Re: Importing functions that require parameters
- From: Peter Otten <__peter__@xxxxxx>
- Date: Mon, 10 Dec 2007 14:49:14 +0100
Matt_D wrote:
import sys
import otp_encrypt
the_key = opt_encrypt.get_key(sys.argv[1])
If that isn't what you want, you'll need to explain the sentence that
starts "Now I understand", with examples of what you have tried.
When I try:
from otp_encrypt import get_key
I get:
-----------------------------------------------
IndexError Trace
C:\WINDOWS\system32\<ipython console> in <modul
Q:\python\my pys\otp_encrypt.py in <module>()
62 cipher += letter
63 return cipher
64
---> 65 print final(sys.argv[1])
66
IndexError: list index out of range
In [13]: from otp_encrypt import get_key()
I know why I'm getting the error -- I'm importing a function from a
module in iPython with a sys.argv parameter. No big mystery there.
No you don't know -- you are trying to use a module that is meant to work
as a stand-alone script as a library. As a python module is executed when
it is imported, so is the print statement in line 65. To prohibit execution
of the script-only parts use an if-suite, e. g.:
def get_key(...):
# ...
if __name__ == "__main__":
print final(sys.argv[1])
Now the print statement will be executed if you invoke your script from
the command line
$ python otp_encrypt.py
but not by
import otp_encrypt
where the value of __name__ is "otp_encrypt".
Peter
.
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