How to turn variable true and false using function?

[Ofnuts]

You can't because Boolean variables are immutable. If you need a function to change the value variable, use a return statement, and assign the return value to the variable.

def longerThatFive(s):
   return len(s)>5

t1=longerThanFive('abc')
t2=longerThanFive('abcdef')

print t1,t2