[Tutor] Why do I not get the same results for these two functions when I pass 7 as an argument?

[Nonso Ibenegbu]

Great! Many thanks for the help offered. The background of the problem is
that if I book a certain service for 1 or 2 days I pay $40 per day, if I
book 3,  4, 5 or 6 days I get $20 off but if I book above 7 days I get $50
off.

The first function does the job!

The second function breaks down when the argument is 7 or above.

Yet the only difference is that the condition "if days >= 7:" comes first
in the first function but comes second (as "elif days >= 7:") in the second
code.

I think essentially that the difference lies in the fact that the
conditions were swapped. But how are they different?


On Fri, May 3, 2013 at 8:07 AM, Mark Lawrence <breamoreboy at yahoo.co.uk>wrote:

> On 03/05/2013 07:10, Nonso Ibenegbu wrote:
>
>> Hello everyone,
>> Wonder if someone can help me understand why these two codes do not give
>> the same results for what looks essentially the same ("?") code. The
>> argument passed is
>> 7.
>>
>> def rental_car_cost(days):
>>      payment = days * 40
>>      if days >= 7:
>>          return payment - 50
>>      elif days >= 3 < 7:
>>          return payment - 20
>>      else:
>>          return payment
>>
>> and...
>>
>> def rental_car_cost(days):
>>      payment = days * 40
>>      if days >= 3 < 7:
>>          return payment - 20
>>      elif days >= 7:
>>          return payment - 50
>>      else:
>>          return payment
>>
>>
> Python comparisons are chained.  days >= 3 < 7 is saying "days is greater
> or equal to 3 and 3 is less than 7".  You need 3 <= days < 7.
>
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>
> Mark Lawrence
>
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