file1：
Hello
People
of
the
world
file2：
Hello
People
from
India

import difflib
with open('file1') as f1:
    f1_text = f1.read()
with open('file2') as f2:
    f2_text = f2.read()
# 查找并打印差异：
for line in difflib.unified_diff(f1_text, f2_text, fromfile='file1', tofile='file2', lineterm=''):
    print line

--- file1
+++ file2
@@ -1,5 +1,4 @@
 Hello
 People
-of
-the
-world
+from
+India