Question

给定两个文本文件A，B，在B中不存在B中行的行号的简单方法是什么？我看到有difflib，但没有看到用于检索行号的接口

Answer 1

difflib可以满足您的需求。假设：

<强> A.TXT

this 
is 
a 
bunch 
of 
lines

<强> b.txt

this 
is 
a 
different
bunch 
of 
other
lines

像这样的代码：

import difflib

fileA = open("a.txt", "rt").readlines()
fileB = open("b.txt", "rt").readlines()

d = difflib.Differ()
diffs = d.compare(fileA, fileB)
lineNum = 0

for line in diffs:
   # split off the code
   code = line[:2]
   # if the  line is in both files or just b, increment the line number.
   if code in ("  ", "+ "):
      lineNum += 1
   # if this line is only in b, print the line number and the text on the line
   if code == "+ ":
      print "%d: %s" % (lineNum, line[2:].strip())

输出如下：

bgporter@varese ~/temp:python diffy.py 
4: different
7: other

您还需要查看difflib代码"? "并查看您希望如何处理该代码。

（另外，在实际代码中，您希望使用上下文管理器来确保文件被关闭等等）

Answer 2

穷人的解决方案：

with open('A.txt') as f:
    linesA = f.readlines()

with open('B.txt') as f:
    linesB = f.readlines()

print [k for k, v in enumerate(linesB) if not v in linesA]

获取已更改的行号

2 个答案: