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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