python 使用 lambda 和 map 从字典列表中删除键/值
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Deleting key/value from list of dictionaries using lambda and map
提问by webley
I have a list of dictionaries that have the same keys within eg:
我有一个字典列表，其中包含相同的键，例如：
[{k1:'foo', k2:'bar', k3...k4....}, {k1:'foo2', k2:'bar2', k3...k4....}, ....]
I'm trying to delete k1 from all dictionaries within the list.
我正在尝试从列表中的所有词典中删除 k1。
I tried
我试过
map(lambda x: del x['k1'], list)
but that gave me a syntax error. Where have I gone wrong?
但这给了我一个语法错误。我哪里错了？
回答by Ned Batchelder
lambda bodies are only expressions, not statements like del.
lambda 主体只是表达式，而不是像del.
If you haveto use map and lambda, then:
如果必须使用 map 和 lambda，则：
map(lambda d: d.pop('k1'), list_of_d)
A for loop is probably clearer:
for 循环可能更清楚：
for d in list_of_d:
del d['k1']
