给定此文件：
$ cat words.txt
line1 word1 word2
line2 word3 word4
line3 word5 word6
with open('words.txt','r') as f:
for line in f:
for word in line.split():
print(word)
印刷品：
line1
word1
word2
line2
...
word6
同样，如果要将文件拼合为文件中单个单词的平面列表，则可以执行以下操作：
with open('words.txt') as f:
flat_list=[word for line in f for word in line.split()]
>>> flat_list
['line1', 'word1', 'word2', 'line2', 'word3', 'word4', 'line3', 'word5', 'word6']
使用print '\n'.join(flat_list)…可以创建与第一个示例相同的输出
或者，如果要在文件的每一行中嵌套单词列表（例如，从文件创建行和列的矩阵）：
with open('words.txt') as f:
matrix=[line.split() for line in f]
>>> matrix
[['line1', 'word1', 'word2'], ['line2', 'word3', 'word4'], ['line3', 'word5', 'word6']]
如果您想使用正则表达式解决方案，则可以在示例文件中过滤wordN和lineN键入单词：
import re
with open("words.txt") as f:
for line in f:
for word in re.findall(r'\bword\d+', line):
# wordN by wordN with no lineN
或者，如果您希望它成为带有正则表达式的逐行生成器：
with open("words.txt") as f:
(word for line in f for word in re.findall(r'\w+', line))
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