temp_update_code.py

#!/usr/bin/env python
#python will ignore this ^ but the shell will not
import os
import subprocess
import glob
import time
from crontab import CronTab

CODE_REPO = os.path.dirname(os.path.abspath(__file__))
DATA_REPO = os.path.join(os.path.dirname(CODE_REPO),"QlabTempData")

def install():
    cron = CronTab(user=True)
    job = cron.new(command = os.path.abspath(__file__))#magic operator for getting the path of the current file
    job.minute.every(60)
    cron.write()

###python git code example####

def run_command(command):
    subprocess.call(command, shell=True)

def git_commit():
    run_command("/usr/bin/git commit -am 'Update data'")

def git_pull():
    run_command("/usr/bin/git pull")

def git_push():
    run_command("/usr/bin/git push")

def update_code():
    os.chdir(CODE_REPO)
    git_pull() # what happens if the code changes?

def update_data():
    append_csv()
    os.chdir(DATA_REPO)
    git_commit()
    git_push()

###python git code example###

current_time = time.strftime("%a, %d %b %Y %H:%M:%S", time.localtime())

def make_csv_line():
    temp_c, temp_f = read_temp()
    return ",".join([current_time, str(temp_c), str(temp_f)])+"\n"

def append_csv():
    with open(os.path.join(DATA_REPO,"temp.csv"), 'a') as f:
        f.write(make_csv_line())


# from https://pimylifeup.com/raspberry-pi-temperature-sensor/
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0] #getting first device that starts with 28
device_file = device_folder + '/w1_slave'

def read_temp_raw():
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines
def read_temp():
    lines = read_temp_raw()
    while lines[0].strip()[-3:] != 'YES': # strip returns a copy of the string with both leading and trailing characters removed
        time.sleep(0.2) #code pauses for this amount of secs
        lines = read_temp_raw()
    equals_pos = lines[1].find('t=')
    if equals_pos != -1:
        temp_string = lines[1][equals_pos+2:]
        temp_c = float(temp_string) / 1000.0
        temp_f = temp_c * 9.0 / 5.0 + 32.0
        return temp_c, temp_f
# Lines[1] means we're looking at the 2nd element in the array,
#in this case, the 2nd line. Once we have the line we simply
#get all the numbers that are after the t= this is done here
#lines[1][equals_pos+2:]. Equals_pos is the start position
#of the temperature (t), and we add 2 to the position, so
#we only get the actual temperature numbers.

def main():
    if os.getenv("install_temp_cron") == "True":
        install()
    update_data()
    update_code()
    #notify_healthcheck()

if __name__ == '__main__':
    main()