Python file comparison

Environment:

python2.6.6

Linux Systems

Compare file differences with the Difflib module in Python:

Python comes with a difflib module without installation.

Compare two files is the general idea is: Read the contents of the file and then compare

Symbol	Meaning
+	Contained in the second sequence, but does not contain the first sequence in a
-	Contained in the first sequence, but not in the second sequence
？	Flag two sequence rows with delta differences
^	Flag two sequence existence difference character
‘‘	Two sequence lines consistent

Example one:

#!/usr/bin/python#coding:utf-8#2017,8,27import difflibtext1= ' 1234567890this is a text One.heihiehie ' text1_line= Text1.splitlines () #以行进行分割 so that later contrast text2= ' 235678956545This is a Text Two.heiheihei ' Text2_line=text2.splitlines () d = Difflib. Differ () #创建Differ () object diff = d. Compare (text1_line,text2_line) print ' \ n '. Join (List (diff))

Look at the results of the operation:

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are symbols, the symbols are not good to distinguish, the next generation of HTML files.

Example two:

#!/usr/bin/python#coding:utf-8#2017,8,27import difflibtext1= ' 1234567890this is a text One.heihiehie ' text1_line= Text1.splitlines () #以行进行分割 so that later contrast text2= ' 235678956545This is a Text Two.heiheihei ' Text2_line=text2.splitlines () d = Difflib. Htmldiff () #创建Differ () object print D.make_file (text1_line,text2_line)

Execute command to generate diff.html file

[email protected] difflib]# python diff_simple2.py >> diff.html

To open diff.html file in a browser:

650) this.width=650; "src=" Https://s3.51cto.com/wyfs02/M02/A4/A1/wKioL1muoECAgp_5AAAZWMKBH6g864.png "title=" 1.png "alt=" Wkiol1muoecagp_5aaazwmkbh6g864.png "/>

That would be a lot more beautiful.

Comprehensive applications, comparing the differences between two files:

#!/usr/bin/python#-*-coding:utf-8-*-#2017.9.5import difflibimport sys# receive Parameters try:textfile1=sys.argv[1] textfile2=sys.argv[2]except exception,e:print  "Error:" +str (e) print  "Usage:python contrast_ File.py filename1 filename2 >> diff.html "Sys.exit () #读取文件函数def   readfile ( FileName): Try:filehandle = open (filename,  ' RB ') Text = filehandle.read (). Splitlines () Filehandle.close () return textexcept ioerror as error:print  "Read file error : "+str (Error) Sys.exit () #判断接收的是否为空if   (textfile1 == " " or textfile2==" "):p rint " Usage:python contrast_file.py filename1 filename2 >> diff.html " sys.exit () #调用函数获取分割后的字符串text1_lines  = readfile (textfile1)   text2_lines = readfile ( Textfile2) #创建html类对象, and compare. Diff = difflib. Htmldiff () print diff.make_file (Text1_lines,text2_lines)

Execute the command to generate the diff2.html file, with the browser open as in example two.

[[email protected] difflib]# python contrast_file.py httpd.conf httpd.conf.bak >> diff2.html

Reference: Network and Python automation operations technology and best practices

Summary: The idea is very important, this document comparison of the idea is to first read out the document, in contrast. Make a little progress every day.

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This article from "Tiandaochouqin" blog, declined reprint!

Python file comparison