CODEWITHSUNDEEP
python
James K J
James K J

Reputation: 129

Is there any difference between statement 1 and statement 2

statement 1 : `

self.__hours == 0 if self.__hours == 23 else self.__hours=+1

statement 2 :

       if self.__hours == 23 : 
        self.__hours == 0 
       else :
         self.__hours += 1

Is it just the styling or anything else ?

Upvotes: 1

Views: 178

Answers (2)

William Jackson
William Jackson

Reputation: 1165

Setting syntax errors aside, the spirit of your two statements are generally equivalent. The first is a "conditional expression" (also called a "ternary expression").

self.__hours = 0 if self.__hours == 23 else self.__hours + 1

You are setting self.__hours to something -- either 0 or self.__hours + 1 -- depending on the current value of self.__hours.

The equivalent if statement would be:

if self.__hours == 23:
    self.__hours = 0
else:
    self.__hours = self.__hours + 1

(self.__hours = self.__hours + 1 can also be replaced with self.__hours += 1.)

Upvotes: 0

bgporter
bgporter

Reputation: 36474

In general, they're going to provide equivalent answers and be interchangeable.

One obvious difference between the two forms is that the ternary form can be used in places where an expression can be used as the body of a lambda, while the second one can't:

>>> x = lambda y: 0 if y > 0 else -1
>>>
>>> x(1)
0
>>> x(-1)
-1

or 

>>> def fn(val):
...    print val
...
>>> y = 2
>>> fn(0 if y > 0 else -1)
0

Upvotes: 1

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