嵌套循环和列表的克隆

Question

我有一个字典列表

lst = [{"activity":"tx"},{"activity":"fl", "ids":['123','456','789','432']}, {"activity":"ia"}]

我想克隆这些列表并将它们添加到主列表中，其中的数字基于“fl”字典中唯一的“ids”。

期望的结果：

master = [[{"activity":"tx"},{"activity":"fl", "ids":'123'}, {"activity":"ia"}], 
          [{"activity":"tx"},{"activity":"fl", "ids":'456'}, {"activity":"ia"}], 
          [{"activity":"tx"},{"activity":"fl", "ids":'789'}, {"activity":"ia"}], 
          [{"activity":"tx"},{"activity":"fl", "ids":'432'}, {"activity":"ia"}]]

Answer 1

这可以通过 lst[1]['ids']

上的一个简单循环来完成

ans = [[lst[0], {"activity":"fl", "ids": id}, lst[2]] for id in lst[1]['ids']]

print(ans)  
[[{'activity': 'tx'}, {'activity': 'fl', 'ids': '123'}, {'activity': 'ia'}],
 [{'activity': 'tx'}, {'activity': 'fl', 'ids': '456'}, {'activity': 'ia'}],
 [{'activity': 'tx'}, {'activity': 'fl', 'ids': '789'}, {'activity': 'ia'}],
 [{'activity': 'tx'}, {'activity': 'fl', 'ids': '432'}, {'activity': 'ia'}]]

嵌套循环和列表的克隆

Nested loops and cloning of lists

dictionary

copy

cloning

python-3.x