What is the output of the following Python code?
def my_dec(func):
def wrapper(a, b):
return func(a, b) + 10
return wrapper
@my_dec
def add(a, b):
return a + bprint(add(3, 4))
add(3, 4) calls wrapper(3, 4) which returns add(3, 4) + 10 = 7 + 10 = 17.
What keyword is used in a function to transform it into a Generator function?
The presence of yield inside a function definition makes it a generator function, returning a generator iterator when called.
Evaluate the output:
def gen():
yield 1
yield 2
yield 3
$g = gen()
print(next(g) + next(g) \cdot 10)$
First next(g) yields 1. Second next(g) yields 2. Calculation: 1 + 2 * 10 = 21.
What exception is raised when a generator or iterator has no more items to yield during a next() call?
When an iterator/generator runs out of values, next() raises StopIteration, which for loops handle automatically.
What is the output of:
def fib_gen(limit):
a, b = 0, 1
while a < limit:
yield a
a, $b = b, a + b
print(sum(fib_gen(10)))$
Fibonacci numbers < 10 are: 0, 1, 1, 2, 3, 5, 8. Sum = 0 + 1 + 1 + 2 + 3 + 5 + 8 = 20.