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?
asked Oct 20, 2015 at 16:44
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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 DobrogostOct 23, 2015 at 16:36
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7Searching google for passing arguments to python script brings this post.– Davide AndreaSep 11, 2017 at 22:44
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1So recursion works– Vadim YangunaevMay 15, 2020 at 6:16
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3 Answers
This worked for me:
import sys
firstarg=sys.argv[1]
secondarg=sys.argv[2]
thirdarg=sys.argv[3]
answered Oct 20, 2015 at 16:48
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Yep, that works. For some reason, indexing does not start at 0. So
sys.argv[0]is equal to nothing Oct 20, 2015 at 16:52 -
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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
import sys
# Display File name
print("Script name ", sys.argv[0])
# Display the first argument
print(f"first arg {sys.argv[1]}")
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1
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