刚刚学Python，不知道哪里出了错，小伙伴可以帮我看看嘛？੭ ᐕ)੭*⁾⁾

Question

Answer 1

x = eval(input('请输入一个x'))
if x < 0:
    y = 0
elif 0 <= x < 5:
    y = x
elif 5 <= x < 10:
    y = 3 * x - 5
elif 10 <= x < 20:
    y = 0.5 * x - 2
else:
    y = 0

print(y)