[英]Python create list from a list of lists of dictionaries
我有一個list
,其中包含有關ZIP的信息(它們的位置,大小ect)的信息,該列表稱為enclosures
。
該列表使用以下代碼創建:
for item in g.entries:
enclosure = [l for l in item["links"] if l["rel"] == "enclosure"]
if(len(enclosure)>0):
enclosures.append(enclosure)
列表enclosures
中的每一項都有以下格式:
>>> enclosures[0]
[{'type': 'application/zip', 'rel': 'enclosure', 'length': '57648', 'href': 'http://www.sec.gov/Archives/edgar/data/37748/000003774810000025/0000037748-10-000025-xbrl.zip'}]
或另一個例子
>>> enclosures[45]
[{'type': 'application/zip', 'rel': 'enclosure', 'length': '107907', 'href': 'http://www.sec.gov/Archives/edgar/data/1385157/000104746910004400/0001047469-10-004400-xbrl.zip'}]
我需要創建一個名為href
的enclosures list
,該 enclosures list
以相同的順序包含enclosures list
中的每個href
項目。
下面的這些嘗試均失敗。
>>> enclosures[46]["href"]
Traceback (most recent call last):
File "<pyshell#66>", line 1, in <module>
enclosures[46]["href"]
TypeError: list indices must be integers, not str
>>> enclosures[46][4]
Traceback (most recent call last):
File "<pyshell#67>", line 1, in <module>
enclosures[46][4]
IndexError: list index out of range
編輯
親愛的timgeb
我有這個結果:
>>> href = [x['href'] for x in enclosures]
Traceback (most recent call last):
File "<pyshell#75>", line 1, in <module>
href = [x['href'] for x in enclosures]
File "<pyshell#75>", line 1, in <listcomp>
href = [x['href'] for x in enclosures]
TypeError: list indices must be integers, not str
href = [x[0]['href'] for x in enclosures]
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