代码未检测到文件中的正确数量

Question

除了一小部分之外，我的代码一般都可以正常工作。在下面给出的文件中，程序应该输出红色或硬肉的安全动物的数量。它应该是 8，但我得到 5。我将如何解决这个问题？相关摘录如下。谢谢。

文本文件：

#color     size     flesh     class
brown     large    hard      safe
green     large    hard      safe
red       large    soft      dangerous
green     large    soft      safe


red       small    hard      safe
red       small    hard      safe
brown     small    hard      safe
green     small    soft      dangerous
green     small    hard      dangerous
red       large    hard      safe
brown     large    soft      safe
green     small    soft      dangerous
red       small    soft      safe
red       large    hard      dangerous
red       small    hard      safe
green     small    hard      dangerous

还有代码：

for line in infile:
    if line[0] != '#':
        data = line.strip().split()

        if data:
           animals = animals + 1

            if data[3] == 'dangerous':
                dangerous = dangerous + 1
            elif data[3] == 'safe' and data[1] == 'large':
                large_safe = large_safe + 1
            elif data[0] == 'brown' and data[3] == 'dangerous':
                brown_dangerous = brown_dangerous + 1                        
            elif (data[3] == 'safe') and (data[0] == 'red' or data[2] == 'hard'):
                safe_red_hard = safe_red_hard + 1



    print("Total animals: "+ animals + "\n")
    print("Dangerous: "+ dangerous + "\n")
    print("Brown and dangerous: "+ brown_dangerous + "\n")
    print("Large and safe: "+ large_safe + "\n")
    print("Safe and red color or hard flesh: "+ safe_red_hard + "\n")

Answer 1

主要问题在于elif 语句：

elif data[3] == 'safe' and data[1] == 'large':
    large_safe = large_safe + 1
elif data[0] == 'brown' and data[3] == 'dangerous':
    brown_dangerous = brown_dangerous + 1                        
elif (data[3] == 'safe') and (data[0] == 'red' or data[2] == 'hard'):

按照这个逻辑，任何大而安全的动物都永远不能算作安全、红色或硬。解决方案是改用if 语句：

animals = 0
large_safe = 0
dangerous = 0
brown_dangerous = 0
safe_red_hard = 0
with open('file') as infile:
    for line in infile:
        if line[0] == '#':
            continue
        data = line.strip().split()
        if data:
            animals = animals + 1
            if data[3] == 'dangerous':
                dangerous = dangerous + 1
            if data[3] == 'safe' and data[1] == 'large':
                large_safe = large_safe + 1
            if data[0] == 'brown' and data[3] == 'dangerous':
                brown_dangerous = brown_dangerous + 1________________________
            if (data[3] == 'safe') and (data[0] == 'red' or data[2] == 'hard'):
                safe_red_hard = safe_red_hard + 1

print("Total animals: "+ str(animals) +"\n")
print("Dangerous: "+ str(dangerous) +"\n")
print("Brown and dangerous: "+ str(brown_dangerous) + "\n")
print("Large and safe: "+ str(large_safe) + "\n")
print("Safe and red color or hard flesh: "+ str(safe_red_hard) + "\n")