2

我需要查看列表中的 2 个项目是否出现在另一个列表中,如果出现,请按它们在另一个列表中的位置比较这些项目。伪代码示例:

j=0
for x in mylist #loop through the list
    i=0
    for y in mylist #loop through the list again to compare items
        if index of mylist[j] > index of mylist[i] in list1 and list2:
            score[i][j] = 1 #writes the score to a 2d array(numpy) called score
            i=i+1
        else: 
            score[i][j]=0
            i=i+1
j=j+1

示例叙述描述:

Names = [John, James, Barry, Greg, Jenny]
Results1 = [James, Barry, Jenny, Greg, John]
Results2 = [Barry, Jenny, Greg, James, John]

loop through Names for i
    loop through Names for j
        if (index value for john) > (index value for james) in results1 and 
           (index value for john) > (index value for james) results2:
            score[i][j] = 1

有人可以指出我正确的方向吗?我一直在查看大量列表、数组和 .index 教程,但似乎没有任何内容可以回答我的问题

4

3 回答 3

3

将您转换list2为对给定项目的位置进行编码的字典:

dic2 = dict((item,i) for i,item in enumerate(list2))

现在,您可以通过使用x in dic2 and y in dic2和使用dic2[x]来测试列表中的某些内容,以获取它在列表中的索引。

编辑:这违背了我更好的直觉,但这是完整的代码。第一部分是使用我上面展示的内容,将一个简单的列表转换为索引查找。接下来是初始化 2D 列表的标准方法,如果不直观的话。接下来是你的循环,使用方便的enumerate函数为列表中的每个名称分配一个索引。

Names = ['John', 'James', 'Barry', 'Greg', 'Jenny']
Results1 = ['James', 'Barry', 'Jenny', 'Greg', 'John']
Results2 = ['Barry', 'Jenny', 'Greg', 'James', 'John']

Order1 = dict((name,order) for order,name in enumerate(Results1))
Order2 = dict((name,order) for order,name in enumerate(Results2))

score = [[0]*len(Names) for y in range(len(Names))]

for i,name1 in enumerate(Names):
    for j,name2 in enumerate(Names):
        if name1 in Order1 and name2 in Order1 and Order1[name1] > Order1[name2] and name1 in Order2 and name2 in Order2 and Order2[name1] > Order2[name2]:
            score[i][j] = 1
于 2012-07-10T22:24:21.590 回答
2
lis1=[1,2,3,4,5,6,7,8]
num1=lis1[1]
num2=lis1[4]
lis2=[11,12,13,14,2,7,5,34]
if num1 in lis2 and num2 in lis2:
    if lis2.index(num1)>lis2.index(num2):
        #do something here
    else:
        #do something else
于 2012-07-10T22:16:23.683 回答
1

如果我了解您要做什么,这是一种方法:

score={}

Names = ["John", "James", "Barry", "Greg", "Jenny"]
Results1 = ["James", "Barry", "Jenny", "Greg", "John"]
Results2 = ["Barry", "Jenny", "Greg", "James", "John"]

r1dict={name:i for i,name in enumerate(Results1)}
r2dict={name:i for i,name in enumerate(Results2)}

for i, ni in enumerate(Names):
    for j, nj in enumerate(Names):
        if r1dict[ni] > r2dict[nj]:
            score[(i,j)]=1

print(score)  

印刷:

{(0, 1): 1, (3, 2): 1, (4, 4): 1, (3, 3): 1, (2, 2): 1, 
 (4, 2): 1, (0, 3): 1, (0, 4): 1, (3, 4): 1, (0, 2): 1}
于 2012-07-10T22:53:27.490 回答