Syntax error in python script of raspberry pi

Question

I'm new in python and total stranger to python indentation. I get syntax error whenever I try to run the following code, what is the problem with it? Thanks already.

#!/usr/bin/python

import RPi.GPIO as GPIO
import time

def RC_Analog (Pin):  
 counter = 0  
 # Discharge capacitor  
 GPIO.setup(Pin, GPIO.OUT)  
 GPIO.output(Pin, GPIO.LOW)  
 time.sleep(0.1)  
 GPIO.setup(Pin, GPIO.IN)  
 # Count loops until voltage across capacitor reads high on GPIO  
 while(GPIO.input(Pin)==GPIO.LOW):  
  counter =counter+1  
 return counter  

# Set up header pin 11 as an input
triggerPin = 25;
echoPin = 8;
GPIO.setmode(GPIO.BCM)
GPIO.setup(triggerPin, GPIO.OUT)
GPIO.setup(echoPin, GPIO.IN)

while True:
 GPIO.output(triggerPin, False)
 time.sleep(0.000002)
 GPIO.output(triggerPin, True)
 time.sleep(0.00001)
 GPIO.output(triggerPin, False)
 print RC_Analog(echoPin)/58
 time.sleep (0.25)

If it literally prints def?RC_Analog(Pin), it sounds like you have something other than a space between the def and the RC_Analog, maybe some weird Unicode character which is similar to a space. — Aya
– Aya, Commented Apr 20, 2013 at 14:05

Thierry Lathuille · Accepted Answer · 2013-04-20 14:21:15Z

1

Are you really using python to launch your script ? I can get an error at the same place if I try to source it as a shell script:

. test.py

Make sure you launch it with python:

python test.py

or make it executable: chmod u+x test.py and launch it with: ./test.py

answered Apr 20, 2013 at 14:21

Thierry Lathuille

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1 Comment

mozcelikors Over a year ago

your answer is useful, but nothing i didnt already do. thanks anyway. The problem was with the utf-8 whitespace thing, it turned out.

Aya · Accepted Answer · 2013-04-20 15:21:38Z

1

def?RC_Analog(Pin) it highlights the question marked area

If you see the code as def RC_Analog(Pin), but the syntax error message literally prints def?RC_Analog(Pin), it sounds like you have something other than an ASCII space character between the def and the RC_Analog, like a Unicode non-breaking space, or some other Unicode character which is similar to a space.

Replacing it with a space typed from your keyboard should solve the problem.

When writing a Python script, it's best to ensure you only use the 7-bit ASCII character set. Some text editors will let you set this in a configuration option, others will let you choose an encoding when saving.

If you're using Windows Notepad, select type "ANSI" when saving.

edited Apr 20, 2013 at 15:21

answered Apr 20, 2013 at 15:07

Aya

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Comments

Johnny · Accepted Answer · 2013-04-20 14:00:55Z

0

If you get

ImportError: No module named RPi.GPIO

you need to install the module first

https://pypi.python.org/pypi/RPi.GPIO

answered Apr 20, 2013 at 14:00

Johnny

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3 Comments

Ashwini Chaudhary Over a year ago

ImportError is different from SyntaxError.

Neil Forrester Over a year ago

Well in John Brown's defense, you are being pretty vague about exactly what error you're getting.

mozcelikors Over a year ago

I know but as i said, im new to it, so i dont know what information else should i provide, the only information shell gives to me is that there is a syntax error.

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