[英]make list from text file and compare the lists
full.txt包含:
www.example.com/a.jpg
www.example.com/b.jpg
www.example.com/k.jpg
www.example.com/n.jpg
www.example.com/x.jpg
partial.txt包含:
a.jpg
k.jpg
为什么以下代码无法提供预期的结果?
with open ('full.txt', 'r') as infile:
lines_full=[line for line in infile]
with open ('partial.txt', 'r') as infile:
lines_partial=[line for line in infile]
with open ('remaining.txt', 'w') as outfile:
for element in lines_full:
if element[16:21] not in lines_partial: #element[16:21] means like a.jpg
outfile.write (element)
所需的剩余.txt应具有完全位于部分.txt中的完全.txt元素,如下所示:
www.example.com/b.jpg
www.example.com/n.jpg
www.example.com/x.jpg
此代码将在每行末尾包含换行符,这意味着它将永远不会与"a.jpg"
或"k.jpg"
精确匹配。
with open ('partial.txt', 'r') as infile:
lines_partial=[line for line in infile]
更改为
with open ('partial.txt', 'r') as infile:
lines_partial=[line[:-1] for line in infile]
删除换行符( line[:-1]
意思是“没有该行的最后一个字符”)
您可以使用os.path库:
from os import path
with open ('full.txt', 'r') as f:
lines_full = f.read().splitlines()
with open ('partial.txt', 'r') as f:
lines_partial = set(f.read().splitlines()) # create set for faster checking
lines_new = [x + '\n' for x in lines_full if path.split(x)[1] not in lines_partial]
with open('remaining.txt', 'w') as f:
f.writelines(lines_new)
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