Which of the following is a valid doctest?
Which of the following is a valid doctest?
a.
def add(x, y):
"""Returns sum of two numbers.
"""
>>> add(5, 6)
13
return x + y
b.
def add(x, y):
return x + y
c.
def add(x, y):
"""Returns sum of two numbers.
>>> add(5, 6)
13
"""
return x + y
d.
def add(x, y):
"""Returns sum of two numbers.
add(5, 6)
13
"""
return x + y