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up vote 2 down vote favorite

I know how to pass arguments into a shell script. These arguments are declared in AWS datapipeline and passed through. This is what a shell script would look like:

firstarg=$1
secondarg=$2

How do I do this in Python? Is it the exact same?

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Have you tried to search before you asked? Searching google for passing arguments to python script brings all information you need. As the 4th link I got the question Command Line Arguments In Python from Stackoverflow. – Piotr Dobrogost Oct 23 '15 at 16:36
up vote 4 down vote accepted

This worked for me:

import sys
firstarg=sys.argv[1]
secondarg=sys.argv[2]
thirdarg=sys.argv[3]
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Yep, that works. For some reason, indexing does not start at 0. So sys.argv[0] is equal to nothing – simplycoding Oct 20 '15 at 16:52
    
argv[0] should be the script name – Peter Gerhat Oct 20 '15 at 16:54
up vote 0 down vote

You can use the argv from sys 

from sys import argv
arg1, arg2, arg3, ... = argv

You can actually put an abitrary number of arguments in the command line. argv will be a list with the arguments. Thus it can also be called as arg1 = sys.argv[0] arg2 = sys.argv[1] . . .

Keep also in mind that sys.argv[0] is simply the name of your python program. Additionally, the "eval" and "exec" functions are nice when you use command line input. Usually, everything in the command line is interpreted as a string. So, if you want to give a formula in the command line you use eval().

>>> x = 1
>>> print eval('x+1')
2
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