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Start your free trialPavlo Vasylyshyn
4,641 PointsOO Python: "Frustration :) task challenge" validation error
Hello,
I didn't want to edit __init__
and my solution works in the Workspaces.
Shell entries:
from ... import Liar
tmp = Liar(1, 2, 3, 4, 5)
len(tmp)
... random number from doubled original len
Task validation throws following exception: "ValueError: empty range for randrange() (1,1, 0)". What am I doing wrong? Thank you
import random
class Liar(list):
def __len__(self):
my_len = super().__len__()
rnd_len = random.randint(1, my_len * 2)
while rnd_len == my_len:
rnd_len = random.randint(1, my_len * 2)
else:
return rnd_len
2 Answers
Chris Freeman
Treehouse Moderator 68,427 PointsYou're on the right path, It's your choice of "lie" can cause an empty range if the initial list has zero length. This causes calling random.randinit(1,0)
which fails. Choosing another "lie" would work, such as, random.randint(my_len, (my_len + 1) * 2)
or simply my_len + 2
Pavlo Vasylyshyn
4,641 PointsWell in this case a simple workaround can be also an "if statement" after requesting original len from super. Something like:
import random
class Liar(list):
def __len__(self):
my_len = super().__len__()
if not my_len > 0:
my_len = 5
rnd_len = random.randint(1, my_len * 2)
while rnd_len == my_len:
rnd_len = random.randint(1, my_len * 2)
else:
return rnd_len
But this is sort of forced fix, since my_len is obviously not assigned as intended. I do not understand how list is passed to the Liar class by the validation script. By the way, correction on my side, in the original post I missed square brackets in this line -> tmp = Liar(1, 2, 3, 4, 5) Thanks, Pavlo