Python的 - 拉平不規則列表

Question

我怎麼壓扁這個名單：

irr_list = [[[u'Animal Collective'], u'Lion in a Coma'], [[u'Animal Collective'], u'Hocus Pocus'], [[u'Animal Collective'], u'Vertical'], [[u'Animal Collective'], u'Natural Selection'], [[u'Animal Collective'], u'Spilling Guts'], [[u'Animal Collective'], u'Recycling']] 

這種期望的輸出？

output = [[u'Animal Collective', u'Lion in a Coma'], [u'Animal Collective', u'Hocus Pocus'], [u'Animal Collective', u'Vertical'], [u'Animal Collective', u'Natural Selection'], [u'Animal Collective', u'Spilling Guts'], [u'Animal Collective', u'Recycling']] 

我曾嘗試：

flattened = [val for sublist in irr_list for val in sublist] 

無濟於事

Answer 1

如果您的列表始終是形式[[list, element], [list, element], ...]的，那麼你可以用一個列表理解

output = [[l[0], e] for l, e in irr_list] 

Answer 2

你可以試試這個：

import itertools 

new_data = [list(itertools.chain.from_iterable([[b] if not isinstance(b, list) else b for b in i])) for i in irr_list] 

輸出：

[[u'Animal Collective', u'Lion in a Coma'], [u'Animal Collective', u'Hocus Pocus'], [u'Animal Collective', u'Vertical'], [u'Animal Collective', u'Natural Selection'], [u'Animal Collective', u'Spilling Guts'], [u'Animal Collective', u'Recycling']]