Python
tracking bugs in complex systems ..
Some weeks ago I’ve replaced the case of the ‘catcam’. A Raspberry Pi 3 which was running for 1.5 years without interruption with the nice script & python-upload triggered by a cronjob. And now the device freezes. Still running, but neither accessible via SSH nor VNC (of course, if SSH is not working ..).
I left the case open; removed the camera; upgraded kernel and Raspbian: nothing helped.
My last guess is that the camera stopped working. But to be sure I want to let the RPi3 long-time with temperature-logging. So … we need a simple program:
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import os import time def measure_temp(): temp = os.popen("vcgencmd measure_temp").readline() return (temp.replace("temp=","")) while True: print(time.ctime() + " ## " + measure_temp()) time.sleep(1) |
executed like this, because else the output is buffered up to 4 or 8 kByte:
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$ stdbuf -oL python temperature.py > worstLoggingEver.txt |
and the content of the textfile is something like:
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Tue Mar 6 22:52:59 2018 ## 51.5'C Tue Mar 6 22:53:00 2018 ## 52.1'C |
CodeCombat: learning Python the cute way
I am currently trying to enhance my skills by learning Python. I made a choice between Ruby and Python after I was quite frustrated sometimes while writing the contactSheet-script. Bash is missing some general debug-abilities (or I don’t know them ;)) and the way to control the code-/data-flow was quite limited from my POV. I came from high level-strong typed-precomiled C++ and then hit bash ..
CodeCombat is a browser-only, completely OpenSource “game” where you lead your protagonist through its adventures by using code-snippets. One after another simple and more complicated statements are introduced, control structures like loops and alternatives follow. You can chose between different languages – besides Python also JavaScript is available.
It is quite amusing to guide the hero(ine). I finished already 22 levels.
For in detailed explainations I stick to: “Learn Python the hard way“