Question

我使用csv导入了5000个最常用单词的列表，我想确保它们都是小写的。我还需要把它变成一组。是否有一种特殊的方法可以做到这一点，因为它可以用来手动完成。但这段代码应该有效吗？

with open("most_common_words.csv", "rU") as csv_file: # Opens the file in a 'closure' so that when it's finished it's automatically closed"
    most_common = csv.reader(csv_file, delimiter = ',', quotechar = '"') # Create a csv reader instance

mcw_set = set(most_common.lower())

谢谢！

Answer 1

这将有效：

with open("most_common_words.csv", "rU") as csv_file:
    most_common = csv.reader(csv_file, delimiter = ',', quotechar = '"')
    mcw_set = set(x[0].lower() for x in most_common)

以下是generator expressions

的参考资料

Answer 2

from itertools import imap
from operator import methodcaller

with open("most_common_words.csv", "rU") as csv_file: # Opens the file in a 'closure' so that when it's finished it's automatically closed"
    most_common = csv.reader(csv_file, delimiter = ',', quotechar = '"') # Create a csv reader instance

mcw_set = set(imap(methodcaller('lower'), most_common))

如何在Python 2.7中创建一个小写集合小写

2 个答案: