Re: [Tutor] Is there a way to store and later use comparison operators (<, <=, =, >=, >) ?

[Mark Lawrence]

On 29/04/2015 21:10, boB Stepp wrote:
Python 2.4.4, Solaris 10.
I have some functions that I believe I could collapse into a single
function if I only knew how:

def choose_compare(operator, value0, value1, pass_color, fail_color):
     """
     Perform the comparison indicated by operator. Return pass_color if
true, fail_color if false.
     """
     if operator == '<':
             return less_than(value0, value1, pass_color, fail_color)
     elif operator == '<=':
         return less_than_or_equal(value0, value1, pass_color, fail_color)
     elif operator == '=':
         return equal(value0, value1, pass_color, fail_color)
     elif operator == '>':
         return greater_than(value0, value1, pass_color, fail_color)
     elif operator == '>=':
         return greater_than_or_equal(value0, value1, pass_color, fail_color)
     else:
         print 'WarningMessage = "Invalid comparison operator in
function, choose_compare().@Please contact script administrator for
assistance.";'

def less_than(value0, value1, pass_color, fail_color):
     """
     See if value0 is less than value1. If true, return pass_color. If
false, return fail_color.
     """
     if value0 < value1:
         return pass_color, True
     else:
         return fail_color, False

def less_than_or_equal(value0, value1, pass_color, fail_color):
     """
     See if value0 is less than or equal to value1. If true, return
pass_color. If false, return fail_color.
     """
     if value0 <= value1:
         return pass_color, True
     else:
         return fail_color, False

... 3 more functions ...

I won't give the remaining functions for the other comparison
operators. The string variable, operator, is originally populated from
a data file, which tells what type of comparison needs to be made. The
last two functions I gave (and the ones I omitted giving) all follow
the same exact pattern. I know there has to be some way to replace
these 5 functions with 1, but what experimentation I have done to date
has not worked.

Also, what about the first function above? I could use 2 dictionaries,
1 for calling the 5 functions and one to pass the arguments, but is it
worth doing this? Or, I would not be surprised if there is a much
better way! ~(:>))

Thanks!


This isn't a job for Bicycle Repair Man!!!  It smacks to me of 
dictionaries and the operator module but I'm too bone idle to look it up 
myself, so try here https://docs.python.org/3/library/operator.html
D'oh :)

--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence

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