Python part4: file open, read lines and find a specific word

find 関数で特定の文字列を含む行をプリントアウトする
for line in f:
 if line.find("line-2") >= 0:

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file-open2.py
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#!/usr/bin/python
f = open ('file-test-1.txt', 'r')
f2 = open ('file-test-2.txt', 'w')

for line in f:
 if line.find("line-2") >= 0:
  f2.write(line)
  print line
#  f2.write(line[:-1])
#print f.read()
f2.write('IAP')
f.close()
f2.close()

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file-test-1.txt
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a,line-1,c
b,line-23,c
c,line-333a,d
a,line-4444,d
c,line-4a3ac,bb,dd
end

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Result
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kurokawa-no-MacBook-Air:Linux taka$ ./file-open2.py
b,line-23,c