[Tutor] Sys.argv read parameters

[Danilo Chilene]

Hello Dave,

1) I'm using Python 2.7
2) The program wasn't suppose to really work, was just a example.
3) You assumed correct.

That's was what I looking for, worked like charm.

Thanks!


On Wed, Apr 17, 2013 at 5:18 PM, Dave Angel <davea at davea.name> wrote:

> On 04/17/2013 03:27 PM, Danilo Chilene wrote:
>
>> Dear Python Tutor,
>>
>> I have the code below(file.py):
>>
>> import sys
>>
>> a = 'This is A'
>> b = 'This is B'
>> c = 'This is C'
>>
>> for i in sys.argv[1]:
>>      if sys.argv[1] == 'a':
>>          print a
>>      if sys.argv[1] == 'b':
>>          print b
>>      if sys.argv[1] == 'c':
>>          print c
>>
>
> Since this is a loop, I'll assume that argv[1] was supposed to permit
> multiple characters.  If so, your loop is buggy.  And if not, then you
> don't want a loop.
>
>
>
>> I run python file.py a and returns the var a, so far so good.
>>
>
> What do you want to happen if you say
>       python file.py  ac
>
>
>
>
>> The problem is that i have a bunch of vars(like a to z), how I can handle
>> this in a pythonic way?
>>
>>
> Use a dictionary (dict).  Instead of separate 'variables' use one dict.
>  (With version 2.7)
>
> import sys
>
> mystrings = { "a" : "This is A",
>               "b" : "This is B",
>               "c" : "This is C",
>               "d" : "This is some special case D",
>             }
>
> for parm in sys.argv[1]:
>     if parm in mystrings:
>         print mystrings[parm]
>     else:
>         print "Invalid parm"
>
> If this isn't what you wanted, then you'll have to make it clearer.
>
> 1) tell us what version of python
> 2) supply us with a non-buggy program,
> 3) be much more specific about what change you want.  You don't want more
> vars, you presumably want a way to avoid having more vars.  Danny assumed
> you wanted those exact strings, for a, b, and c, while i assumed that those
> were just simple examples.
>
>
> --
> DaveA
>
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