it. I would however want to install PyCharm because I want to use my Pi to program on rather than my PC. Any ideas would be ...
3
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1answer
323 views

Open a Folder in the File Manager by a Python Script

I would like to open a specific folder (not a file) in the file manager by pushing a button in a Tkinter frame. Does anyone know the function?
3
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2answers
3k views

How to automatically rerun python script if error occurs

I have python script which ideally runs indefinitely in loop. I am catching some exceptions, however, the problem is when some error occurs and script stops because of error. I want to detect somehow ...
3
votes
2answers
2k views

I want to run a Python 3 script on startup and in an endless loop on my Raspberry Pi

I have created a smart vending machine using my Raspberry Pi. For now, I open the Raspberry Pi using SSH and run the script manually for every transaction. I want to automate the process and run the ...
3
votes
2answers
40 views

Executing 2 commands in 2 different Terminal windows

I want to execute 2 python programs(both run flask servers on different ports) in 2 different terminal windows, from a single bash script. Python files: a.py and b.py Bash Script: runner.sh This is ...
3
votes
3answers
27k views

How to connect MySQLdb in Python 3?

I want to connect MySQLdb with Raspberry Pi. But when running my program, I get this error: $ sudo python3 readMQ2sql.py Traceback (most recent call last): File "readMQ2sql.py", line 17, in <...
3
votes
2answers
5k views

Select default Python as 3.7.2

I had installed Python 3.7 which according to tutorial in this blog(i change the Python version to 3.7.2): https://bohdan-danishevsky.blogspot.com/2017/01/building-python-360-on-raspberry-pi-3.html ...
3
votes
2answers
9k views

Pip3 install throwing error on raspberry pi 3 Raspbian-Jessie

I am trying to install a python 3 library on a raspberry pi 3 running Raspbian-Jessie. sudo pip3 install LIBRARY However, regardless of what library I try to install, I am getting this error: ...
3
votes
3answers
3k views

Is it ok to remove all Python?

I have a Raspberry Pi 3 Model B and I installed Raspbian on it using NOOBS. I want to use Python 3.6 only. Is it ok if I uninstall both Python 3.5 and 2.7? Will there be no system problems? If I yes, ...
3
votes
1answer
2k views

Upgrading to Latest Numpy Version on Raspberry Pi 3

I'm not sure if this is a Raspberry Pi issue, Raspbian Issue, Python Issue, or all of the above. So forgive me if this is the wrong place to ask this. I just got me a Raspberry Pi 3B+ and installed ...
3
votes
1answer
730 views

Turn Up or Down Volume for OMXPlayer 3.5mm Audio Jack

on my raspberry pi i have a speaker wired connected via aux cable to the 3.5mm audio jack. My first question ishow can i get rid of the noise coming out of my 3.5mm audio jack when keys are pressed or ...
3
votes
1answer
6k views

Saving graphs using Matplotlib is very slow

I am trying to write a python Code snippet which creates 24 figures and 9 subplot and saves them in the directory. Its taking around 197 sec to create all the 24 figures and save them. This is ...
3
votes
1answer
89 views

Raspberry Pi Zero W serial communication

I just got a RPI zero w and I want to communicate to a device through serial comm. I also have a MAX232 board and a RS232 TTL converter. I want to use one of this boards to be able to communicate with ...
3
votes
0answers
661 views

Accelerated Numpy on Pi 3 B+

I'm looking to do some work with NumPy on my Pi 3 B+, and I'm not sure what the deal is with optimization, blas, etc. I installed libatlas using: sudo apt-get install libatlas-base-dev Following ...
2
votes
3answers
5k views

Reinstalling Python3

I purged all the python3 packages and when I try to install python3 again on my raspbian I get this: Setting up python3.5-minimal (3.5.3-1) ... # Empty sitecustomize.py to avoid a dangling symlink ...
2
votes
2answers
76 views

Can I use the Python Interpreter to list a modules' classes and methods, as well as descriptions? [closed]

I believe there is documentation available online, but for the sake of learning a little more about the interpreter, I am specifically wondering if I can use it to find out what is all available for ...
2
votes
2answers
558 views

How does Raspbian know it's been installed in a Pi or Compute Module?

I want to design a python script that would allow me to check whether it's currently in a standard Pi 3 or it's in a Compute Module 3. But I have no idea even on how Raspbian OS know itself is ...
2
votes
3answers
2k views

no module named 'speech_recognition'

I installed speech recognition pip install SpeechRecognition ran this import speech_recognition as sr r = sr.Recognizer() with sr.Microphone() as source: audio = r.listen(source) print(r....
2
votes
4answers
82 views

Why is my relay switching on automatically when I start my program?

I'm building a little automated hydroponics system using a raspberry pi zero, a 5 volt relay, a pump and a soil moisture sensor from adafruit. So far everything is working, I can pull the pin to high ...
2
votes
1answer
422 views

5v/12v power source/submersible water pump/RPI/relay. What kind of combination is suitable?

