I must be doing something stupid but I just don't see it. I could not get the following simple code to work.
>>> def a_bigger_than_b(a,b):
... 'Yes' if a > b
File "<stdin>", line 2
'Yes' if a > b
^
SyntaxError: invalid syntax
def a_bigger_than_b(a,b):
... return 'Yes' if a > b else 'No!'
Actually your using it as Ternary Operator in such case you need else
i think you must give else this can be well understood by
first
c='Yes' if a > b
what will be the value for a if a is smaller than b this case is ambiguous so else is must
correct syntax
c='Yes' if a > b else 'No!'
A detailed explanation was given by here
*On 9/29/2005, Guido decided to add conditional expressions in the
form of "X if C else Y".
The motivating use case was the prevalance of error-prone attempts
to achieve the same effect using "and" and "or".
Previous community efforts to add a conditional expression were
stymied by a lack of consensus on the best syntax. That issue was
resolved by simply deferring to a BDFL best judgment call.*
if without else but there is no need to have it in a one-liner.
if in the ternary operator and the if as control statement. In the latter case, of course you can omit the else.Your syntax resembles me a bit of Perl.
I am not sure what exactly you want
def a_bigger_than_b(a,b):
'Yes' if a > b
to do; there are several possimble interpretations.
Amongst the ones already mentioned, you could as well want
def a_bigger_than_b(a, b):
if a > b: return 'Yes'
which does nothing in the <= case and eventually reaches the end of the function, where (implicitly) None is returned.
This is the one-liner syntax for Python, quite equvalent to the do_whatever if foo syntax in Perl.
Be aware that a function must always return a value; if you don't explicitly, None is returned implicitly.
You may change if statement in simpler one:
def a_bigger_than_b(a, b):
return a > b and 'Yes'
False is returned if a <= b.
False, eg. a > b and 'Yes' or 'Noooo'a if b else c is leaner than b and a or c. If a is a false value, you get c although b is true. (As said, that doesn't apply here, as 'Yes' is true.)