Flag control variable

Tue Feb 11 13:59:46 EST 2014

Op dinsdag 11 februari 2014 19:55:59 UTC+1 schreef Gary Herron:
> On 02/11/2014 10:37 AM, luke.geelen at gmail.com wrote:
>> > well i'm trying something else but no luck :
>> >
>> > #!bin/bash/python
>> > import sys
>> > import os
>> > a = int(sys.argv[1])
>> > sign = (sys.argv[2])
>> > b = int(sys.argv[3])
>> >
>> > if sign == '+':
>> > sum = a + b
>> > print a, sign, b, "=", a + b
>> > command1 = "sudo mpg321 'http://translate.google.com/translate_tts?tl=en&q=%s_plus%s_equals%s'" % (a, b, sum)
>> > os.system (command1)
>> >
>> > elif sign == "*":
>> > sum = a * b
>> > print a, sign, b, "=", a * b
>> > command1 = "sudo mpg321 'http://translate.google.com/translate_tts?tl=en&q=%s_times%s_equals%s'" % (a, b, sum)
>> >
>> > when using * i get
>> >
>> > Traceback (most recent call last):
>> > File "./math+.py", line 6, in <module>
>> > b = int(sys.argv[3])
>> > ValueError: invalid literal for int() with base 10: 'Adafruit-Raspberry-Pi-Python-Code'
>> >
>> > i don't understand why b is a problem, it works fine with +
>>>> Look at the error message. Carefully! It says, quite clearly, the call 
>> to int is being passed a string "Adafruit-Raspberry-Pi-Python-Code", 
>> which of course can't be converted to an integer.
>>>> Now the question is how you ran the program in such a manner that 
>> sys.argv[3] has such an odd value.
>> What does your command line look like? You didn't tell us, but that's 
>> where the trouble is.
>>>> Gary Herron

how do you meen "what does your command line look like?"