How to print out time for every output data

Question

I am trying to retrive my data from a sensor through BeagleBone Black. I got reading and volts, but since I allready use time for time.sleep(). time.sleep() gets syntax error when I try to incorporate start_time.

start_time = time.time()
seconds = (time.time() -start_time)
print('%f\t%f\%s' % (reading, volts, seconds)

This is the code block I try to write.

import Adafruit_BBIO.ADC as ADC
import time

sensor_pin = 'P9_40'

    ADC.setup()
    
    print('Reading\t\tVolts')
    
    while True:
        reading = ADC.read(sensor_pin)
        volts = reading * 1.800
        print('%f\t%f' % (reading, volts)
        time.sleep(0.5)

Why do I get syntax error and is there a better way to add time in seconds? Syntax Error:

File "pulse.py", line 15
    time.sleep(0.5)
       ^
SyntaxError: invalid syntax

Can you post the messages from the SyntaxError that you are seeing? Your `time.time()` usage should not result in an exception. — Aryan Jain, Nov 29 '21 at 22:50
@Diego Say I get a Reading 1 second after I started the script. I want to print out Volt: 1.3 at 1.000 second. — Nicholai Mørch Rindarøy, Nov 29 '21 at 23:01
@Aryan It's the time.sleeps() who gets a syntax error. I was not clear in the text. — Nicholai Mørch Rindarøy, Nov 29 '21 at 23:04
Can you copy the text of the syntax error into your question please? — HPringles, Nov 29 '21 at 23:08

score 3 · Accepted Answer · answered Nov 29 '21 at 23:16

3

Your issue here is that you haven't closed the parentheses () on the line above the time.sleep.

It should read as below

print('%f\t%f' % (reading, volts))

You have the same issue in the print statement you used when calculating the time difference

answered Nov 29 '21 at 23:16

HPringles

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This is considered **old style formatting**: https://realpython.com/python-string-formatting/#1-old-style-string-formatting-operator – Diego Torres Milano Dec 02 '21 at 19:57
It is, yes. However, the post was asking for the reasons behind the syntax error, not about the semantics of the code – HPringles Dec 04 '21 at 15:19

score 2 · Answer 2 · answered Nov 30 '21 at 02:37

2

You can use an f-string literal

print(f'{reading} {volts} {seconds}')

answered Nov 30 '21 at 02:37

Diego Torres Milano

65,697
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How to print out time for every output data

2 Answers2