Question

我的数据类似于以下内容（4列和制表符分隔）：

AAA 123 null    0
AAA 124 null    1
BBB 234 null    0
CCC 235 negative    -2
CCC 345 negative    2
DDD 346 null    -1
EEE 456 positive    4
EEE 457 positive    0

使用这些数据，我需要编写一个条件语句，如果满足Cols 3和4中的两个条件，则单词＆＃34; TRUE＆＃34;在第5栏中打印，如果没有，则单词＆＃34; FALSE＆＃34;打印出来。

试图筑巢＆＃34; IF＆＃34;使用python的语句，我写了以下代码：

with open('infile.input', "r") as opened_file:
    for gLine in opened_file:
        print gLine
        oneID, twoID, oneScore, twoScore = gLine.split()
        if oneScore == "positive" and twoScore > 0:
            if oneScore == "null" and twoScore == 0:
                if oneScore == "neutral" and twoScore == 0:
                    if oneScore == "negative" and twoScore < 0:
                        print oneID, twoID, oneScore, twoScore, "TRUE"
        else:
            print oneID, twoID, oneScore, twoScore, "FALSE"

此代码的结果是＆＃34; FALSE＆＃34;被分配给所有行，如下所示：

AAA 123 null    0   FALSE
AAA 124 null    1   FALSE
BBB 234 null    0   FALSE
CCC 235 negative    -2  FALSE
CCC 345 negative    2   FALSE
DDD 346 null    -1  FALSE
EEE 456 positive    4   FALSE
EEE 457 positive    0   FALSE

。我查看了here和here以获得解决问题的建议，而且代码仅使用一个条件（例如标记所有＆＃39;肯定＆＃39;和＆＃39; x＆gt; ; 0＆＃39;正确为TRUE）。当我添加多个条件时，它无法达到我想要的结果，如下所示：

AAA 123 null    0   TRUE
AAA 124 null    1   FALSE
BBB 234 null    0   TRUE
CCC 235 negative    -2  TRUE
CCC 345 negative    2   FALSE
DDD 346 null    -1  FALSE
EEE 456 positive    4   TRUE
EEE 457 positive    0   FALSE

使用下面的建议，我试图实现这一点，只能正确找到第一个条件的情况。所有其他条件，无论它们是否为真，都标记为假。如何让它识别所有4个条件？

if  ((oneScore == "positive" and twoScore > 0) or
         (oneScore == "null" and twoScore == 0) or
         (oneScore == "neutral" and twoScore == 0) or
         (oneScore == "negative" and twoScore < 0)):
        print oneID, twoID, oneScore, twoScore, "TRUE"
    else:
        print oneScore, twoScore, "FALSE"

Answer 1

听起来你想要or，而不是嵌套的if语句。对于您同时测试的所有条件，它永远不可能实现，因此嵌套的if（在此上下文中类似于and）将永远不会全部通过，让您的代码打印True。

尝试：

if  ((oneScore == "positive" and twoScore > 0) or
     (oneScore == "null" and twoScore == 0) or
     (oneScore == "neutral" and twoScore == 0) or
     (oneScore == "negative" and twoScore < 0)):
    print bookID, ID, oneScore, twoScore, "TRUE"

您twoScore的比较仍然存在问题，因为它会在您split从文件中读取的行之前成为字符串。在进行比较之前，您需要在某个时刻调用int。

Answer 2

这个怎么样：

print bookID, ID, oneScore, twoScore, (oneScore == "positive" and twoScore > 0) \
    or (oneScore == "null" and twoScore == 0) \
    or (oneScore == "negative" and twoScore < 0)

Answer 3

你应该使用if-elif而不是嵌套if if从你的代码中，它永远不会打印＆＃39; TRUE＆＃39;

正确的逻辑应该是这样的

if oneScore == 'positive' and int(twoScore) > 0:
     print bookID, ID, oneScore, twoScore, "TRUE"

elif (oneScore == 'neutral' or oneScore == 'null') and int(twoScore) == 0:
    print bookID, ID, oneScore, twoScore, "TRUE"

elif oneScore == 'negative' and int(twoScore) < 0:
    print bookID, ID, oneScore, twoScore, "TRUE"

else:
    print bookID, ID, oneScore, twoScore, "FALSE"

Answer 4

如下：

twoScore = int(twoScore)
cases = [
    oneScore == "positive" and twoScore > 0,
    oneScore == "null" and twoScore == 0,
    oneScore == "neutral" and twoScore == 0,
    oneScore == "negative" and twoScore < 0
]
state = any(cases) and "TRUE" or "FALSE"

它应该将您的数据与逻辑分离，并简化代码的维护。

在`python`中为同一个变量使用多个条件

4 个答案: