pandas 数据框中列表中的小写句子

Question

我有一个如下所示的熊猫数据框。我想将所有文本转换为小写。我怎样才能在Python中做到这一点？

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数据框样本

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我尝试过的

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def toLowercase(fullCorpus):\n   lowerCased = [sentences.lower()for sentences in fullCorpus['sentTokenized']]\n   return lowerCased\n

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我收到这个错误

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lowerCased = [sentences.lower()for sentences in fullCorpus['sentTokenized']]\nAttributeError: 'list' object has no attribute 'lower'\n

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Answer 1

这很容易：

df.applymap(str.lower)

或者

df['col'].apply(str.lower)
df['col'].map(str.lower)

好的，您已经有了按行排列的列表。然后：

df['col'].map(lambda x: list(map(str.lower, x)))