🔒 I need help with my homework(don't get my mistake)

[regal plank]

#queue function

[sterile eagle]

@regal plank

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[regal plank]

Write a signature function scroll(f: ([int], [int])) -> int that returns the value of the element at the head of the queue (i.e. the oldest) and removes it from the queue. If the queue is empty nothing is returned

i wrote this

i don't understand my mistake

[frigid pilot]

!code Please post code, not screenshots of code

[sterile eagle]

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[regal plank]

oh ok

[frigid pilot]

anyway the problem with if not f[0] is that empty lists/tuples/strings are considered Falsy in Python

so that if statement gets executed if f[0] is present but is an empty list (which I guess you don't want?)

in the function, is f the queue?

[regal plank]

yes

is ``

[frigid pilot]

so to test if f is empty, you should just do if not f.

if not f[0] tests the zeroth element of f, it doesn't test f itself

[regal plank]

what about ```
if len(f)=0

[frigid pilot]

to compare values you use ==, not =

other than that, this also works to test for an empty list. although usually in Python we just write if not f as its shorter

[regal plank]

oh okay

thanks

[regal plank]

def defiler(f):
    if f[1]:
        g=f[1].pop()
        return g
    elif f[0]:
        e=f[0].pop(0)
        return e
    else:
        return None

return values are OK but it says incorrect side effect on arguments

[sterile eagle]

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