比较python中的两个文件忽略比较注释行

Question

I have below test files

testfile1 output:

   put returns between paragraphs
   for linebreak add 2 spaces at end
   indent code by 4 spaces

testfile2 output:

   put returns between paragraphs
   for linebreak add 2 spaces at end
   indent code by 4 spaces
   #commented out

I want to compare two files and print only difference output. If any comments in start of line ignore to compare those line.

Below is code i tried:

import difflib

with open('testfile1') as text1, open('testfile2') as text2:
    diff = difflib.ndiff(text1.readlines(), text2.readlines())
with open('diff.txt', 'w') as result:
    for line in diff:
        result.write(line)

output:

 put returns between paragraphs
 for linebreak add 2 spaces at end
 indent code by 4 spaces
+ #commented

Expected output:

 put returns between paragraphs
 for linebreak add 2 spaces at end
 indent code by 4 spaces

and print "No changes"

Answer 1

I would eliminate the # -marked lines using a list comprehension:

...
with open('testfile1') as text1, open('testfile2') as text2:
    diff = difflib.ndiff(
        [line for line in text1 if not line.startswith('#')],
        [line for line in text2 if not line.startswith('#')]
        )
...