Question

我在使用python数组列表时遇到了一些麻烦。

我知道，python列表应保持其顺序，但我有脚本，这不是真的，我无法确定原因，所以我认为你可以帮助我。

有一些更复杂的脚本，即从CSV文件中获取2行，使用权重获取第一行，命令它们，然后根据第一行重新排序第二行：

csv_cleared = csv.reader(open(temp_csv_file),  delimiter= ';')  
vahy = csv_cleared.next()
vahy_ordered = sorted(vahy, key=int, reverse=True) # orders line
vahy_ordered_indexes = []

for vaha in vahy:
    index_vahy = vahy_ordered.index(vaha)
    if index_vahy in vahy_ordered_indexes:     # if two mats have same weight
        index_vahy = index_vahy+1 # increment index by one
        vahy_ordered_indexes.append(index_vahy)
    else:
        vahy_ordered_indexes.append(index_vahy)

日志：

Vahy: ['49', '3', '19', '8', '19', '39', '11']
Vahy ordered: ['49', '39', '19', '19', '11', '8', '3']
Vaha is: 49 Index_vahy is: 0
Inserted index_vahy: 0 into vahy_ordered_indexes([0])
Vaha is: 3 Index_vahy is: 6
Inserted index_vahy: 6 into vahy_ordered_indexes([0, 6])
Vaha is: 19 Index_vahy is: 2
Inserted index_vahy: 2 into vahy_ordered_indexes([0, 6, 2])
Vaha is: 8 Index_vahy is: 5
Inserted index_vahy: 5 into vahy_ordered_indexes([0, 6, 2, 5])
Vaha is: 19 Index_vahy is: 2
Inserted index_vahy: 3 into vahy_ordered_indexes([0, 6, 2, 5, 3]) DOUBLED!!!
Vaha is: 39 Index_vahy is: 1
Inserted index_vahy: 1 into vahy_ordered_indexes([0, 6, 2, 5, 3, 1])
Vaha is: 11 Index_vahy is: 4
Inserted index_vahy: 4 into vahy_ordered_indexes([0, 6, 2, 5, 3, 1, 4])

这样可以正常工作，但问题会在以后出现：

new_line = line[:3]
line_materials = line[3:-1]
line_material = 0
for poradovnik in vahy_ordered_indexes:
    poradie = poradovnik + 3
    print "Poradie is: %s New line before insert is: %s"% (poradie, new_line)
    print "Inserting material: %s into position: %s" % (line_materials[line_material], poradie)
    new_line.insert(poradie, line_materials[line_material])
    print "New line after insert is: %s \n"% (new_line)
    line_material += 1

其中new_line.insert（）函数插入带有正确索引的项目，但它们的位置不正确，如log：

Poradie is: 3 New line before insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.']
Inserting material: TESCO 5K into position: 3
New line after insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K'] 

Poradie is: 9 New line before insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K']
Inserting material: TESCO expres into position: 9
New line after insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'TESCO expres'] 

Poradie is: 5 New line before insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'TESCO expres']
Inserting material: BILLA hlavny into position: 5
New line after insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'TESCO expres', 'BILLA hlavny'] 

Poradie is: 8 New line before insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'TESCO expres', 'BILLA hlavny']
Inserting material: Ptacek into position: 8
New line after insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'TESCO expres', 'BILLA hlavny', 'Ptacek'] 

Poradie is: 6 New line before insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'TESCO expres', 'BILLA hlavny', 'Ptacek']
Inserting material: Merkury Market SK into position: 6
New line after insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'TESCO expres', 'BILLA hlavny', 'Merkury Market SK', 'Ptacek'] 

Poradie is: 4 New line before insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'TESCO expres', 'BILLA hlavny', 'Merkury Market SK', 'Ptacek']
Inserting material: NAY elektrodom into position: 4
New line after insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'NAY elektrodom', 'TESCO expres', 'BILLA hlavny', 'Merkury Market SK', 'Ptacek'] 

Poradie is: 7 New line before insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'NAY elektrodom', 'TESCO expres', 'BILLA hlavny', 'Merkury Market SK', 'Ptacek']
Inserting material: TOP Farma into position: 7
New line after insert is: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'NAY elektrodom', 'TESCO expres', 'BILLA hlavny', 'TOP Farma', 'Merkury Market SK', 'Ptacek']

似乎在某些情况下，物品被插入正确的位置，而其他情况则没有，但是我被困了几天已经没有找到它何时插入正确的位置而不是

Answer 1

您无法在列表边界外插入项目，例如：

>>> l = [1, 2, 3]
>>> l.insert(10, 10)
>>> l
[1, 2, 3, 10]

将10插入到3的位置，而不是10。

Answer 2

正如安东所说，问题是你要在列表边界之外插入项目。有很多方法可以解决这个问题。这是一种可能的解决方案，将原始索引保持在有序的集合列表中：

vahy = ['49','3','19','8','19','39','11']
indexed_vahy = [(x,y) for x,y in enumerate(vahy)]
ordered_vahy = sorted(indexed_vahy, key=lambda x: int(x[1]), reverse=True)

new_line = ['Kod regionu', 'Nazov regionu', 'Platova kat.']
line_materials = ['TESCO 5K','TESCO expres', 'BILLA hlavny', 'Ptacek', 'Merkury Market', 'NAY elektrodom', 'TOP Farma']
output = new_line

for index, weight in ordered_vahy:
  output.apped(line_material[index])

这就是日志：

Vahy: ['49','3','19','8','19','39','11']
Indexed vahy: [(0, '49'), (1, '3'), (2, '19'), (3, '8'), (4, '19'), (5, '39'), (6, '11')]
Ordered vahy: [(0, '49'), (5, '39'), (2, '19'), (4, '19'), (6, '11'), (3, '8'), (1, '3')]
Output: ['Kod regionu', 'Nazov regionu', 'Platova kat.', 'TESCO 5K', 'NAY elektrodom', 'BILLA hlavny', 'Merkury Market', 'TOP Farma', 'Ptacek', 'TESCO expres']

为什么我的python数组列表不遵循命令？

2 个答案: