从 Python 3.x 中的另一个列表中删除单独的项目列表
Removing separate list of items from another list in Python 3.x
我有一个列表，其中包含很多带标签的双字母组。有些二元组没有正确标记，所以我想将它们从主列表中删除。双字母组中的一个单词经常重复，所以我可以删除包含 xyz 单词的双字母组。 Psudo 示例如下：
master_list = ['this is', 'is a', 'a sample', 'sample word', 'sample text', 'this book', 'a car', 'literary text', 'new book', 'them about', 'on the' , 'in that', 'tagged corpus', 'on top', 'a car', 'an orange', 'the book', 'them what', 'then how']
unwanted_words = ['this', 'is', 'a', 'on', 'in', 'an', 'the', 'them']
new_list = [item for item in master_list if not [x for x in unwanted_words] in item]
我可以单独删除这些项目，即每次我创建一个列表并删除包含单词的项目，比如 'on'。这很乏味，需要数小时的过滤和创建新列表来过滤每个不需要的词。我认为循环会有所帮助。但是，我收到以下类型错误：
Traceback (most recent call last):
File "<pyshell#21>", line 1, in <module>
new_list = [item for item in master_list if not [x for x in unwanted_words] in item]
File "<pyshell#21>", line 1, in <listcomp>
new_list = [item for item in master_list if not [x for x in unwanted_words] in item]
TypeError: 'in <string>' requires string as left operand, not list
非常感谢您的帮助！
您的条件 if not [x for x in unwanted_words] in item 与 if not unwanted_words in item 相同，即您正在检查 list 是否包含在 string.
相反，您可以使用 any 检查二元语法的任何部分是否在 unwanted_words 中。此外，您可以将 unwanted_words 设为 set 以加快查找速度。
>>> master_list = ['this is', 'is a', 'a sample', 'sample word', 'sample text', 'this book', 'a car', 'literary text', 'new book', 'them about', 'on the' , 'in that', 'tagged corpus', 'on top', 'a car', 'an orange', 'the book', 'them what', 'then how']
>>> unwanted_words = set(['this', 'is', 'a', 'on', 'in', 'an', 'the', 'them'])
>>> [item for item in master_list if not any(x in unwanted_words for x in item.split())]
['sample word', 'sample text', 'literary text', 'new book', 'tagged corpus', 'then how']
我有一个列表，其中包含很多带标签的双字母组。有些二元组没有正确标记，所以我想将它们从主列表中删除。双字母组中的一个单词经常重复，所以我可以删除包含 xyz 单词的双字母组。 Psudo 示例如下：
master_list = ['this is', 'is a', 'a sample', 'sample word', 'sample text', 'this book', 'a car', 'literary text', 'new book', 'them about', 'on the' , 'in that', 'tagged corpus', 'on top', 'a car', 'an orange', 'the book', 'them what', 'then how']
unwanted_words = ['this', 'is', 'a', 'on', 'in', 'an', 'the', 'them']
new_list = [item for item in master_list if not [x for x in unwanted_words] in item]
我可以单独删除这些项目，即每次我创建一个列表并删除包含单词的项目，比如 'on'。这很乏味，需要数小时的过滤和创建新列表来过滤每个不需要的词。我认为循环会有所帮助。但是，我收到以下类型错误：
Traceback (most recent call last):
File "<pyshell#21>", line 1, in <module>
new_list = [item for item in master_list if not [x for x in unwanted_words] in item]
File "<pyshell#21>", line 1, in <listcomp>
new_list = [item for item in master_list if not [x for x in unwanted_words] in item]
TypeError: 'in <string>' requires string as left operand, not list
非常感谢您的帮助！
您的条件 if not [x for x in unwanted_words] in item 与 if not unwanted_words in item 相同，即您正在检查 list 是否包含在 string.
相反，您可以使用 any 检查二元语法的任何部分是否在 unwanted_words 中。此外，您可以将 unwanted_words 设为 set 以加快查找速度。
>>> master_list = ['this is', 'is a', 'a sample', 'sample word', 'sample text', 'this book', 'a car', 'literary text', 'new book', 'them about', 'on the' , 'in that', 'tagged corpus', 'on top', 'a car', 'an orange', 'the book', 'them what', 'then how']
>>> unwanted_words = set(['this', 'is', 'a', 'on', 'in', 'an', 'the', 'them'])
>>> [item for item in master_list if not any(x in unwanted_words for x in item.split())]
['sample word', 'sample text', 'literary text', 'new book', 'tagged corpus', 'then how']