command line arguments

TMS

Let's say I want to call one of my modules from the command line, for instance I have this find_root(f,xLo, xHi, eps) assignment I've been working on.

I have the header that looks like this:

Wouldn't that be enough that when I go to a terminal screen (Ubuntu) or console (windows) I could simply type:

find_root.py find_root('x**2 - 2, 0, 3, .0001) and it would work? Assuming that my arguments and the function itself is correct. I'm only looking at the command line arguments right now.

Thank you

Jan 24 '07 #1

bvdet

Let's say I want to call one of my modules from the command line, for instance I have this find_root(f,xLo, xHi, eps) assignment I've been working on.

I have the header that looks like this:

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1. import sys
2.  
3. sys.argv[1,2,3,4]
4.  
5.  

Wouldn't that be enough that when I go to a terminal screen (Ubuntu) or console (windows) I could simply type:

find_root.py find_root('x**2 - 2, 0, 3, .0001) and it would work? Assuming that my arguments and the function itself is correct. I'm only looking at the command line arguments right now.

Thank you

This works at the windows command prompt:

C:\>python find_root.py x**2-4 3 0 0.0001

At the python command line:
Is there another way?

Jan 24 '07 #2

bartonc

This works at the windows command prompt:

C:\>python find_root.py x**2-4 3 0 0.0001

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1. ...function definition....
2.  
3. if __name__ == '__main__':
4.     import sys
5.     find_root(sys.argv[1], float(sys.argv[2]), float(sys.argv[3]), float(sys.argv[4]))
6.  

At the python command line:

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1. from find_root import find_root
2. find_root('x**2-4', 3, 0, 0.0001)

Is there another way?

is not quite complete because errors will be thrown when too few arguments a sent from the command line or if those arguments can't be converted to float. Most command line scripts will provide help when this happens. Elaborate on this idea:

It's a little nicer than showing a python traceback.

Jan 25 '07 #3

TMS

Thank you! Good information.

TMS

Jan 25 '07 #4

bvdet

I have a suggestion for a slight improvement. If you find that you are entering in the same value for 'eps' consistently, add a default to the function argument list: Then the function call could be:

Jan 25 '07 #5