在Pandas中，如何获取包含列表的序列的值\u counts（）

In [79]: df.files Out[79]: 0 [{'url': 'http://www.apkmirror.com/wp-content/... 1 [{'url': 'http://www.apkmirror.com/wp-content/... 2 [{'url': 'http://www.apkmirror.com/wp-content/... 3 [{'url': 'http://www.apkmirror.com/wp-content/... 4 [{'url': 'http://www.apkmirror.com/wp-content/... 5 [{'url': 'http://www.apkmirror.com/wp-content/... 6 [{'url': 'http://www.apkmirror.com/wp-content/... 7 [{'url': 'http://www.apkmirror.com/wp-content/... 8 [{'url': 'http://www.apkmirror.com/wp-content/... 9 [{'url': 'http://www.apkmirror.com/wp-content/... 10 [{'url': 'http://www.apkmirror.com/wp-content/... 11 [{'url': 'http://www.apkmirror.com/wp-content/... 12 [{'url': 'http://www.apkmirror.com/wp-content/... 13 [{'url': 'http://www.apkmirror.com/wp-content/... 14 [{'url': 'http://www.apkmirror.com/wp-content/... 15 [{'url': 'http://www.apkmirror.com/wp-content/... 16 [{'url': 'http://www.apkmirror.com/wp-content/... 17 [{'url': 'http://www.apkmirror.com/wp-content/... 18 [{'url': 'http://www.apkmirror.com/wp-content/... 19 [{'url': 'http://www.apkmirror.com/wp-content/... 20 [{'url': 'http://www.apkmirror.com/wp-content/... 21 [{'url': 'http://www.apkmirror.com/wp-content/... 22 [{'url': 'http://www.apkmirror.com/wp-content/... 23 [{'url': 'http://www.apkmirror.com/wp-content/... 24 [{'url': 'http://www.apkmirror.com/wp-content/... 25 [{'url': 'http://www.apkmirror.com/wp-content/... 26 [{'url': 'http://www.apkmirror.com/wp-content/... 27 [{'url': 'http://www.apkmirror.com/wp-content/... 28 [{'url': 'http://www.apkmirror.com/wp-content/... 29 [{'url': 'http://www.apkmirror.com/wp-content/... ... 16487 [{'url': 'http://www.apkmirror.com/wp-content/... 16488 [] 16489 [{'url': 'http://www.apkmirror.com/wp-content/... 16490 [{'url': 'http://www.apkmirror.com/wp-content/... 16491 [] 16492 [{'url': 'http://www.apkmirror.com/wp-content/... 16493 [{'url': 'http://www.apkmirror.com/wp-content/... 16494 [{'url': 'http://www.apkmirror.com/wp-content/... 16495 [] 16496 [] 16497 [] 16498 [{'url': 'http://www.apkmirror.com/wp-content/... 16499 [{'url': 'http://www.apkmirror.com/wp-content/... 16500 [{'url': 'http://www.apkmirror.com/wp-content/... 16501 [{'url': 'http://www.apkmirror.com/wp-content/... 16502 [{'url': 'http://www.apkmirror.com/wp-content/... 16503 [] 16504 [] 16505 [] 16506 [] 16507 [] 16508 [] 16509 [] 16510 [] 16511 [] 16512 [] 16513 [] 16514 [] 16515 [] 16516 []

3条回答

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1楼 · 编辑于 2024-05-03 18:59:39

如果你在寻找空列表，为什么要使用value\u counts？在

len([i for i in df.files if len(i) == 0])

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2楼 · 编辑于 2024-05-03 18:59:39

如果要使用^{}，可以先转换为tuple：

vc = df.files.apply(tuple).value_counts()

但是如果只需要空的length的话，lists使用^{}作为计数lists，那么sum所有True的布尔掩码：

^{pr2}$

如果没有NaNs值，请使用IanS solution：

l = (df['files'].apply(len) == 0).sum()

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3楼 · 编辑于 2024-05-03 18:59:39

您也可以编写for循环来遍历列表：

for i in df.files:
    count = 0
    if len(i) == 0:
        count = count + 1
    else:
        pass

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