如果数字9在输入数组的前4位数字中，则应返回True。阵列长度可能小于4。
为什么此循环不起作用？在某些测试案例中，它仅返回True和False。
def array_front9(nums):
for num in nums:
first4 = nums[0:4]
if num in first4 and num == 9:
return True
else:
return False
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You don't need a
forloop since theinoperator would iterate through the characters of a string for you. You should also compare a string to a string, rather than a number, which would never be equal to a string: