Python - 從列表中刪除空列表

-4

我有一個列表中有幾個空列表。我按照這裏的指示（Python: How to remove empty lists from a list?）試圖過濾出空的列表，但失敗了，我真的沒有理由。Python - 從列表中刪除空列表

我的列表：

data: [['#0721', '', '', '', ''], ['', '', '', '', ''], ['', '', '', '', ''], ['GBE COD', '746', '$2.00', '', '$1,492.00'], ['GBW COD', '13,894', '$0.50', '', '$6,947.00'], ['GOM COD', '60', '$2.00', '', '$120.00'], ['GB WINTER FLOUNDER', '94,158', '$0.25', '', '$23,539.50'], ['GOM WINTER FLOUNDER', '3,030', '$0.50', '', '$1,515.00'], ['GBE HADDOCK', '18,479', '$0.02', '', '$369.58'], ['GOM HADDOCK', '0', '$0.02', '', '$0.00'], ['GBW HADDOCK', '110,470', '$0.02', '', '$2,209.40'], ['HAKE', '259', '$1.30', '', '$336.70'], ['PLAICE', '3,738', '$0.40', '', '$1,495.20'], ['POLLOCK', '3,265', '$0.02', '', '$65.30'], ['WITCH FLOUNDER', '1,134', '$1.30', '', '$1,474.20'], ['SNE YT', '1,458', '$0.65', '', '$947.70'], ['GB YT', '4,499', '$0.70', '', '$3,149.30'], ['REDFISH', '841', '$0.02', '', '$16.82'], ['', '', '', '', ''], ['', '', '', '', ''], ['54 DAS @ $8.00/DAY = 432.00', '', ''], ['', '', '', '', '', '', '', '', ''], ['', '', '', '', '', '', '', '', '']]

我的代碼：

data = filter(None, data) 
print("second data:", data) 
data = list(data) 
print("third data:", data)

主要生產：

second data: <filter object at 0x05F23CF0> 
third data: [['#0721', '', '', '', ''], ['', '', '', '', ''], ['', '', '', '', ''], ['GBE COD', '746', '$2.00', '', '$1,492.00'], ['GBW COD', '13,894', '$0.50', '', '$6,947.00'], ['GOM COD', '60', '$2.00', '', '$120.00'], ['GB WINTER FLOUNDER', '94,158', '$0.25', '', '$23,539.50'], ['GOM WINTER FLOUNDER', '3,030', '$0.50', '', '$1,515.00'], ['GBE HADDOCK', '18,479', '$0.02', '', '$369.58'], ['GOM HADDOCK', '0', '$0.02', '', '$0.00'], ['GBW HADDOCK', '110,470', '$0.02', '', '$2,209.40'], ['HAKE', '259', '$1.30', '', '$336.70'], ['PLAICE', '3,738', '$0.40', '', '$1,495.20'], ['POLLOCK', '3,265', '$0.02', '', '$65.30'], ['WITCH FLOUNDER', '1,134', '$1.30', '', '$1,474.20'], ['SNE YT', '1,458', '$0.65', '', '$947.70'], ['GB YT', '4,499', '$0.70', '', '$3,149.30'], ['REDFISH', '841', '$0.02', '', '$16.82'], ['', '', '', '', ''], ['', '', '', '', ''], ['54 DAS @ $8.00/DAY = 432.00', '', ''], ['', '', '', '', '', '', '', '', ''], ['', '', '', '', '', '', '', '', '']]

所以最終沒有做任何事情，這是爲什麼？

來源

2017-06-01 theprowler

我這裏看不到任何空列表。一個包含5個空字符串的列表中仍然有5個東西。 – user2357112

你好。如果您想回答，請在下面添加 - 點擊「回答您的問題」。我們不會將解決方案作爲編輯添加到此處的問題中。 – halfer

如果a_list的任何元素評估爲True，您可以使用any(a_list)，即True，因爲非空字符串。

data = [['#0721', '', '', '', ''], ['', '', '', '', ''], ['', '', '', '', ''], ['GBE COD', '746', '$2.00', '', '$1,492.00'], ['GBW COD', '13,894', '$0.50', '', '$6,947.00'], ['GOM COD', '60', '$2.00', '', '$120.00'], ['GB WINTER FLOUNDER', '94,158', '$0.25', '', '$23,539.50'], ['GOM WINTER FLOUNDER', '3,030', '$0.50', '', '$1,515.00'], ['GBE HADDOCK', '18,479', '$0.02', '', '$369.58'], ['GOM HADDOCK', '0', '$0.02', '', '$0.00'], ['GBW HADDOCK', '110,470', '$0.02', '', '$2,209.40'], ['HAKE', '259', '$1.30', '', '$336.70'], ['PLAICE', '3,738', '$0.40', '', '$1,495.20'], ['POLLOCK', '3,265', '$0.02', '', '$65.30'], ['WITCH FLOUNDER', '1,134', '$1.30', '', '$1,474.20'], ['SNE YT', '1,458', '$0.65', '', '$947.70'], ['GB YT', '4,499', '$0.70', '', '$3,149.30'], ['REDFISH', '841', '$0.02', '', '$16.82'], ['', '', '', '', ''], ['', '', '', '', ''], ['54 DAS @ $8.00/DAY = 432.00', '', ''], ['', '', '', '', '', '', '', '', ''], ['', '', '', '', '', '', '', '', '']] 

non_empty = [sublist for sublist in data if any(sublist)] 
print(non_empty) 

[['#0721', '', '', '', ''], 
['GBE COD', '746', '$2.00', '', '$1,492.00'], 
['GBW COD', '13,894', '$0.50', '', '$6,947.00'], 
['GOM COD', '60', '$2.00', '', '$120.00'], 
['GB WINTER FLOUNDER', '94,158', '$0.25', '', '$23,539.50'], 
['GOM WINTER FLOUNDER', '3,030', '$0.50', '', '$1,515.00'], 
['GBE HADDOCK', '18,479', '$0.02', '', '$369.58'], 
['GOM HADDOCK', '0', '$0.02', '', '$0.00'], 
['GBW HADDOCK', '110,470', '$0.02', '', '$2,209.40'], 
['HAKE', '259', '$1.30', '', '$336.70'], 
['PLAICE', '3,738', '$0.40', '', '$1,495.20'], 
['POLLOCK', '3,265', '$0.02', '', '$65.30'], 
['WITCH FLOUNDER', '1,134', '$1.30', '', '$1,474.20'], 
['SNE YT', '1,458', '$0.65', '', '$947.70'], 
['GB YT', '4,499', '$0.70', '', '$3,149.30'], 
['REDFISH', '841', '$0.02', '', '$16.82'], 
['54 DAS @ $8.00/DAY = 432.00', '', '']]

來源

2017-06-01 17:51:02

這可能是一個愚蠢的問題，但在你的'non_empty'行中，哪些是'1'（'''）和哪個是'L'？ – theprowler

@theprowler我改了名字。 –

哦，好吧，很酷，它完美的作品，謝謝一噸！ – theprowler

由於user2357112指出你沒有空列表，你有字符串''的列表不是空列表。

要解決你的問題，你應該改變你傳遞給過濾器的第一個參數。過濾器（函數，可迭代）將返回一個列表，其中包含來自iterable的值，函數返回true。

在您的情況，請嘗試：

def isEmpty(list): 
    return any(list) 

print filter(isEmpty, data)

來源

2017-06-01 17:58:40

Python - 從列表中刪除空列表

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