python - 如何将具有多个值的字典写入 CSV？

Question

我有一本看起来像这样的字典

{ 1: ['apple', 'orange'],
  2: ['fennel', 'basil', 'bay leaves'],
  3: ['almonds', 'walnuts']}

我正在尝试将其导出为 CSV 并使表格如下所示:

list_id    list_items
1           apple
1           orange
2           fennel
2           basil
2           bay leaves
3           almonds
3           walnuts

我不知道该怎么做的主要事情是如何解析字典中的多个值，以便我有单独的行。我研究过 csv.writerow() 但文档不是很有帮助，因此非常感谢示例!

Answer 1

循环遍历字典键/值，然后循环遍历值:

import csv

D = { 1: ['apple', 'orange'],
      2: ['fennel', 'basil', 'bay leaves'],
      3: ['almonds', 'walnuts']}

# with open('out.csv','w',newline='') as f:  # Python 3
with open('out.csv','wb') as f:              # Python 2
    w = csv.writer(f)
    w.writerow(['list_id','list_items'])
    for key,items in D.items():
        for item in items:
            w.writerow([key,item])