I'm trying to figure out the solution to this particular challenge and so far I'm stumped.
Basically, what I'm looking to do is:
false exists in string sfalse exists in s, return the boolean TrueHowever, I am not allowed to use any conditional statements at all.
Maybe there is a way to do this with objects?
There is always str.__contains__ if it's needed as a function somewhere:
In [69]: str.__contains__('**foo**', 'foo') Out[69]: True This could be used for things like filter or map:
sorted(some_list, key=partial(str.__contains__,'**foo**')) The much more common usecase is to assign a truth value for each element in a list using a comprehension. Then we can make use of the in keyword in Python:
In[70]: ['foo' in x for x in ['**foo**','abc']] Out[70]: [True, False] The latter should always be preferred. There are edge cases where only a function might be possible.
But even then you could pass a lambda and use the statement:
sorted(some_list, key=lambda x: 'foo' in x) Evaluating condition without using if statement:
True:
>>> s = 'abcdefalse' >>> 'false' in s True False:
>>> s = 'abcdefals' >>> 'false' in s False Return blank if False:
>>> s = 'abcdefals' >>> 'false' in s or '' '' 
'false' in s or None (if 'blank' is None)
__contains__ for completeness because sometimes you cant use a statement somewhere...
falsedoesn't exist ins?