Get SVN diff and summarise added/removed/changed function definitions

svn_diff_defs.py

#!/bin/env python
"""get svn diff and compare added functions to removed functions, 
command line args passed through to svn diff, e.g. use -r nnn:nnn to filter a specific revision."""

import sys, subprocess, re
from collections import defaultdict

svn_diff = subprocess.Popen(['svn', 'diff'] + sys.argv[1:], stdout=subprocess.PIPE).communicate()[0]

defn1 = "\W((?:def|class)\s+\w+)[:\(]" # python def and class
defn2 = "\W(function(?:\s+\w+)?)\("    # javascript function
is_defn = re.compile('(?:%s)|(?:%s)' % (defn1, defn2))

new, old = defaultdict(list), defaultdict(list)
for line in svn_diff.split("\n"):
    if line[:3] in ('---', '+++'):
        continue
    for defn in is_defn.findall(line):
        defn = defn[0] or defn[1] # two groupings in the pattern, pick whichever one matched
        if line[0] == '-':
            old[defn].append(line[1:].strip())
        if line[0] == '+':
            new[defn].append(line[1:].strip())
            
added, removed, changed = [], [], []
for defn in new.keys():
    if defn in old:
        # convert to a single string so they stay together when sorted 
        changes = "".join(["\t%s\n"%line for line in old[defn]]
                          + ["\t %s\n"%(line.replace(defn, '-'*(len(defn)-3)+'> ')) for line in new[defn]])
        changed.append(changes[1:-1]) # strip off initial tab & trailing new line
    else:
        added.extend(new[defn])
for defn in old.keys():
    if not defn in new:
        removed.extend(old[defn])

for title, lines in (("Added:", added), ("Changed:", changed), ("Removed:", removed)):
    if lines:
        print title
        print "".join('\t%s\n'%line for line in sorted(lines))
    else:
        print title, 'none.'

Could you please add some pictures, so we can get the code clearly and easily,
I want get the function like "beyond compare", when I input the two path, I can get the diff code like beyond compare,
Could you please give me some suggestion?
thank you,