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POcrontab with sudo python script
 

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    <p>Alright, I've found something. Not sure how to tackle it. I've seen that this is a common error that comes up in google. The error seems to have something to do with the environment variables or something. Not sure how to handle this:</p> <p>This is the code and it's the part where subprocess is called that leads to the error:</p> <pre><code>#!/usr/bin/python import subprocess import re import sys import time import datetime import gspread # =========================================================================== # Google Account Details # =========================================================================== # Account details for google docs email = 'my_email@gmail.com' password = 'my_password' spreadsheet = 'my_spreadsheet' # =========================================================================== # Example Code # =========================================================================== # Login with your Google account try: gc = gspread.login(email, password) except: print "Unable to log in. Check your email address/password" sys.exit() # Open a worksheet from your spreadsheet using the filename try: worksheet = gc.open(spreadsheet).sheet1 # Alternatively, open a spreadsheet using the spreadsheet's key # worksheet = gc.open_by_key('0BmgG6nO_6dprdS1MN3d3MkdPa142WFRrdnRRUWl1UFE') except: print "Unable to open the spreadsheet. Check your filename: %s" % spreadsheet sys.exit() # Continuously append data while(True): # Run the DHT program to get the humidity and temperature readings! output = subprocess.check_output(["./Adafruit_DHT", "2302", "17"]); print output matches = re.search("Temp =\s+([0-9.]+)", output) if (not matches): time.sleep(3) continue temp1 = float(matches.group(1)) temp = temp1*9/5+32 # added the extra step to converto to fahrenheit # search for humidity printout matches = re.search("Hum =\s+([0-9.]+)", output) if (not matches): time.sleep(3) continue humidity = float(matches.group(1)) print "Temperature: %.1f F" % temp print "Humidity: %.1f %%" % humidity # Append the data in the spreadsheet, including a timestamp try: values = [datetime.datetime.now(), temp, humidity] worksheet.append_row(values) except: print "Unable to append data. Check your connection?" sys.exit() # Wait 30 seconds before continuing or just exit print "Wrote a row to %s" % spreadsheet # time.sleep(60) sys.exit() </code></pre> <p>that's basically it. It works fine using 'sudo python script.py' as long as the Adafruit_DHT program is in the same directory.</p> <p>Here's the error I get:</p> <pre><code>Traceback (most recent call last): File "/home/pi/Adafruit/dht/Ada_temp.py", line 44, in &lt;module&gt; output = subprocess.check_output(["./home/pi/Adafruit/dht/Adafruit_DHT", "2302", "17"]); File "/usr/lib/python2.7/subprocess.py", line 537, in check_output process = Popen(stdout=PIPE, *popenargs, **kwargs) File "/usr/lib/python2.7/subprocess.py", line 679, in __init__ errread, errwrite) File "/usr/lib/python2.7/subprocess.py", line 1259, in _execute_child raise child_exception OSError: [Errno 2] No such file or directory </code></pre> <p>I've tried adding the full path of the c program (Adafruit_DHT), to no avail...</p>
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    1. COYou should see errors in `/var/log/syslog`. Is there any?
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      1. UStwil
    2. CODoes your script not run at all, or it runs but does not write to the google spreadsheet?
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      1. USVerma
    3. COWhat user is cron running as? Is it in sudoers? Could you wrap the python script in a bash script that calls sudo?
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      1. USAdam Benzan
 

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