I am using a 12v DC water pump with a 20 l/min flow rate, a raspberry pi 3B and a distance sensor. I would like to use a relay and an external power supply to control turning on/off the water pump. so ...
2
votes
3answers
3k views

Python3.7 with Numpy on Raspbian

Goal: Install Python3.7 on the Raspberry Pi. Then install Numpy for Python3.7 Found this very useful Github Gist: https://gist.github.com/SeppPenner/6a5a30ebc8f79936fa136c524417761d Ran the ...
2
votes
1answer
455 views

Access wpa_supplicant inside docker

How can I access wpa_cli inside a docker? I want to connect to wifi from inside a docker in Pi 3. For that I am using wpa_cli. But when I run wpa_cli inside the docker I get following error: Could ...
2
votes
1answer
1k views

Is there a problem with using deprecated os.popen?

I'm using os.popen() to run terminal commands in multiple projects. I keep reading that os.popen() is deprecated though and I should use Popen() instead, but I haven't been able to get Popen() to ...
2
votes
2answers
277 views

How can Rpi4B select multiple ADS1115 ADCs using PCA9546 / TCA9548A I2C multiplexer?

I have a PCA9546 i2c multiplexer hook to my raspberry pi under it are 4 ads1115 i2c ADC. My first main problem is how do you switch the address of the i2c in python the sample code that i have seems ...
2
votes
2answers
552 views

Does gpiozero need RPi.GPIO?

I'm trying out gpiozero, but after running the examples from their documentation, I still get this errors but it still runs ok. gpiozero is installed on venv using pip3 #!/usr/bin/env python from ...
2
votes
2answers
332 views

Can't exit my apllication in a clean way

Not sure if my problem is related to RaspberryPi, GPIO or just my understanding of Python but since I'm detecting my problem while playing with a button attached to my PI I ask it here. I have a ...
2
votes
1answer
3k views

how to install protobuf in raspberrypi3 b+ stretch?

Anyone can suggest me how to install protobuf in raspberrypi 3 b+. if I directly install using the command pip install protobuf it is install but I am not able to import ?
2
votes
1answer
1k views

Python 3 interpreter not recognizing a new installed package(python 3.5.3)

I'm new to this RPI world and also to python although I completed the basic courses I'm still getting used to this so I will appreciate your patience I'll try to express my self the best way. I ...
2
votes
5answers
17k views

How do I connect GSM SIM 900A to a Raspberry Pi 3?

I want to connect the GSM SIM 900A to a Raspberry Pi 3 but I don't where the problem is. I used this configuration: https://qph.fs.quoracdn.net/main-qimg-c124f9e741afd438969e869e52d0df6b Then I ...
2
votes
1answer
40 views

To perform only one task

How can we prioritize raspberry-pi3b+ model so that if my "code on python" is running then the raspberry-pi should not perform any other task in background. Since i have to calculate time taken by my ...
2
votes
1answer
35 views

apt-get update - trying to install python OpenCV on rasp pi?

$ apt-get update Reading package lists... Done E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied) E: Unable to lock directory /var/lib/apt/lists/ W: Problem unlinking ...
2
votes
1answer
388 views

Raspberry pi 3 RFID RC522 Card UID is not same with USB RFID Reader

I'm working with RFID RC522 using Raspberrypi 3B+. I'm following https://github.com/mxgxw/MFRC522-python this package and works like a charm. I can able to read the data from the card, able to write ...
2
votes
1answer
192 views

GY-291 / ADXL345 weird sensor reading for x, y, z

I've two identical GY-291 / ADXL345 sensors. To read the data I use the python-module (https://pypi.org/project/adxl345/). i2cdetect detects the sensors at address x53 correctly. Unfortunately, data ...
2
votes
1answer
578 views

Use matplotlib on Raspbberrypi

Using The following Code for saving plot locally on raspberry: from numpy import genfromtxt import matplotlib.pyplot as plt import plotly.io as pio y = range(10) x = range(10) plt.title("Adc data") ...
2
votes
1answer
678 views

Capture image when camera is not covered

I am very new to R Pi, but I know my Python. I am working on a project where I have an always running camera, that is kept in dark. What I need to do is to capture an image when there is light. (lets ...
2
votes
1answer
792 views

Best Python 3.5 library for playing mp3 file on Raspberry pi 0 W

I've already tried VLC library but the cpu reach 100% usage frequently during file playing, I've also the necessity to track the state of the playing so to know when the file is ended etc., Any ideas?
2
votes
1answer
46 views

While loop bahaviour with rgb LED

I'm comfortable with the physical side of circuitry etc but a total newbie at python so I've been messing around with a Raspberry Pi 4B and python 3 to help me understand how to control various ...

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