Strange (for a newbie) problem

[Angelo Secchi]

I'm experiencing the following problem.
I have a python script analyses.py where a certain point I have to
define a variable called 'code' like:

code=151

The program works fine but if I change that line in 'code=sys.argv[1]'
using the sys module in order to give to the program that code as a
parameter (i.e. I then run this script as "python analyses.py 151" from
the shell) then the program returns an error complaining that a certain
variable different from code is not defined.

What is my mistake?
Thanks
angelo

 

[Peter Otten]

What is my mistake?

You didn't provide actual code and the traceback.

Peter

PS: Just a guess: code = int(sys.argv[1]) might work

 

[Josiah Carlson]

I'm experiencing the following problem.

I have a python script analyses.py where a certain point I have to
define a variable called 'code' like:

code=151

The program works fine but if I change that line in 'code=sys.argv[1]'
using the sys module in order to give to the program that code as a
parameter (i.e. I then run this script as "python analyses.py 151" from
the shell) then the program returns an error complaining that a certain
variable different from code is not defined.

What is my mistake?

Depending on where 'code = sys.argv[1]' is placed, this could be your
problem.

Another thing to note is that everything in sys.argv is a string. Try
using the following:

code = 151
if len(sys.argv) > 1:
try:
code = int(sys.argv[1])
except:
pass


- Josiah

 

[Alan Gauld]

I have a python script analyses.py where a certain point I have to
define a variable called 'code' like:

code=151

The program works fine but if I change that line in 'code=sys.argv[1]'
using the sys module in order to give to the program that code as a
parameter (i.e. I then run this script as "python analyses.py 151" from
the shell) then the program returns an error complaining that a certain
variable different from code is not defined.

What is my mistake?

Dunno. You need to give us more information. Without seeing where
the error occurs, how the other variable is both defined and
used, we cannot guess what you might be doing! Well, we could
guess but its not likely to be very profitable!

Alan G.
Author of the Learn to Program website
http://www.freenetpages.co.uk/hp/alan.gauld

 

[wes weston]

Angelo,
Yes, more info is needed. One thing that could move
your error to a latter line and confuse you is that you
can "multiply" strings.
<type 'str'>

wes

I'm experiencing the following problem.
I have a python script analyses.py where a certain point I have to
define a variable called 'code' like:

code=151

The program works fine but if I change that line in 'code=sys.argv[1]'
using the sys module in order to give to the program that code as a
parameter (i.e. I then run this script as "python analyses.py 151" from
the shell) then the program returns an error complaining that a certain
variable different from code is not defined.

What is my mistake?
Thanks
angelo

 

[Angelo Secchi]

Thanks Alan, Peter, Wes and Josiah.
Noting that sys.argv[1] was a string solved the problem!!!
Sorry...
angelo

Angelo,
Yes, more info is needed. One thing that could move
your error to a latter line and confuse you is that you
can "multiply" strings.
<type 'str'>

wes

I'm experiencing the following problem.
I have a python script analyses.py where a certain point I have to
define a variable called 'code' like:

code=151

The program works fine but if I change that line in
'code=sys.argv[1]' using the sys module in order to give to the
program that code as a parameter (i.e. I then run this script as
"python analyses.py 151" from the shell) then the program returns an
error complaining that a certain variable different from code is not
defined.

What is my mistake?
Thanks
angelo

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Angelo Secchi PGP Key ID:EA280337
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Graduate Fellow Scuola Superiore S.Anna
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